Engineering Standard

SAES-G-005 14 March 2017

Centrifugal Pumps
Document Responsibility: Pumps, Seals, and Mixers Standards Committee

Contents
1 Scope ..................................................................... 2
2 Conflicts and Deviations ......................................... 2
3 References ............................................................. 2
4 Design .................................................................... 5
5 Installation ............................................................ 25
6 Testing and Inspection ......................................... 27
7 Life Cycle Cost Evaluation ................................... 28
Revision Summary ...................................................... 29

Table 1 - Mechanical Seal Selection Guide ................ 30

Table 2 - Pump Metallurgy Application Guide ............. 44
Table 3 - Test Requirements for Centrifugal Pumps ... 46
Appendix A - Centrifugal Pump Selection Guide ......... 47
Appendix B - Typical Drawing of
Bleed Bushing Design ...................................... 50
Appendix C - Minimum Flow
Recycle Requirement Guide ............................ 51
Appendix D - Terms and Definitions ........................... 53

Previous Issue: 13 July 2014 Next Planned Update: 14 March 2020

Page 1 of 54
Contact: Ghamdi, Abdullah Ali (ghamaa3g) on phone +966-13-8809507

©Saudi Aramco 2017. All rights reserved.

Document Responsibility: Pumps, Seals, and Mixers Standards Committee SAES-G-005
Issue Date: 14 March 2017
Next Planned Update: 14 March 2020 Centrifugal Pumps

1 Scope

This standard defines the minimum mandatory requirements governing the design and
installation of centrifugal pumps excluding submersible pumps that are covered by
SAES-G-007, Submersible Pumps and Motors for Water Well and Offshore Service.

Pumps in domestic sewage or community water service with driver power rating up to
37 kW (50 HP) shall be to manufacturer standard design and do not have to comply
with this standard.

This standard may not be attached to or made a part of purchase orders.

2 Conflicts and Deviations

2.1 Any conflicts between this standard and other applicable Saudi Aramco
Engineering Standards (SAESs), Materials System Specifications (SAMSSs),
Standard Drawings (SASDs), or industry standards, codes and forms shall be
resolved in writing by the Company or Buyer Representative through the
Manager, Consulting Services Department of Saudi Aramco, Dhahran.

2.2 Direct all requests to deviate from this standard in writing to the Company or
Buyer Representative, who shall follow internal company procedure SAEP-302
and forward such requests to the Manager, Consulting Services Department of
Saudi Aramco, Dhahran.

3 References

The selection of material and equipment and the design, construction, maintenance and
repair of equipment and facilities covered by this standard shall comply with the latest
edition of the references listed below, unless otherwise noted.

3.1 Saudi Aramco References

Saudi Aramco Engineering Procedures

SAEP-302 Instructions for Obtaining a Waiver of a Mandatory
Saudi Aramco Engineering Requirement
SAEP-341 Equipment Life Cycle Cost Procedure

Saudi Aramco Engineering Standards

SAES-B-009 Fire Protection and Safety Requirements for
Offshore Production Facilities
SAES-B-017 Firewater System Design
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SAES-B-068 Electrical Area Classification

SAES-L-310 Design of Plant Piping

Saudi Aramco Materials System Specifications

17-SAMSS-503 Severe Duty Totally Enclosed Squirrel Cage
Induction Motors to 500 HP
30-SAMSS-001 Diesel Engines
31-SAMSS-004 Centrifugal Pumps
31-SAMSS-012 Shaft Sealing System for Centrifugal and Rotary
Pumps
31-SAMSS-685 Sealless Centrifugal Pumps
32-SAMSS-009 General Purpose Steam Turbines
32-SAMSS-013 Lubrication, Shaft Sealing, and Control Oil Systems

Saudi Aramco Standard Drawing

AD-036821-001 Material Guide for Centrifugal Pumps (Sheet1:
Horizontal and Vertical In-Line Pumps)
AD-036821-002 Material Guide for Centrifugal Pumps (Sheet2:
Vertical Suspended Pumps)

Saudi Aramco Forms and Data Sheets

SA-2741 & Centrifugal Pump Data Sheet for Horizontal
SA-2741-M Pumps and Vertical In-Line Pumps
SA-2745 & Sealless Centrifugal Pump Data Sheet for
SA-2745-M Horizontal Pumps and Vertical In-Line Pumps
SA-2748 & Centrifugal Pump Data Sheet for Vertical
SA-2748-M Suspended Pumps
SA-7305 Equipment Noise Data Sheet
Form LCC-001 Life Cycle Cost Spread Sheet for Centrifugal Pumps
Form LCC-002 Life Cycle Cost Spread Sheet for Centrifugal
Pump/Motor Trains

Saudi Aramco Inspection Requirements

Form 175-310500 Pumps: ASME Centrifugal, Horizontal, End Suction
Single Stage, or Vertical In-Line
Form 175-310510 Molten Sulfur Pumps: Centrifugal, Horizontal and
Vertical
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Form 175-310520 Pumps: ASME/ISO or Manufacturer Standard

Sealless
Form 175-310700 Main Firewater Pumps: Centrifugal, Horizontal
and Vertical

3.2 Industry Codes and Standards

American Petroleum Institute

API STD 610 Centrifugal Pumps for Petroleum, Petrochemical
and Natural Gas Industries
API STD 682 Shaft Sealing Systems for Centrifugal and Rotary
Pumps
API RP 686 Recommended Practices for Machinery Installation
and Installation Design

American Society of Mechanical Engineers

ASME B1.1 Unified Inch Screw Threads
ASME B1.13M Metric Screw Threads: M Profile
ASME B73.1 Specification for Horizontal, End Suction
Centrifugal Pumps for Chemical Process
ASME B73.2 Specification for Vertical In-Line Centrifugal Pumps
for Chemical Process
ASME B73.3 Specification for Sealless Horizontal, End Suction
Metallic Centrifugal Pumps for Chemical
Process

Institute of Electrical and Electronics Engineers, Inc.

IEEE 252 Standard Test Procedure for Polyphase Induction
Motors Having Liquid in the Magnetic Gap

International Standards Organization

ISO 2858 End-Suction Centrifugal Pumps (Rating 16 Bar)
ISO 5199 Technical Specification for Centrifugal Pumps -
Class II
ISO 15783 Seal-less Rotodynamic Pump-Class II Specification
NACE MR0175/ISO 15156 Petroleum and Natural Gas Industries
Materials for Use in H2S-containing
Environments in Oil and Gas Production

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ISO 12944 Paints and Varnishes - Corrosion Protection of

Steel Structures by Protective Paint Systems

National Fire Protection Association

NFPA 20 Standard for the Installation of Stationary Pumps
for Fire Protection

Hydraulic Institute Standard

HI 9.6.7 Viscosity Correction
HI 14.6 Rotodynamic Pumps for Hydraulic Performance
Acceptance Tests

4 Design

4.1 Pump Type Selection

4.1.1 Pump Selection Guide

Refer to Appendix A for pump selection based on services.

4.1.1.1 Main firewater pumps shall comply with the hydraulic

and operating requirements of NFPA 20 and SAES-B-017
or SAES-B-009. All main firewater pumps shall not exceed
1,800 RPM. Horizontal jockey pumps may operate at
3,600 RPM. Vertically suspended jockey pumps shall not
exceed 1,800 RPM unless approved by the Standards
Committee Chairman; Pumps, Seals, and Mixers.
Firewater pumps do not require FM or UL listing.

Horizontal and vertical inline jockey pumps shall comply

with ASME B73.1, B73.2 or ISO 2858 and ISO 5199.
Vertical suspended jockey pumps and all jockey pumps for
non-industrial services may be of manufacturer standard
design.

4.1.1.2 For new sump installations and for replacement of existing

pumps in a non-flammable hydrocarbon applications,
horizontal direct drive self-priming pumps shall be used for
open sump services when suction lift (vertical distance between
the pump centerline and low-low liquid level in the sump) does
not exceed 6 m (20 ft). Self-priming pumps shall not be used
in flammable hydrocarbon applications.

Sump pumps in storm water applications shall be vertical

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suspended of the discharge through column design such as VS1

and VS2 pump type.

Automatic air release valve or continuous bleed with orifice

shall be provided upstream the check valve in the discharge
piping of self-priming pumps.

Vendor mechanical seal selection is acceptable for self-priming

pumps and may not comply with Table 1 - Mechanical Seal
Selection Guide of this standard.

Self-priming pumps that will be on stand-by mode for extended

period of time shall be provided with continuous priming
system to avoid losing the priming fluid from the pump suction
chamber.

If self-priming pumps are selected for application where they

are running continuously or frequently, a connection line with
orifice and a block valve shall be provided between the
discharge of the two pumps (the operating and the standby
pump) upstream the check valves to ensure that the standby
pump is always primed.

Vertically suspended pumps are acceptable only for cases

where suction lift exceeds 6 m (20 ft) or flow rate, discharge
pressure or NPSH is beyond the operating range of
self-priming pumps.
Note: If the first stage of vertical suspended pumps is always
submerged (i.e., below minimum liquid level), this pump
design is not considered to have suction lift.

When vertically suspended pumps are used for hydrocarbon

and oily water open sump applications, they shall be of the
discharge through column design such as VS1 and VS2 pump
type. Separate discharge pump design, such as VS4 and VS5
pump type, is not acceptable for these applications.

For bulk plants and tank farms where the dewatering of

flammable liquid tanks is directed to the oily water sump
(i.e., no closed drain system), the use of self-priming pumps
and side discharge vertical suspended pumps are not acceptable
( i.e. not allowed in flammable oily water). In such case,
vertically suspended pumps of the discharge through column
design such as VS1 and VS2 pump type in accordance with
31-SAMSS-04 shall be used. The pump shall have a
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Next Planned Update: 14 March 2020 Centrifugal Pumps

mechanical seal and non-metallic bushings and wear rings.

All non-metallic parts in the pump and the seal shall be MTBE
compatible if gasoline is drained into the collection sump.

4.1.1.3 For vertically suspended pumps, an open lineshaft shall be used

if the distance between the normal liquid level and the
centerline of the pump discharge nozzle is 15.3 m (50 ft) or
less. Applications exceeding this shall utilize an enclosed
lineshaft. Alternatively, consideration shall be given to the use
of electric submersible pumps complying with 31-SAMSS-010
andSAES-G-007.

4.1.1.4 Maximum operating speed of vertically suspended pumps

(including vertical cantilever type with suction tail pipe) shall
not exceed 1,800 RPM unless approved by the Standards
Committee Chairman; Pumps, Seals, and Mixers.

4.1.1.5 Non-metallic pumps may be used when the maximum

discharge pressure does not exceed 1,040 kPa gauge (150 psig)
and the pump driver rating does not exceed 37 kW (50 HP)
unless approved by the Standards Committee Chairman;
Pumps, Seals, and Mixers.

4.1.1.6 Sealless pumps shall be limited to motor nameplate rating of

225 kW (300 HP) unless approved by the Standards Committee
Chairman; Pumps, Seals, and Mixers.

Sealless pumps, or pumps with dual pressurized seals, shall be

provided for highly hazardous services as defined in Appendix
D.

For applications where the motor rating exceeds 225 kW

(300 HP) or where sealless pumps are not suitable for the
service, sealed pumps with Arrangement 3 (dual pressurized
seals) shall be used as per Table 1 highly hazardous liquids.

Alternative pump designs or seal selection can be accepted

subject to the review and concurrence of the Standards
Committee Chairman; Pumps, Seals and Mixers.

All horizontal sealless pumps shall be self-venting and shall be

designed to permit complete drainage of the primary pressure
casing prior to dismantling.

Sealless pumps in open drain, closed drain, blowdown and

knockout drum applications shall be equipped with an external
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flush, self-cleaning filter or cyclone separator to provide clean

flush for the drive side of the pump. This requirement shall
also be applicable to any service where there is a potential of
having high suspended solids continuously on intermittently.

4.1.1.6.1 The below paragraphs shall be applicable for

Canned Motor Pumps in accordance with
ASME B73.3 or ISO 15783
a) Secondary containment is required for canned
motor pumps.
b) The operating speed of canned motor pumps
shall not exceed 3,600 RPM unless approved
by the Standards Committee Chairman;
Pumps, Seals, and Mixers.
c) Stator housing and liner hydrostatic tests are
required for each pump. The test pressure
shall be the pump MAWP.
d) Bearing wear detector or shaft position sensor
shall be provided unless the pump is fitted
with ceramic type bearing faces such as solid
silicon carbide.
e) The following protection instrumentation shall
be provided for canned motor pumps:
i- Leakage detection in pump stator.
ii- High and low pump power monitoring or
flow monitoring.
iii- Motor winding temperature.

Alternative recommended manufacturer

instrumentation can be accepted subject to the
review and concurrence of the Standards
Committee Chairman; Pumps, Seals, and
Mixers.
Note: when the pump is equipped with shutdown
trip signal that will result in major plant
upset, an automated startup shall be
considered for the standby pump.

4.1.1.6.2 The below paragraphs shall be applicable for

Magnetic Drive End Suction Pumps (Synchronous
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or Eddy Current), in accordance with ASME B73.3

or ISO 15783
a) The operating speed of magnetic drive sealless
pumps shall not exceed 3,600 RPM.
b) The synchronous magnet torque rating shall
exceed the maximum torque of the pump with
maximum diameter impeller from minimum
continuous stable capacity to 120% of rated
capacity by the following factors, based on the
calculated torque of the coupling. For molten
sulfur application, the factor shall be 1.5 for all
calculated torque values:

Calculated Calculated Synchronous

Torque Torque Coupling
Nm ft-lbf Rating Factor
<50 <37 1.25
50 - 150 37 - 111 1.15
>150 >111 1.10

c) The eddy magnetic coupling torque rating

shall exceed the maximum torque rating of the
pump with maximum diameter impeller from
minimum continuous stable capacity to 120%
of rated capacity by a minimum of 10%.
d) If two or more synchronous magnetic drive
pumps on the same purchase order and of
identical type, rating, materials and design
conditions are presented for inspection as a
batch, a static torque test on one pump is
acceptable. Otherwise, a static torque test is
required for each pump.
e) Non-metallic material containment shells are
allowed subject that manufacturer provides
sufficient experience for two pumps in similar
service with equivalent or higher power rating,
pressure, and temperature.
f) The following instrumentation shall be
provided for magnetic drive pumps:

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i- Leakage detection in secondary pressure

casing.
ii- Metallic containment shell temperature
monitoring.
iii- High and low pump power monitoring or
flow monitoring.

Alternative recommended manufacturer

instrumentation can be accepted subject to the
review and concurrence of the Standards
Committee Chairman; Pumps, Seals, and
Mixers.
Note: when the pump is equipped with shutdown
trip signal that will result in major plant
upset, an automated startup shall be
considered for the standby pump.

g) Close coupled magnetic drive sealless pumps

are acceptable up to 3.7 kW (5 HP) driver
rating.
h) Magnetic drive pumps shall have secondary
leakage control systems designed to meet the
maximum pressure seen by the containment
shell when the pump is in operation.

4.1.1.6.3 The below spare parts shall be provided for sealless

pumps as part of the pumps purchase order.
A common spare for multiple services shall be used
whenever possible.
a) For Canned Motor pumps meeting
31-SAMSS-685 in continuous operation, an
additional pump shall be provided as a
warehouse spare. When multiple services are
having identical pumps, a single common
warehouse spare pump shall be provided.
b) For 31-SAMSS-685 Canned Motor pumps in
intermittent operation and for all ASME/ISO
Canned Motor pumps, a common set of wear
rings, bearings, auxiliary impeller, gaskets,
shims, and O-rings shall be provided.

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c) For 31-SAMSS-685 magnetic drive pumps in

continuous operation, a common set of the
following spare parts shall be provided:
1. Containment shell
2. Rub rings
3. Rotor assembly set which consists of
bearing sleeves and bushings, inner magnet
and all rotating parts except the impeller.
4. Drive rotor set which consists of the outer
magnet assembly, drive shaft and all
attached rotating parts including bearings
and shaft seals.
5. Wear rings, auxiliary impeller, gaskets,
shims and O-rings.
d) For 31-SAMSS-685 magnetic drive pumps in
intermittent operation and for all ASME/ISO
magnetic drive pumps, the following spare
parts shall be provided:
1. Containment shell
2. Rub rings
3. Antifriction bearings (front and rear)
4. Shaft seal (front and rear)
5. Wear rings, product lubricated bearings,
auxiliary impeller, gaskets, shims and
O-rings.

4.1.1.7 The pump and its drive train including all auxiliaries shall
comply with the requirements of SAES-B-068, Electrical Area
Classification.

4.1.1.8 Horizontal single stage overhung having driver nameplate

rating exceeding 225 kW (300 HP) or having rated flow
exceeding 600 m³/hr (2,640 gpm) is not acceptable unless
approved by the StandardS Committee Chairman; Pumps,
Seals, and Mixers.

4.1.1.9 Hydraulic power recovery turbines in reverse osmosis services

are not required to comply with 31-SAMSS-004.

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4.1.1.10 Driving vertical pumps through right angle gearbox is not

acceptable except for diesel driven pumps in water well or
firewater services.

4.1.1.11 All pumps, including sealless pumps, shall be designed for a

minimum suspended solids of 0.03% (300 PPM) by weight
unless a higher number is specified in the datasheet.

4.1.1.12 Belt driven pumps are not allowed.

4.1.1.13 Integrally geared pump with driver rated power above 200 HP
requires review and approval by the Standards Committee
Chairman; Pumps, Seals, and Mixers.

4.1.1.14 Vertically suspended pumps in sulfur application shall have a

closed impeller design unless approval by the Standards
Committee Chairman; Pumps, Seals, and Mixers.

4.1.2 Unit responsibility for the complete pump train including driver, gear, oil
system(s), etc., shall be assigned to the pump manufacturer.
Exception:

Exception may be made when the driver is a special purpose steam

turbine or combustion gas turbine.

4.1.3 Noise Control

4.1.3.1 For each new piece of equipment or integrated unit that will
generate noise in excess of 85 dB(A) at a distance of one
meter, the Project Manager shall submit a completed Form
SA-7305, Equipment Noise Data Sheet, to ECD/EPD.

4.1.3.2 New equipment shall not generate noise in excess of 90 dB(A)

at a distance of one meter after engineering controls have been
implemented. If the noise level will exceed this limit, the
Project Manager shall submit a completed Form SA-7305,
Equipment Noise Data Sheet, to ECD/EPD, and shall obtain a
waiver in accordance with SAEP-302.

4.2 Rated Operating Conditions

4.2.1 The NPSHA at 120% of rated flow shall be determined based on suction
pressure at pump suction nozzle and pumped product vapor pressure at
maximum pumping temperature. If strainers are used for long-term
basis, the maximum pressure drop across the strainer shall be included in

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the NPSHA calculations. Permanent strainers shall have a differential

pressure transmitter to activate alarm on high differential pressure.

4.2.2 Viscosity correction factors, per the Hydraulic Institute Standard HI 9.6.7,
shall be applied. Extrapolation is not recommended. Correction factors
for water are 1:1:1. Limitations on use of viscous liquid performance
correction chart are:
a) Use only for pumps of conventional hydraulic design, in the normal
operating range, with open or closed impellers. DO NOT use for
mixed flow or axial flow pumps or for pumps of special hydraulic
design for either viscous or non-uniform liquids.
b) Use only on Newtonian (uniform) liquids. Gels, slurries and other
non-uniform liquids may produce widely varying results,
depending on the particular characteristics of the liquids.

4.2.3 Rated suction pressure shall be the minimum suction pressure expected
under all operating conditions.

4.3 Hydraulic Performance

4.3.1 All pumps shall have continuous head rise from the rated head to shutoff.

Unless approved by the Standards Committee Chairman; Pumps, Seals,

and Mixers, the head rise shall not be less than 10% of the rated for:
a) Pumps operating in parallel.
b) Individually operated pumps on a statically dominated system
resistance curve (more than 50% of required head is due to static
resistance).

Unless approved by the Standards Committee Chairman; Pumps, Seals,

and Mixers, the head rise shall not be less than 6% of the rated head for
individually running pumps on friction dominated system resistance
curve (more than 50% of required head is due to friction resistance).

For ASME and ISO pumps and pumps to manufacturer's standard

design, integrated orifice in the casing might be used to achieve the
required head rise.

4.3.2 For all pumps, the NPSH3 shall not exceed the specified NPSHA over
the range of minimum continuous stable capacity to 120% of the rated
capacity. At rated capacity, the NPSHA shall also exceed the NPSH3 by
a minimum margin of 1 meter (3.3 ft). For variable speed pumps, the

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above NPSH requirements apply for all speeds required to meet the
specified operating conditions.

4.3.3 Vertical main firewater pumps shall have sufficient submergence and
NPSH to allow operating at 150% of the rated flow under the worst case
operating conditions (lowest water level and highest water temperature).

4.3.4 For all pumps, with exception of integrally geared, the suction specific
speed, based on the NPSH required for 3% first stage head drop at best
efficiency capacity, shall not exceed 12,000 in U.S. units. Higher values
maybe accepted with proven experience for at least 3 years of operation at
similar operating conditions such as NPSH margins and percentage of
operating point to BEP. Acceptance of higher values requires the approval
of the Standard Committee Chairman; Pumps, Seals, and Mixers.

4.3.5 For pumps with rated power per stage up to 300 HP, the cut water
clearance shall be at least 3% of the rated impeller blade radius for
diffuser designs and at least 6% of the rated impeller blade radius for
volute designs.

For all pumps with rated power per stage exceeding 300 HP, the radial
clearance between the diffuser vane or volute tongue (cut water) and the
periphery of the rated impeller blade shall be at least 4% of the rated
impeller blade radius for diffuser designs and at least 8% of the rated
impeller blade radius for volute designs.

Pumps with smaller clearances require the approval of the Standards

Committee Chairman; Pumps, Seals and Mixers. For such cases, the
following shall be submitted for review:
a) Vendor reference of at least two identical pumps having clearance
similar to the proposed clearance and are operating at similar
operating conditions.
b) The referenced pump cut water clearance.
c) The referenced pump operating conditions and vibration data,
including vibration at vane-pass frequency for rated flow, minimum
flow and 120% of rated flow.
d) The user contact information of the referenced pump.

Multiphase pumps are excluded from the above requirement.

4.3.6 Main firewater pumps shall have closed impellers. The minimum
internal dimensions of impeller passages shall not be less than 7.9 mm
(5/16 inch) for pumps rated up to 1,892 L/min (500 gpm) or 12.7 mm
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(0.5 inch) for larger flow pumps.

4.3.7 Unless approved by the Standards Committee Chairman; Pumps, Seals,

and Mixers, the pump efficiency at rated point shall not be less than the
efficiency value ( Pɳ ) calculated as per the following equation:
−0.21
𝑄 2300 2
𝑃𝜂 = 0.88 − 0.09 × [ ] − 0.29 × [𝑙𝑜𝑔10 ( )]
𝑁 𝑁𝑠

𝑁𝑠 6000 800 2
− 0.125 × 𝐸𝑋𝑃 (1 − ) − 0.012 × ×[ ]
450 𝑁 𝑁𝑠
Where:
Q: is rated flow in GPM. For double suction impeller use full flow
per impeller (not per eye).
N: is shaft speed in revolution per minute RPM.
Ns: Specific speed (using GPM, feet & RPM). For multistage
pumps where the Ns is different for a number of stages, the
weighted average of specific speeds of the stages shall be used.

The following pumps are exempted from the above minimum efficiency
requirement:
i- Pumps with rated power of less than 37 kW (50 HP).
ii- Sealless pumps.
iii- Multiphase pumps.
iv- Pumps that operate for less than 10% of the time such as main fire
water pumps and storm water pumps.

4.3.8 Pump sizing

Unless approved by the Standards Committee Chairman; Pumps, Seals,

and Mixers, the pump datasheet normal and rated flow shall meet the
below requirements:

4.3.8.1 Normal flow (normal operating point) shall be based on the

flow rate stated in the PFD heat and material balance under
normal operating case where the pump will operate most of its
time (i.e., dominant operating case).

If there are more than one dominant operating case with more
than 10% change in flow rate (excluding temporary conditions
such as partial turndown during T&I’s), then the highest

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normal flow shall be filled in the datasheet’s operating

conditions section and the lowest normal flow shall be stated in
the datasheet note section.

The normal flow for all dominant operating cases shall meet
the following:
i- For ASME, ISO, and manufacturer standard pumps, the
lowest normal flow shall not be less than 60% of the pump
BEP.
ii- For pumps complying with 31-SAMSS-004 and
31-SAMSS-685, the lowest normal flow shall be within the
preferred operating region of the pump (70% to 120% of
Best Efficiency Point)

4.3.8.2 The pump rated flow shall not be more than 110% of normal
flow point (i.e., 10% flow margin) except for recycle pump
applications, such as reflux or circulation pumps, which can be
have up to 20% margin above normal flow.

4.3.8.3 For ASME and ISO pumps and pumps to manufacturer's

standard design, the normal and rated capacity shall not be less
than 60% and shall not exceed 110% of the capacity at best
efficiency point. In addition, the minimum continuous stable
capacity shall not exceed 50% of the rated capacity.

4.4 Casing Design

4.4.1 The maximum allowable working pressure (MAWP) shall be based on

the maximum specified relative density with:
 Maximum impeller diameter at rated speed for constant speed
applications.
 Rated impeller diameter at maximum speed for variable speed
applications.

The MAWP of horizontal and vertical in-line pump casings and the
discharge heads of vertically suspended pumps shall be at least equal to
the sum of the maximum suction pressure and the differential pressure
developed at shut-off.

The MAWP of the bowl and column assemblies of vertical suspended

pumps shall be at least equal to the maximum differential pressure
developed by the bowl assembly at shut-off.

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4.4.2 Casing design temperature shall be at least equal to the maximum flow
temperature. For pumps handling liquids which may auto-refrigerate,
the minimum design temperature shall be the lowest liquid temperature
which would occur as a result of rapid reduction in liquid pressure to
25% of the pump design operating pressure.

4.4.3 The details of threading shall be in accordance with ASME B1.1,

ASME B1.13M or other internationally approved standard.

4.5 Shaft Sealing

4.5.1 Seal Codes and Applications

4.5.1.1 Mechanical seals shall be in accordance with Table 1 of this

standard with the exception of self-priming pumps.
Mechanical seals of manufacturer standard design are
acceptable for horizontal self-priming.

Mechanical seals shall be in accordance with 31-SAMSS-012

for the following pumps:
a) Pumps complying with 31-SAMSS-004, with the
exception of integrally geared pumps.
b) ASME and ISO pumps in hazardous, flammable or toxic
service.

Mechanical seals shall be in accordance with Table 1 of

this standard for following pumps (but do not need to meet
31-SAMSS-012):
a) ASME and ISO pumps not in hazardous, flammable or
toxic service.
b) Pumps to manufacturer's standard design, with the
exception of self-priming pumps.
c) Overhung pitot tube pumps (rotating casing pump designs)

The seal codes used in Table 1 of this standard are based on

API STD 682 terminology. Refer to Appendix D.

4.5.1.2 Mechanical seal selections for services not listed in the

Mechanical Seal Selection Guide are subject to the review and
approval of the Standards Committee Chairman; Pumps, Seals,
and Mixers.

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4.5.1.3 Packing is required for horizontal and vertical main firewater

pumps and for non-hydrocarbon slurry pumps. Horizontal
firewater pumps shall have drain hole at the bottom of the
bearing bracket and shall not be less than 25 mm (1 inch) in
diameter. Horizontal and vertical inline jockey pumps shall
have mechanical seals.

4.5.1.4 With the exception of main firewater pumps, vertically

suspended pumps with discharge through column design in
non-flammable oily water, raw water, storm water, or sea water
service, shall be provided with a bleed type discharge head
bushing, deflector ring and a labyrinth seal. Refer to Appendix
B of this standard for a typical drawing of bleed type design.
Proposed designs differing from the typical drawing, including
mechanical seal or packing, require the approval of the
Standards Committee Chairman; Pumps, Seals, and Mixers.

For flammable oily water sump, such as in bulk plants and tank
farms, vertical suspended pumps shall have mechanical seals.

4.5.2 Mechanical Seal Piping Plans

For all pumps, the piping for mechanical seal flush, quench, vent, drain
and leakage detection system shall be in accordance with Table 1,
Mechanical Seal Selection Guide. The seal leakage systems, when
required by service conditions, shall be included in the scope of supply
of the pump Vendor unless otherwise specified.

To avoid contamination with pumped product, suitable barrier fluid shall

be selected for Arrangement 3 seals.

4.6 Bearings and Bearing Housings

4.6.1 Bearings shall be oil lubricated unless exempt from the scope of
31-SAMSS-004, 31-SAMSS-685, ASME or ISO. Anti-friction bearings
of pumps exempt from these specifications may be grease lubricated.
Horizontal main firewater pumps with antifriction bearings shall be
grease lubricated. With the exception of pumps having external lube oil
system, the following shall be installed on the bearing housings of oil
lubricated pumps:
 Constant level oiler
 Level sight glass
 A drainable sight glass (installed under the bearing housing to drain
condensed water from the bearing housing).
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 Unused drains on bearing housing shall have magnetic drain plugs.

4.6.2 The upthrust and downthrust values for vertical pumps quoted by the
Vendor shall be the maximum forces expected at any point over the
entire range of the pump performance curve.

It shall be verified that the values listed are within the bearing design
criteria of the driver or transmission unit which absorbs the rotor thrust.

4.6.3 When bearing housing vibration limits are not specified in the applicable
specifications for the pumps, bearing vibration shall not exceed 5.1
mm/sec (0.2 inch/sec RMS) when measured in both radial directions and
in axial direction and while operating at the rated operating point.

4.6.4 When bearing temperature limits are not specified in the applicable
specifications for the pumps, bearing temperature shall not exceed 85°C
(185°F) based on maximum ambient temperature of 50°C (122°F).
If bearing metal temperature monitoring is not practical, the sump oil
temperature rise shall not exceed 35°C (63°F).

4.7 Materials of Construction

4.7.1 The metallurgy application guide of Table 2 provides a listing of most

liquids pumped. The liquid pumped shall be identified from the table
together with the corresponding “Materials Code(s).” The applicable
material code shall be specified on the Data Sheet(s) SA-2741 &
SA-2741-M/ SA-2745 & SA-2745-M/ SA-2748 & SA-2748-M.

ASTM Standard numbers and material grades offered shall be in

compliance with (or be superior to) the applicable ASTM Standard
numbers and material grades listed on Standard Drawing AD-036821.

To enable the manufacturer to complete the required material

designations, Standard Drawing AD-036821 must be attached to the
Quotation Request or Purchase Order.

Substitute equivalent or superior materials shall be reviewed and

approved in writing by the Standards Committee Chairman; Pumps,
Seals, and Mixers. For any requested materials substitution, sufficient
data shall be provided by the Vendor to justify the substitution.
This data shall include, but shall not be limited, to physical, mechanical
and corrosion resistance properties.

4.7.2 Materials of construction for fluids not listed in Table 2 may be based on
information provided in publications, recommendations provided by
pump manufacturers, Saudi Aramco piping material selection, or other
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accepted sources. In such cases, the proposed material selection shall be

reviewed and approved in writing by the Standards Committee
Chairman; Pumps, Seals, and Mixers.

4.7.3 Materials exposed to sour environment shall be in accordance with the

requirements of NACE MR0175/ISO 15156.

4.8 Couplings and Guards

4.8.1 Lubricated couplings are not permitted.

4.8.2 For horizontal pumps, vertical in-line and vertically suspended pumps
having thrust bearings and not driven by reciprocating engines, flexible
disc pack or diaphragm type couplings are required.

4.8.3 Rigid adjustable spacer type couplings are required for vertical in-line
and vertically suspended pumps not having thrust bearings.

4.8.4 Elastomeric type couplings or couplings having comparable torsional

stiffness are required for pumps driven by reciprocating engines and for
pumps in frequent on and off operation such as loading and unloading
pumps at bulk plants. The elastomeric members shall not deteriorate due
to exposure to a hydrocarbon environment.

4.8.5 Coupling guards shall have provisions to permit inspection of flexible

elements. All coupling guards for pumps in hydrocarbon service shall be
of a non-sparking material such as aluminum or brass. If totally
enclosed coupling guard is provided, drain connection shall be provided
for the coupling guard.

4.9 Drivers

4.9.1 The drivers for ASME and ISO pumps and for pumps to manufacturer's
standard design shall be sized in accordance with the following table:

Driver Nameplate Rating

Minimum Percentage
kW HP
of Pump Rated Power
<22 <30 125
22-55 30-75 115
>55 >75 110

4.9.2 For ASME, ISO pumps and pumps to manufacturer's standard design,
electric motor drivers shall be in accordance with 17-SAMSS-503, diesel

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engines shall be in accordance with 30-SAMSS-001 and steam turbine

drivers shall be in accordance with 32-SAMSS-009.

4.9.3 Main firewater pump drivers shall have a minimum of 5% power margin
over pump required power at 150% of rated flow

4.9.4 Motors for vertical firewater pumps shall be equipped with non-reverse
ratchet. Vertical firewater pumps driven through right angle gearbox
shall have the non-reverse ratchet in the gearbox.

4.10 Mounting Plates

4.10.1 Horizontal Pumps

A baseplate is required for grouted, permanently installed equipment.

An oil field skid is required for equipment which may be temporarily
used for the specified service or frequently relocated. The baseplate
shall extend under the pump and drive train components. To minimize
damage during shipment, all auxiliary piping and instrumentation shall
not extend outside the baseplate perimeter.

4.10.2 Vertical Pumps

Sump mounted vertical pumps shall be provided with a grouted,

permanently installed soleplate or surface plate to which the mounting
plate or flange of the pump will attach. Removal of the pump for
maintenance shall not require removal of the grouted soleplate or
surface plate. Studs shall be installed in the soleplate or surface plate
to match the pump mounting plate or flange. The only exception to
this requirement is when sump pumps are mounted on a steel sump
cover plate. In this case, the sump cover plate shall have studs
installed to match the pump mounting plate or flange. Bolts may be
used instead of studs for the sump cover plate if provided with a
minimum of two guide rods.

4.11 Auxiliary Piping

The scope of the pump vendor shall be limited to the piping within the confines
of the baseplate such as the drain and vent piping.

Unless otherwise approved by the Standards Committee Chairman; Pumps,

Seals, and Mixers, the auxiliary piping for ASME, ISO, and manufacturer's
standard pumps shall meet the below requirements:

4.11.1 The Vendor shall be responsible for the design of all auxiliary piping,
within the scope of the purchasing contract. Compliance with the
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provisions of this specification does not relieve the Vendor from the
responsibilities for furnishing equipment of proper design and quality
to meet the specified operating service conditions.

4.11.2 Sizes, materials, pressure ratings and types of all components shall be
suitable for the intended service. The minimum size of auxiliary
piping and tubing shall be ½-inch.

4.11.3 All piping, tubing and valves shall be adequately supported and
fastened in a manner which facilitates replacement, prevents vibration,
and damage due to incidental loads which may occur during operation
or maintenance work.

4.11.4 The piping and fitting materials for the auxiliary piping shall comply
with Standard Drawing AD-036821. Alternative materials shall be
sent for the review and approval of the Standards Committee
Chairman; Pumps, Seals, and Mixers. Materials in sour services shall
be in accordance with NACE MR0175/ISO 15156.

4.11.5 For pumps in hazardous, flammable or toxic service, the pump casing
vent and drain piping shall be provided and shall have a block valves
immediately after the casing connection flange to reduce dead leg
length. If this location is not practical due to space limitation or other
reasons, the valves may be moved to the nearest possible location to
the casing. The valve material shall be as required for the service but
as a minimum shall be similar to the auxiliary piping material.
Valves shall be in accordance with API STD 602 Class 800 or
ASME B16.34 with rating as required.
Note: Self-venting pumps do not require vent piping.

4.11.6 Piping of 1-½ inch NPS or smaller shall be provided with firm, welded
gussets or braces in two perpendicular planes at the take-off connection
between the machinery or auxiliary equipment and the first block
(root) valve. Tubing shall be clipped with clamps.

4.11.7 All piping systems shall be provided with vent valves at highest points
and drain valves at lowest points. Horizontal pipe runs shall slope
gradually towards drain points. The minimum slope of drain lines
shall be at least 1:50.

4.11.8 Unions are permitted downstream of the isolation valve in

non-pressurized lines such as lines directed to gravity sewer.
Use of any unions in pressurized lines requires the approval
from the Standards Committee Chairman; Pumps, Seals, and Mixers.

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4.11.9 Tubing is not allowed for auxiliary process piping (i.e., auxiliary
piping that is subjected to process fluid). Tubing is permitted only for
instrumentation piping. Instrumentation piping and tubing shall be per
34-SAMSS-831.

Tubing may be used instead of pipe beyond the first valve in non-
process auxiliary piping if the following conditions are met:
i. The maximum allowable pressure and temperature limits for
tubing are 4 MPa (600 psig) and 120°C.
ii. Minimum wall thickness for ½, ¾ and 1-inch tubing are 1.6, 2.4,
and 2.8 mm respectively.
iii. Tubing is not allowed for mechanicals seal piping and for low
temperature applications below -18°C.
iv. Connectors and adapters shall be compression type meeting
UNS S-31600 and ASTM A276.

4.11.10 Flanges, socket welding and threaded fittings shall be of the class,
rating or wall thickness to match the pipe ratings. Threaded
connections are only permitted for instrumentation connection and
mechanical seal gland plate unless approved by Standards Committee
Chairman; Pumps, Seals, and Mixers.

If the use of threaded connections was approved, it shall be held to

minimum and shall be seal welded (except for instruments and
mechanical seal gland connections) for the following:
i. General hydrocarbon
ii. Other flammable fluids under pressure
iii. Hazardous or toxic fluids
iv. Steam at pressures over 1,700 kPa (250 psig) or temperatures
over 210°C.

Threaded connections shall conform to ASME B1.20.1 Pipe Threads.

4.11.11 Auxiliary piping such as vent, drain, external flush and cooling water
piping shall be routed to or near the edge of the baseplate and shall
terminate with flanged connections.

4.11.12 Pipe bends shall have surfaces free of cracks and buckles. Flattening
of the cross section of bends shall not exceed 8% of the nominal pipe
diameter. Bending procedures and heat treatment requirements shall
be in accordance with ASME B31.3.
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4.11.13 Welding procedures and welders shall be qualified in accordance with

the provisions of ASME SEC IX of the Boiler and Pressure Vessel
Code. All welding procedures and welding performance qualification
records shall be made available to Buyer's Inspector for review.

4.11.14 Hydrostatic testing with water or light oil is required for all fabricated
piping assemblies. Test pressures shall be in accordance with
ASME B31.3.

4.11.15 The minimum wall thickness of auxiliary piping and butt welding
fittings shall be Schedule 40 for sizes larger than 2-inch and
Schedule 80 for sizes 2-inch and smaller.

4.11.16 All welds must meet the minimum quality requirements of

ASME B31.3 together with the following additional requirements:
a) For pipe sizes 2 inch and smaller the first pass of butt welded
joints shall be made with Gas Tungsten Arc Welding (GTAW)
process.
b) Permanent backing rings are prohibited, but consumable inserts of
the same chemistry as the remaining weld metal may be used.

4.11.17 Seal welds on threaded connections shall cover all exposed threads
after the joint has been tightened to full thread engagement. The fillet
seal weld shall have a minimum throat thickness of 3 mm and shall
merge smoothly into the pipe metal outside of the thread. Threaded
joints to be seal welded shall be fully cleaned and made up dry without
joint compounds or PTFE (Teflon) tape.

4.11.18 Dissimilar metal welds between ferritic steel and either austenitic
stainless steel, duplex stainless steel, or nickel-based alloys as well as
use of stainless steel or nickel-based filler metals on ferritic steel are
not permitted for pressure containing welds in sour service.

4.11.19 Brackets and supports welded on the mechanical equipment or on the

baseplate shall have full length welds. Intermittent welding is prohibited.
Brackets material shall be selected to prevent galvanic corrosion.

4.11.20 Gaskets for raised flanges shall be spiral-wound, Type 316 stainless
steel. Gaskets for ring joint flanges shall be soft iron octagonal ring.
Gaskets containing asbestos are not permitted.

4.11.21 Shop fabricated piping shall be cleaned internally prior to installing on

the mechanical equipment and prior to mechanical or performance
testing. All piping shall be completely drained and dried.

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4.11.22 Piping which cannot be installed on the mechanical equipment during

transport for reasons of space or risk of damage shall be packed in a
wooden box or crate and shall be shipped together with the mechanical
equipment.

4.11.23 For hazardous, toxic or flammable service, the design of auxiliary

piping shall conform to ASME B31.3. In addition, butt-welds shall be
subjected to 10% random radiographic examination. However, a
minimum of two girth welds shall be radiographed, regardless of the
lot size. One hundred percent radiography, instead of 10%, is required
for auxiliary piping on offshore platforms.

4.12 Vertical firewater pumps shall be provided with suction strainer. The strainer
shall have an open area of at least 400% of the minimum inlet area to the first
stage. The strainer openings shall not permit the passage of 7.9 mm (5/16 inch)
sphere for pumps rated up to 1,892 L/min (500 gpm) or 12.7 mm (0.5 inch)
sphere for larger flow pumps. The distance between the bottom of the strainer
and the bottom of the wet pit should be one-half of the pump bowl diameter but
not less than 12 in. (305 mm).

4.13 Pitot tube pumps (rotating casing pump designs) shall meet the below requirements:
a. As a minimum, the Pick-up tube material shall be martensitic precipitation
hardening stainless steels 17-4PH. 17Cr4Ni ASTM A564 (DIN 1.4549)
grade 630 AISI 630 H1150M, with hardness from 260 to 310 BHN.
b. The pump shall have permanent duplex filter with 100 mesh and a
differential pressure transmitter to alarm on high differential pressure
c. Maximum pump speed shall not exceed 5,000 RPM unless approved by the
Standards Committee Chairman; Pumps, Seals, and Mixers

4.14 Manufacturer standard for external coating is acceptable provided that vendor
coating is suitable for environmental conditions of the site. As a minimum, the
coating system shall be equivalent to ISO 12944-5, corrosion category C5-M for
offshore and C4 for onshore. The primer binder shall be epoxy or Ethyl silicate.

5 Installation

5.1 Layout

5.1.1 Pumps shall be located for convenience of operation and maintenance

requirements. The pump train arrangement shall ensure safe and easy
access to all equipment train components for operation and maintenance
purposes.

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5.1.2 Provisions for isolation, venting and draining the pump shall be installed
to permit internal inspection, repair or dismantling.

5.1.3 Wherever possible, when more than one identical pump train is required,
the design of the equipment trains, the auxiliary baseplate(s), the
connecting piping, cabling, wiring, etc., shall be identical in layout,
construction, and accessibility.

5.2 Suction and Discharge Piping

5.2.1 Suction and discharge piping shall be in accordance with SAES-L-310,

Design of Plant Piping.

5.2.2 Horizontal suction pipe part of self-priming pump shall be designed to be

as short as possible.

5.2.3 A permanent flushing line shall be added on water injection pump

discharge line to flush the pump internals with low salinity water
whenever the pump shuts down.
Note: This line is not intended to provide a continuous flush but rather an
infrequent flushing to reduce the potential for scaling and corrosion
when the pump is on standby.

5.3 Minimum Flow Recycle System

5.3.1 A minimum flow recycle line shall be provided in line with Appendix C.
The use of pressure measurement instead of flow measurement for pump
flow protection is not acceptable unless approved by the Standards
Committee Chairman; Pumps, Seals, and Mixers.

5.3.2 For pumps with common recycle line, the recycle line shall be connected
to the pump discharge piping downstream of the check valves (i.e., on
the main discharge header). Where protection against reverse flow from
the discharge header to the recycle line is required, another check valve
shall be installed on the discharge header downstream of the recycle line
take-off connection.

For pumps with individual recycle line, the recycle lines shall be
connected to the pump discharge piping upstream of the check valve.
Flow element for the minimum flow recycle system, shall measure the
flow in the discharge piping upstream of the recycle line take off
connection.

5.3.3 Recycle lines shall be directed back to the suction source. If this is not
possible, the recycle lines may be connected back to the suction line if
the recycled liquid is cooled down to allow continuous operation at full
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minimum flow recycle mode where all the pumped liquid is recycled.
Except for intermediate pipeline pumping stations, directing the recycle
line to suction line requires the approval of the Standards Committee
Chairman; Pumps, Seals, and Mixers.

5.4 The Vendor's General Arrangement (G.A.) or outline drawings shall include all
required data including nozzles, shaft centerline and baseplate foundation bolt
coordinates to install the pump on its foundation. G.A. drawings shall also show
Buyer's references and the main rating data of equipment components.

5.5 Pump units shall be installed in accordance with API RP 686.

5.6 Variable speed high energy pumps, as defined in 31-SAMSS-004, shall have
high flow protection alarm with variable set point based on pump speed.
The alarm shall activate when the pump flow reaches above 120% of best
efficiency point flow of the corresponding operating speed curve.

5.7 For between bearing pumps in high temperature applications and when a warm-
up is recommended by pump manufacturer, the warm up line shall be provided.
The warm up line shall be connected to the pump casing bottom unless approved
by Standards Committee Chairman; Pumps, Seals, and Mixers.

6 Testing and Inspection

6.1 Pumps requiring testing per Table 3 of this standard shall be tested within 3%
of the rated speed. If this is not feasible, the Vendor shall advise and justify
his proposed vibration acceptance criteria at his specified de-rated speed.
Test speed beyond the 3% limit requires the approval of the Standards
Committee Chairman; Pumps, Seals, and Mixers. Vibration data and bearing
temperatures shall be recorded.

6.2 Requirements on hydrostatic pressure testing, running, and performance testing

shall be completed in accordance with the Test Requirements for Centrifugal
Pumps, paragraph 6.5 below.

6.3 Pumps shall be dismantled to investigate the cause of any unsatisfactory

performance, NPSH or running tests.

6.4 Vibration and temperature measurements shall be taken and recorded for all
certified or witnessed tests of pumps complying with 31-SAMSS-004,
31-SAMSS-685, ASME, and ISO pumps and pumps in firewater and molten
sulfur services.

6.5 Requirements for documentation, certification and witnessing of tests shall be as

specified on Inspection Form 175-310600 for pumps complying to 31-SAMSS-004,

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175-310620 for pumps complying to 31-SAMSS-685, Inspection Form 175-310500

for ASME and ISO pumps, Inspection Form 175-310520 ASME, ISO and
manufacturer standard sealless pumps, Inspection Form 175-310700 for main
firewater pumps, Inspection Form 175-310800 for helico-axial multiphase pumps
and Inspection Form 175-310510 for molten sulfur pumps.

6.6 Sump model testing shall be conducted for all sea water intake systems unless
specifically waived by the Standards Committee Chairman; Pumps, Seals, and
Mixers.

6.7 Additional Testing Requirements for Main Firewater Pumps

6.7.1 Pump tests shall be conducted in accordance to HI 14.6. Test speed shall
be done at rated speed (±4% speed deviation is permitted).

6.7.2 NPSH3 test shall be conducted on at least three points; minimum flow,
rated flow and on 150% of rated flow. For horizontal pumps, NPSH3 at
150% of rated flow shall not exceed 5.8 m (19 ft). For vertical pumps,
the minimum submergence test may be used in lieu of NPSH test if it is
more restrictive (i.e., pump performance will drop due to minimum
submergence requirement before any drop of pump performance due to
low NPSH margin).

6.7.3 Performance test shall be conducted on at least five points including

shutoff, rated flow and 150% of rated flow.

6.7.4 Hydrostatic test shall be performed for at least 5 minutes to a pressure of

twice the maximum allowable working pressure (MAWP), or 2,758 kPa
gauge (400 psig), whichever is greater.

7 Life Cycle Cost Evaluation

Unless otherwise approved by the Standards Committee Chairman; Pumps, Seals, and
Mixers, quotations for pumps and pump-motor trains of 373 kW (500 HP) and larger that
are in accordance with 31-SAMSS-004 (with the exception of pumps in storm water and
firewater services) shall be evaluated on the basis of a Life Cycle Cost (LCC) as
explained in SAEP-341. This cost is composed of initial cost of the pump plus the
present worth of the consumed power cost over an operating period of 20 years, using an
Evaluation Factor (EF), which should be shown in the data sheet that goes with the
quotation request. The Life Cycle Cost of the pump shall be determined using the life
cycle cost spreadsheet LCC-001. The Life Cycle Cost of the pump-motor trains shall be
determined using the life cycle cost spreadsheet LCC-002.
Note: Normal operating point shall be specified on the data sheet. Pump power at normal
operating point shall be specified by the pump manufacturer on the data sheet and
performance curve.
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Revision Summary
13 July 2014 Major revision
23 March 2017 Major revision to align with new and updated company standards. In addition, other major
enhancements were added based on latest project observations, deviations, and comments.
Below is the summary of the main changes:
(1) Modify the entire standard and its selection chart to include the heavy duty sealless pumps
per the new 31-SAMSS-685 for extremely hazardous applications.
(2) Increase the driver power limit for integrally geared pumps from 150 HP to 200 HP.
(3) Mandate closed impeller design for vertical suspended pumps in sulfur applications.
(4) Increase the suction specific speed limit from 11,000 to 12,000.
(5) Perform major modifications to the seal selection table to account for highly hazardous
liquids and to have better alignment with international standards and practices.
(6) Eliminate the reference to auxiliary piping standard 01-SAMSS-017 which is planned for
deletion by end of 2016 and align with international standard requirements.
(7) Add new standard requirements addressing Pitot tube pump design.
(8) Allow international standard coating for pumps as per manufacturer normal procedures.
(9) Add a new requirement to prevent excessive pump oversizing.
(10) Allow reduced head rise and cut water clearance for low and medium size pumps.
This should improve pump efficiency and provide better pump selection without jeopardizing
reliability.
(11) Amend the minimum flow recycle line requirement to allow common recycle instead of
individual recycle when there is satisfactory field experience.
(12) Mandate minimum efficiency for pumps above 50 HP.
(13) Mandate conducting life cycle assessment for pumps above 500 HP instead of 1,000 HP.
(14) Add a new appendix for terms and definitions.

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Table 1 - Mechanical Seal Selection Guide

Highly Hazardous Services as defined in Appendix D (Note 1);

Maximum Pumping -40 to 176 >176

Temperature °C (°F) (-40 to 350) (>350)
Seal Code (Note 1) C2A3A (Note 2) C2A3C
Category 2 2
Arrangement 3 3
Seal Type A (Note 3) C (Note 6)
API Seal Configuration 3CW 3CW
Special Materials (Note 4) ------
Seal Flush Plan 53B or 54 ( Notes 5 & 8) 54 or 53B (Notes 7 & 8)
Quench Plan / Type None None

Note 1: Sealless pumps may be used in line with Appendix A for single stage pumps.
Note 2: For sour water and sour hydrocarbons with H2S concentrations less than 5,000 PPM, seal
code C2A2A (seal configuration 2CW-CS) with Plan 32/75 may be used when all the following
conditions are met:
 The flushing system for Plan 32 shall be reliable and available at all times including plant
startup,
 Economical study justifies the use of Plan 32 over Plan 53B taken into account the cost of
reprocessing the continuous supply of flushing fluid.
 Plan 32 external flush is non-flashing liquid and it does not have more than 500 PPM of
H2S.
Note 3: If approved by the Standards Committee Chairman; Pumps, Seals, and Mixers, a bellows seal
is an acceptable alternative to the standard Type A seal in applications where the maximum
seal chamber pressure does not exceed 1,830 kPa abs (265 psia).
Note 4: For DGA, ADIP, and other amine services, Type C bellows seal or Type A seal with FFKM
elastomers shall be used. For other services, ensure using compatible elastomers.
Note 5: For overhung pumps, Plan 53B shall be used. For between bearing pumps, Plan 53B or 54
shall be used. Plan 53B and 54 shall comply with 31-SAMSS-012.
Note 6: Consult Standards Committee Chairman; Pumps, Seals, and Mixers for seal and flush
selection if seal chamber pressure exceeds 1,830 kPa abs (265 psia).
Note 7: Plan 53B and 54 shall comply with 31-SAMSS-012.
Note 8: Additional process side flush plans (such as 01, 02, 11, 13, 21, etc.) may be used in parallel
with Plan 53B and 54 when recommended by seal vendor or mandated by 31-SAMSS-012.

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Document Responsibility: Pumps, Seals, and Mixers Standards Committee SAES-G-005
Issue Date: 14 March 2017
Next Planned Update: 14 March 2020 Centrifugal Pumps

Table 1 - Mechanical Seal Selection Guide (cont'd)

Non-flashing Dry Hydrocarbon Services; containing up to 0.2% water and 500 PPM of
H2S by weight and having Vapor Pressure ≤ 100 kPa abs (14.7 psia) at maximum
Pumping Temperature.
Maximum Pumping -7 to 93
Temperature °C (°F) (20 to 200)
C1A1A
Seal Code
C2A1A
1 for ASME and ISO Pumps
Category
2 for API Pumps
Arrangement 1
Seal Type A (Notes 1 & 2)
API Seal Configuration 1CW-FL (Note 1)
Special Materials (Note 3)
Horizontal Pumps: 11/61
Seal Flush Plan
Vertical Pumps: 13/61
without Suspended Solids
(Note 4)
Horizontal Pumps: 31/61
Seal Flush Plan
Vertical Pumps: 32/61 or 31/13/61
with Suspended Solids
(Note 5)
Quench Plan / Type 51 (Methanol) (Note 6)
Seal Leakage Detection Plan 65A (Level Transmitter) (Notes 7 & 8)

Note1: If the pumped liquid is MTBE or gasoline containing MTBE, the seal shall be Type C
(Bellows) and the seal configuration shall be 1CW-FL.
For Category 1 seals in services other than gasoline or MTBE, the seal shall be 1CW-FX.
Note 2: If approved by the Standards Committee Chairman; Pumps, Seals, and Mixers, a bellows
seal is an acceptable alternative to the standard Type A seal in applications where the
maximum seal chamber pressure does not exceed 1,830 kPa abs (265 psia).
Note 3: If the pumped fluid is non-sour and auto-refrigerant, Nitrile elastomers shall be used.
Note 4: For vertical in-line pumps having their impellers with balance holes, Seal Flash Plan 11/61
shall be used.
Note 5: API Plan 31 shall be used only if the pump differential pressure exceeds 175 kPa (25 psi).
Otherwise, Plan 32 flush with a compatible clean liquid shall be used.
Note 6: The methanol feed system, Plan 51, is only required for pumping temperature lower than
0°C (32°F) and it is not intended to provide a continuous flow of methanol. It is used
immediately prior to start-up to prevent or eliminate icing on the atmospheric side of the
primary seal. It shall be connected to the atmospheric side of the dry-running backup seal.
Note 7: Pumps in bulk plants, truck unloading pumps, and lube oil pumps do not require seal leak
detection system.
Note 8: If level transmitter cannot be used, level switch would be acceptable if approved by the
Standards Committee Chairman; Pumps, Seals, and Mixers.

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Document Responsibility: Pumps, Seals, and Mixers Standards Committee SAES-G-005
Issue Date: 14 March 2017
Next Planned Update: 14 March 2020 Centrifugal Pumps

Table 1 - Mechanical Seal Selection Guide (cont'd)

Non-flashing Dry Hydrocarbon Services; containing up to 0.2% water and 500 PPM of
H2S by weight and having Vapor Pressure ≤ 100 kPa abs (14.7 psia) at maximum
Pumping Temperature.

Maximum Pumping 94 to 176 >176 (>350)

Temperature °C (°F) (201 to 350) (Notes 7 & 8)
C1A1A
Seal Code C2A1C
C2A1A
1 for ASME and ISO Pumps
Category 2
2 for API Pumps
Arrangement 1 1
Seal Type A (Note 1) C; Bellows (Notes 6)
API Seal Configuration 1CW-FL (Notes 2 & 3) 1CW-FL (Note 3)
Seal Flush Plan Horizontal Pumps: 21/61 or 23/61 32
without Suspended Solids Vertical Pumps: 23/61 (Note 7)
Horizontal Pumps 32/61 or 41/61
32
with Suspended Solids Vertical Pumps 32/61 or 41/13/61
(Note 7)
(Note 4)
62 (Steam) for pumping
Quench Plan / Type 62 (Steam)
temperature above 149°C (300°F)
Seal Leakage Detection Plan 65A (Notes 3 & 5) 65A (Notes 3 & 5)

Note 1: If approved by the Standards Committee Chairman; Pumps, Seals, and Mixers, a bellows
seal is an acceptable alternative to the standard Type A seal in applications where the
maximum seal chamber pressure does not exceed 1,830 kPa abs (265 psia).
Note 2: Fixed clearance bushing (FX) shall be used instead of floating bushing (FL) for ASME and
ISO pumps in services below 149°C (300°F).
Note 3: 2CW-CS with seal leak detection Plan 75 shall be used if the external flush liquid (Plan
32) will flash upon seal leakage.
Note 4: API Plan 41 shall be used only if the pump differential pressure exceeds 175 kPa (25 psi).
Otherwise, Plan 32 flush with a compatible clean liquid shall be used.
Note 5: If level transmitter cannot be used, level switch would be acceptable if approved by the
Standards Committee Chairman; Pumps, Seals, and Mixers.
Note 6: Consult Standards Committee Chairman; Pumps, Seals, and Mixers for seal and flush
selection if seal chamber pressure exceeds 1,830 kPa abs (265 psia).
Note 7: Seal flush Plan 02 shall be used for asphalt services and may be acceptable for crude
vacuum bottom pumps subject to review and approval by the Standards Committee
Chairman; Pumps, Seals, and Mixers. For seal flush Plan 02, no seal leak detection is
required.
Note 8: If the liquid is above auto-ignition temperature; then, the seal code shall be C2A3C with Plan 53B
or 54 in accordance with 31-SAMSS-012.

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Document Responsibility: Pumps, Seals, and Mixers Standards Committee SAES-G-005
Issue Date: 14 March 2017
Next Planned Update: 14 March 2020 Centrifugal Pumps

Table 1 - Mechanical Seal Selection Guide (cont'd)

Flashing Dry Hydrocarbon Services; containing up to 0.2% water and 500 PPM of H2S
by weight and having Vapor Pressure > 100 kPa abs (14.7 psia) at maximum Pumping
Temperature.

Maximum Pumping -40 to 60

Temperature °C (°F) (-40 to 140)
Seal Code C2A2A
Category 2
Arrangement 2
Seal Type A (Notes 1 & 2)
API Seal Configuration 2CW-CS or 2NC-CS (Note 3)
Special Materials (Note 4)
Seal Flush Plan Horizontal Pumps: 11/61
without Suspended Solids Vertical Pumps: 13/61
Horizontal Pumps: 31/61
with Suspended Solids Vertical Pumps: 32/61
or 31/13/61 (Note 5)
Quench Plan / Type 51 (Methanol) (Note 6)
Seal Leakage Detection Plan 75 or 76 (Note 7)

Note 1: For gasoline services up to 50°C (120°F), refer to seal selection guide under “Non-flashing
Dry Hydrocarbon Services; containing up to 0.2% water by weight and having Vapor
Pressure ≤ 100 kPa abs (14.7 psia) at Pumping Temperature”
Note 2: f approved by the Standards Committee Chairman; Pumps, Seals, and Mixers, a bellows
seal is an acceptable alternative to the standard Type A seal in applications where the
maximum seal chamber pressure does not exceed 1,830 kPa abs (265 psia).
Note 3: If a 2NC-CS seal configuration is supplied, the seal flush Plan shall be 02.
2NC-CS seals are limited to applications above 0°C (32°F).
Note 4: If the pumped fluid is non-sour and auto-refrigerant, Nitrile elastomers shall be used.
Note 5: API Plan 31 shall be used only if the pump differential pressure exceeds 175 kPa (25 psi).
Otherwise, Plan 32 flush with a compatible clean liquid shall be used.
Note 6: The methanol feed system, Plan 51, is not intended to provide a continuous flow of
methanol. It is used immediately prior to start-up to prevent or eliminate icing on the
atmospheric side of the primary seal. It shall be connected to the atmospheric side of the
dry-running backup seal.
Note 7: Plan 75 shall be used when the pumped fluid condenses at ambient temperature such as
hydrocarbon condensate.

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Document Responsibility: Pumps, Seals, and Mixers Standards Committee SAES-G-005
Issue Date: 14 March 2017
Next Planned Update: 14 March 2020 Centrifugal Pumps

Table 1 – Mechanical Seal Selection Guide (cont'd)

Flashing Dry Hydrocarbon Services; containing up to 0.2% water and 500 PPM of H2S
by weight and having Vapor Pressure > 100 kPa abs (14.7 psia) at maximum Pumping
Temperature.

Maximum Pumping 61 to176 >176

Temperature °C (°F) (141 to 350) (>350)
Seal Code C2A2A (Note 1&2) C2A3C (Note 7)
Category 2 2
Arrangement 2 3
Seal Type A (Notes 1 & 3) C; Bellows (Notes 8)
API Seal Configuration 2CW-CS or 2NC-CS (Note 4) 3CW
Seal Flush Plan Horizontal Pumps: 21/61 or 23/61 53B or 54
without Suspended Solids Vertical Pumps: 23/61 (Note 9)
Horizontal Pumps: 32/61 or 41/61
53B or 54
with Suspended Solids Vertical Pumps: 32/61 or 41/13/61
(Note 9)
(Note 5)
Quench Plan / Type None None
Seal Leakage Detection Plan 75 or 76 (Note 6) 53B or 54 (Note 9)

Note 1: If the pumped liquid is MTBE or gasoline containing MTBE:

 Seal code: C2A2C
 Category 2, Arrangement 2, Type C (Bellows), Configuration 2CW-CS.
Note 2: If the liquid is at or above its autoignition temperature, the seal code shall be C2A3C with Plan
54.
Note 3: If approved by the Standards Committee Chairman; Pumps, Seals and Mixers, a bellows seal
is an acceptable alternative to the standard Type A seal in applications where the maximum
seal chamber pressure does not exceed 1,830 kPa abs (265 psia).
Note 4: If a 2NC-CS seal configuration is supplied, the seal flush Plan shall be 02.
2NC-CS seals are limited to applications below 93°C (200°F).
Note 5: API Plan 41 shall be used only if the pump differential pressure exceeds 175 kPa (25 psi).
Otherwise, Plan 32 flush with a compatible clean liquid shall be used.
Note 6: Plan 75 shall be used when the pumped fluid condenses at ambient temperature such as
hydrocarbon condensate.
Note 7: If the liquid is below its auto-ignition temperature; then, seal code C2A2C (seal configuration
2CW-CS) with Plan 32/75 may be used when all the following conditions are met:
The flushing system for Plan 32 shall be reliable and available at all times including plant
startup,
 Economical study justifies the use of Plan 32 over Plan 54 taken into account the cost of
reprocessing the continuous supply of flushing fluid,
Note 8: Consult Standards Committee Chairman; Pumps, Seals, and Mixers for seal and flush
selection if seal chamber pressure exceeds 1,830 kPa abs (265 psia).
Note 9: Plans 53B and 54 shall comply with 31-SAMSS-012. Additional process side flush plans (such as
11, 13, and 21) may be used in parallel with Plans 53B and 54 when recommended by seal
vendor.

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Document Responsibility: Pumps, Seals, and Mixers Standards Committee SAES-G-005
Issue Date: 14 March 2017
Next Planned Update: 14 March 2020 Centrifugal Pumps

Table 1 – Mechanical Seal Selection Guide (cont'd)

Wet Crude or wet hydrocarbon Services; containing more than 0.2% water and less than
500 PPM of H2S by weight.

Vapor Pressure ≤ 100 kPa abs Vapor Pressure > 100 kPa abs
(14.7 psia) at Pumping (14.7 psia) at Pumping
Temperature Temperature
Maximum Pumping <176 <176
Temperature °C (°F) (<350) (<350)
Seal Code C2A1A C2A2A
Category 2 2
Arrangement 1 2
Seal Type A (Note 1) A (Note 1)
API Seal Configuration 1CW-FL 2CW-CS
Special Materials Two hard faces (Note 4) Two hard faces (Note 4)
Horizontal Pumps: 32/61 or 53B Horizontal Pumps: 32/61 or 53B
Seal Flush Plan Vertical Pumps: 32/ or 53B Vertical Pumps: 32/61 or 53B
(Notes 2 & 3) (Notes 2 & 3)
Quench Plan/Type None None
Seal Leakage 65A (Level Transmitter)
75
Detection Plan (Note 5)
Note 1: If approved by the Standards Committee Chairman; Pumps, Seals, and Mixers, a bellows
seal is an acceptable alternative to the standard Type A seal in applications where the
maximum seal chamber pressure does not exceed 1,830 kPa abs (265 psia).
Note 2: For Plan 32, the external flush fluid shall be dry crude, sea water, or any other water with
a TDS less than 30,000 PPM. External flush shall be a non-flashing liquid with a
temperature not exceeding 60°C (140°F) and it shall not contain more than 500 PPM of
H2S.
For plant startup, pumps shall be supplied with a Plan 31 in addition to Plan 32 seal flush
if external flush is not available during plant startup. A check valve shall be installed in
both the Plan 31 and Plan 32 seal flush lines to prevent flushing fluid from entering the
piping system not in use.
Note 3: If an external source of compatible flush fluid is not available then an Arrangement 3 seal
shall be used; Seal Code C2A3A. Flush Plan 54 or 53B shall be used for between
bearing pumps and Plan 53B shall be used for overhung pumps. The seal Plan 54 and
Plan 53B shall comply with 31-SAMSS-012.
Note 4: Silicon Carbide versus Carbon seal face material combination might be used when:
 Saudi Aramco experience is satisfactory on using identical materials in identical
service, or
 Pump speed is not higher than 3,600 RPM and it is clean crude oil service and not in a
GOSP service.
Note 5: If level transmitter cannot be used, level switch would be acceptable if approved by the
Standards Committee Chairman; Pumps, Seals, and Mixers.

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Document Responsibility: Pumps, Seals, and Mixers Standards Committee SAES-G-005
Issue Date: 14 March 2017
Next Planned Update: 14 March 2020 Centrifugal Pumps

Table 1 - Mechanical Seal Selection Guide (cont'd)

Dry Crude Services; containing up to 0.2% water and less than 500 PPM of H2S by weight.

Vapor Pressure ≤ 100 kPa abs Vapor Pressure > 100 kPa abs
(14.7 psia) at Pumping (14.7 psia) at Pumping
Temperature Temperature
Maximum Pumping <176 <176
Temperature °C (°F) (<350) (<350)
C1A1A C1A2A
Seal Code
C2A1A C2A2A
1 for ASME and ISO Pumps 1 for ASME and ISO Pumps
Category
2 for API Pumps 2 for API Pumps
Arrangement 1 2

Seal Type A (Note 1) A (Note 1)

1CW-FX or FL for ASME
API Seal Configuration and ISO Pumps 2CW-CS
1CW-FL for API pumps
Special Materials Two hard faces (Note 3) Two hard faces (Note 3)
Horizontal Pumps: 31/61 Horizontal Pumps: 31/61
Seal Flush Plan Vertical Pumps: 13/61 Vertical Pumps: 13/61
(Note 2) (Note 2)
Quench Plan/Type None None
Seal Leakage 65A (Level Transmitter)
75
Detection Plan (Note 4)

Note 1: If approved by the Standards Committee Chairman; Pumps, Seals and Mixers, a bellows seal
is an acceptable alternative to the standard Type A seal in applications where the maximum
seal chamber pressure does not exceed 1,830 kPa abs (265 psia).
Note 2: API Plan 31 shall be used only if the pump differential pressure exceeds 175 kPa (25 psi).
Otherwise, Plan 32 flush with a compatible clean liquid shall be used
Note 3: Silicon Carbide versus Carbon seal face material combination might be used when:
 Saudi Aramco experience is satisfactory on using identical materials in identical service, or
 Pump speed is not higher than 3,600 RPM and it is clean crude oil service and not in a
GOSP service.
Note 4: If level transmitter cannot be used, level switch would be acceptable if approved by the
Standards Committee Chairman; Pumps, Seals, and Mixers.

Saudi Aramco: Company General Use

Page 36 of 54
Document Responsibility: Pumps, Seals, and Mixers Standards Committee SAES-G-005
Issue Date: 14 March 2017
Next Planned Update: 14 March 2020 Centrifugal Pumps

Table 1 - Mechanical Seal Selection Guide (cont'd)

SOUR WATER SERVICES with 50 to 500 PPM of H2S and less than 30,000 PPM of
TDS. (Sealless pumps may also be used for this service in line with Appendix A sheet 3 if the
driver rated power is up to 300 HP).

Up to 70°C and Non-flashing Above 70°C or Flashing

Maximum Pumping Up to 70
Above 70 (158)
Temperature °C (°F) (Up to 158)
Vapor Pressure ≤ 100 kPa abs (14.7 psia) Any
C1A1A C1A2A
Seal Code
C2A1A C2A2A ( Notes 1 & 6)
1 for ASME and ISO Pumps 1 for ASME and ISO Pumps
Category
2 for API Pumps 2 for API Pumps
Arrangement 1 2 (Notes 1 & 6)

Seal Type A (Note 2) A (Notes 2 & 6)

1CW-FX or FL for ASME
API Seal Configuration and ISO Pumps 2CW-CS
1CW-FL for API pumps
Seal Flush Plan Horizontal Pumps: 11/61 23/61 or 32/61
without Suspended Solids Vertical Pumps: 13/61 (Notes 4 & 5)
Horizontal Pumps: 31/61
with Suspended Solids Vertical Pumps: 32/61 or 31/13/61 23/61 or 32/61
(Note 3)
Seal Leakage
65A 75
Detection Plan

Note 1: Arrangement 1 with Plan 65A shall be used when seal flush Plan 32 is used and the
flush liquid has less than 50 PPM of H2S.
Note 2: If approved by the Standards Committee Chairman; Pumps, Seals, and Mixers, a bellows
seal is an acceptable alternative to the standard Type A seal in applications where the
maximum seal chamber pressure does not exceed 1,830 kPa abs (265 psia).
Note 3: API Plan 31 shall be used only if the pump differential pressure exceeds 175 kPa (25 psi).
Otherwise, Plan 32 flush with a compatible clean liquid shall be used.
Note 4: Plan 21/61 may be used if liquid temperature is below 93°C. The heat exchanger for the
seal flush plans 21 and 23 shall be sized to maintain the flush fluid at or below 60°C
(140°F)
Note 5: Plan 32 flush shall be raw water (with TDS less than 30,000 PPM) or sea water without
suspended solids. Plan 32 flushing liquid temperature shall not exceed 60°C (140°F).
Note 6: If water temperature is above 176°C, C2A2C shall be used.

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Document Responsibility: Pumps, Seals, and Mixers Standards Committee SAES-G-005
Issue Date: 14 March 2017
Next Planned Update: 14 March 2020 Centrifugal Pumps

Table 1 - Mechanical Seal Selection Guide (cont'd)

WATER SERVICES
Water with more than
Water Services with up to 30,000 PPM of TDS
30,000 PPM of TDS and
and up to 50 PPM of H2S and Seawater
up to 500 PPM of H2S
(Note 1)
excluding Seawater
Maximum
Pumping Up to 60 61-93 > 93
All
Temperature (Up to 140) (141 to 200) (>200)
°C (°F)
C1A1A C1A1A C1A1A C2A1A if non-flashing or
Seal Code C2A1A C2A1A C2A1A ( Note 2) C2A2A if flashing, or C2A3A
1 for ASME & 1 for ASME & 1 for ASME &
Category ISO Pumps ISO Pumps ISO Pumps 2
2 for API Pumps 2 for API Pumps 2 for API Pumps
Arrangement 1 1 1 1, 2 or 3
Seal Type A (Note 3) A (Note 3) A (Note 3) A (Note 3)
1CW-FXor FL for 1CW-FXor FL for 1CW-FX or FL for
ASME & ASME & ASME &
API Seal ISO Pumps ISO Pumps ISO Pumps 1CW-FL if non-flashing
Configuration or 2CW-CS if flashing
1CW-FL for API 1CW-FL for API 1CW-FL for API
pumps pumps pumps
Wetted metal parts shall
Special Materials -------------- -------------- -------------- be Inconel 625, Inconel 718
or Super Duplex
Horizontal Pumps:
Horizontal Horizontal
Seal Flush Plan 23/61 or 32/61 Horizontal and Vertical
Pumps: 11/61 Pumps: 21/61
without Vertical Pumps: Pumps: 32/61 or 53B
Vertical Pumps: Vertical Pumps:
Suspended Solids 23/61 or 32/61 (Note 5)
13/61 13/21/61 (Note 4)
(Note 4)
Horizontal Horizontal
Horizontal Pumps:
Pumps: 31/61 Pumps: 32/61
23/61 or 32/61 Horizontal & Vertical Pumps:
with Suspended or 32/61 or 41/61
Vertical Pumps: 32/61 or 53B
Solids Vertical Pumps: Vertical Pumps:
23/61 or 32/61 (Note 5)
32/61 or 31/13/61 32/61 or 41/13/61
(Note 4)
(Note 6) (Notes 4 & 6)
65A if not flashing
Seal Leakage
None None 75 if flashing
Detection Plan
(Note 7)
Note 1: Seawater typically has a TDS exceeding 30,000 PPM.
Note 2: If water temperature is above 176°C, C2A1C shall be used.
Note 3: If approved by the Standards Committee Chairman; Pumps, Seals, and Mixers, a bellows
seal is an acceptable alternative to the standard Type A seal in applications where the
maximum seal chamber pressure does not exceed 1,830 kPa abs (265 psia).

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Document Responsibility: Pumps, Seals, and Mixers Standards Committee SAES-G-005
Issue Date: 14 March 2017
Next Planned Update: 14 March 2020 Centrifugal Pumps

Note 4: For water condensate up to 77°C (170°F), seal flush plans 11 and 13 might be used for
horizontal and vertical pumps, respectively. For other services, the heat exchanger for the
seal flush plans 21, 23, and 41 shall be sized to maintain the flush fluid at or below 60°C
(140°F).
Note 5: Plan 32 flush shall be raw water (less than 30,000 PPM TDS) or sea water without
suspended solids. The flush liquid shall be cooled to 60°C (140°F) or below and shall
contain less than 50 PPM of H2S.
If Plan 32 is not available then an Arrangement 3 seal shall be used; Seal Code C2A3A,
Flush Plan 54 or 53B. Plans 53B and 54 shall comply with 31-SAMSS-012.
Note 6: API Plan 31 and 41 shall be used only if the pump differential pressure exceeds 175 kPa
(25 psi). Otherwise, Plan 32 flush with a compatible clean liquid shall be used.
Note 7: If level transmitter cannot be used, level switch would be acceptable if approved by the
Standards Committee Chairman; Pumps, Seals, and Mixers.

LEAN DGA, ADIP, AND OTHER AMINE SERVICES (Note 1)

Maximum Pumping Up to 93 >93
Temperature °C (°F) (Up to 200) (>200)
C1A2C (Note 2) C1A2C
Seal Code C2A2C C2A2C
1 for ASME and ISO Pumps 1 for ASME and ISO Pumps
Category
2 for API Pumps 2 for API Pumps
Arrangement 2 2
Seal Type C; Bellows (Note 3) C; Bellows (Note 3)
API Seal Configuration 2CW-CS 2CW-CS
Horizontal Pumps: 11/61 Horizontal 23/61 or 21/61
Seal Flush Plan Vertical Pumps: 13/61 Vertical: 23/61
Quench Plan / Type None None
Leakage Detection Plan 75 75

Note 1: Lean amine: is a non-flashing liquids that will not cause sudden release of H2S in case of leakage
to atmosphere. It typically comes from the amine regeneration unit in which the rich amine is
treated to release most of the H2S and CO2 in it. Lean amine can have high H2S concentration
exceeding in some cases 500 PPM.
Note 2: For vertical pumps in open sump applications, C2A1C 13/61 is acceptable.
Note 3: Consult Standards Committee Chairman; Pumps, Seals, and Mixers for seal and flush selection
if seal chamber pressure exceeds 1,830 kPa abs (265 psia).
If approved by the Standards Committee Chairman; Pumps, Seals, and Mixers, Type A seal with
FFKM elastomers may be used.

Saudi Aramco: Company General Use

Page 39 of 54
Document Responsibility: Pumps, Seals, and Mixers Standards Committee SAES-G-005
Issue Date: 14 March 2017
Next Planned Update: 14 March 2020 Centrifugal Pumps

Table 1 - Mechanical Seal Selection Guide (cont'd)

GLYCOL AND TEG SERVICES

Maximum Pumping Up to 93 > 93
Temperature °C (°F) (Up to200) (> 200)
C1A1A C1A1A
Seal Code C2A1A C2A1A
1 for ASME and ISO Pumps 1 for ASME and ISO Pumps
Category 2 for API Pumps 2 for API Pumps
Arrangement 1 1
Seal Type A (Note 1) A (Note 1)
1CW-FX or FL for ASME/ISO 1CW-FX or FL for ASME/ISO
Seal Configuration
1CW-FL for API pumps 1CW-FL for API pumps
FFKM elastomers for pumping
Special Materials --------
temperature above 176°C (350°F)
Horizontal Pumps: 11/61 Horizontal and Vertical
Seal Flush Plan Vertical Pumps: 13/61 Pumps: 23/61 or 21/61
Quench Plan/Type None None
Seal Leakage Detection None None
Note 1: Bellows seal is an acceptable alternative to the standard Type A seal in applications where the
maximum seal chamber pressure does not exceed 1,830 kPa abs (265 psia).

CAUSTIC SERVICES
(Sealless pumps shall be used for this service up to 225 kW (300 HP). For larger pump size,
mechanical seal shall be as below).
Maximum Pumping Up to 93 > 93
Temperature °C (°F) (Up to200) (> 200)
C1A1A C1A1A
Seal Code C2A1A C2A1A
1 for ASME and ISO Pumps 1 for ASME and ISO Pumps
Category 2 for API Pumps 2 for API Pumps
Arrangement 1 1
Seal Type A (Note 1) A (Note 1)
Seal Configuration 1CW-FL 1CW-FL
Special Materials Ethylene propylene elastomers FFKM elastomers
Horizontal Pumps: 11/62 Horizontal and Vertical
Seal Flush Plan
Vertical Pumps: 13/62 Pumps: 23/62 or 21/62
Quench Plan/Type Water Water
Seal Leakage Detection None None
Note 1: If approved by the Standards Committee Chairman; Pumps, Seals, and Mixers, a bellows seal is
an acceptable alternative to the standard Type A seal in applications where the maximum seal
chamber pressure does not exceed 1,830 kPa abs (265 psia).
Saudi Aramco: Company General Use
Page 40 of 54
Document Responsibility: Pumps, Seals, and Mixers Standards Committee SAES-G-005
Issue Date: 14 March 2017
Next Planned Update: 14 March 2020 Centrifugal Pumps

Table 1 - Mechanical Seal Selection Guide (cont'd)

SODIUM HYPOCHLORITE SERVICES
(Sealless pumps shall be used for this service up to 225 kW (300 HP). For larger pump size,
mechanical seal shall be as below)
Maximum Pumping Up to 93 > 93
Temperature °C (°F) (Up to 200) (> 200)
C1A1A C1A1A
Seal Code C2A1A C2A1A
1 for ASME and ISO Pumps 1 for ASME and ISO Pumps
Category 2 for API Pumps 2 for API Pumps
Arrangement 1 1
Seal Type A (Note 1) A (Note 1)
Seal Configuration 1CW-FL 1CW-FL
Special Materials ---------- ------------
Horizontal Pumps: 11/62 Horizontal & Vertical Pumps:
Seal Flush Plan Vertical Pumps: 13/62 23/62 or 21/62
Quench Plan/Type Water Water
Seal Leakage Detection Plan None None

Note 1: If approved by the Standards Committee Chairman; Pumps, Seals, and Mixers, a bellows seal is
an acceptable alternative to the standard Type A seal in applications where the maximum seal
chamber pressure does not exceed 1,830 kPa abs (265 psia).

HORIZONTAL SULFUR PUMPS (Note 1)

Seal Code C2A1A (Note 2)
Category 2
Arrangement External seal with single coil spring
Seal Type A
Seal Configuration 1CW-FL
 Two hard faces – Silicon Carbide
Special Materials  The dynamic elastomer shall be Viton coated by Teflon.
 Other elastomers material shall be Viton.
Seal Flush Plan 02/62 or 01/62
Quench Plan/Type Steam
Seal Leakage Detection Plan None (Note 3)

Note 1: Mechanical seal vendor shall demonstrate successful experience with the proposed seal.
Pumps equipped with hydrodynamic seal (no mechanical seal) are acceptable alternative to
mechanically sealed pumps.
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Note 2: The use of hydrodynamic seal instead of mechanical seal in continuously running pumps is
acceptable. In this design and during pump operation, one or more auxiliary impellers are
installed in the stuffing box to generate reverse hydrodynamic head in the stuffing box that will
relieve the pump stuffing box completely from its pressure; thus, preventing liquid leakage to
atmosphere.
The use of magnetic drive or canned motor sealless pumps shall be approved by the Standards
Committee Chairman; Pumps, Seals, and Mixers.
Note 3: The drain piping shall be steam traced to the edge of the baseplate and shall terminate with
flange.

General Mechanical Seal Notes:

1. An orifice shall be provided in the seal leakage piping, downstream of the level/pressure
transmitter. The minimum orifice diameter shall be 3.2 mm (⅛ in).
2. The setting of the pressure transmitters shall be 70 kPa gauge (10 psig). If the seal leakage
piping is connected to the pressure sewer or flare header, a differential pressure transmitter
across the orifice shall be used and set at 70 kPa gauge (10 psi).
3. An alarm shall be provided for all arrangements 1 and 2 seals with seal leak detection systems.
An alarm and a trip shall be provided for Arrangement 3 seals in highly hazardous services and
flammable liquids. If the pump trip will introduce major safety or process risks, the trip
requirement may be waived subject to concurrence by the operating department and the Loss
Prevention Department.
When the seal system has an alarm or a shutdown protection, a time delay relay, adjustable to
30 seconds, shall be provided to actuate the alarm/shutdown. This relay shall not be included in
the pump vendor's scope of supply.
4. Mechanical seal drain and vent piping shall be terminated at the baseplate edge with a flange.
5. Leakage from seals having throttle bushings shall be hard piped to the gravity sewer.
Leakage from seals having auxiliary dry running backup seals shall be hard piped to either the
pressure sewer, closed drain system or the flare header. A check valve shall be installed
downstream of the orifice to prevent reverse flow into the seal chamber.
6. The surface of shaft sleeves shall be overlaid under the dynamic secondary sealing elastomers
in contact with the pumped liquid. The overlay shall be of a wear resistant material such as
Stellite, chrome oxide, Colmonoy, and tungsten carbide. If the dynamic O-ring is sealing directly
on the hard face instead of the shaft sleeve, then the overlay is not required.
7. Arrangement 3 seal barrier fluid shall be compatible with the pumped product to avoid product
contamination.
8. When Plan 54 is specified, one independent seal plan shall be provided for each pump. The use
of common seal Plan 54 for more than one pump is not acceptable.
9. To avoid contamination with pumped product, suitable barrier fluid shall be selected for
Arrangement 3 seals.
10. For pumps in open sump and drain system service, the pump mechanical seal shall be designed
to handle suspended solids. This can be done by selecting proper seal flush plan such as plans
12, 31, or 32.

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11. For seals not in accordance with 31-SAMSS-012, all process wetted metal components shall be
of the following materials with the exception of seal springs and bellows:

Fluid Service Seal Material

Liquid with more than 30,000 TDS other than
Inconel 625, Inconel 718 or Super Duplex
seawater
UNS S 31254, UNS S 39276, Hastelloy C276 & C4,
Seawater
Monel or Super Duplex.
Raw (aquifer) water with up to 30,000 TDS 904L, Super Duplex or Duplex.
Wet crude service 904L or Super Duplex.
All other services 316 or 316L SS

Metal parts not in contact with the medium pumped shall be 316 SS.
Seal springs shall be of Hastelloy C-276, C4, C22 or equivalent ASTM material
If bellows seals are provided, the bellows material shall be Inconel 625 or 718.
12. Plan 32 shall be provided with a solenoid valve. The valve shall be set to automatically open two
minutes before pump startup (i.e., startup permissive). It shall also automatically close 30
minutes after the pump is shutdown in order to flush the seal and pump cavity.
13. Seal Plan 53B system shall have a low pressure trip. The configuration of the system shall allow
for at least 4 days of normal leakage between the refill set point and the trip set point.
14. For all seal plans with cooling water, closed sight flow indicators shall be furnished in each
cooling water outlet line.
15. When external circulation pump is provided for Plan 53, the seal system shall include a method
to detect circulation pump failure such as low barrier flow measurement, high barrier liquid
temperature upstream the cooler or low current on the external circulation pump motor. If a low
current is used, it shall not be included in the pump vendor's scope of supply.

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Table 2 - Pump Metallurgy Application Guide

Material Code

Normal Operating Horizontal Vertically

Temperature and Vertical Suspended
°C (°F) In-Line Pumps Pumps
Dry Hydrocarbon Service (Note 1)
HK VK
HKA2 (HSX for VKA (VSX for
< 0 (< 32) hydrocarbons hydrocarbon
Non-Sour 0 to 400 (32 to 750) containing containing
(Note 2) elemental sulfur elemental sulfur
above 121°C s above 121°C
(250°F) (250°F)
0 to 285 (32 to 550) HKA4 VKA1
Sour (Note 3)
> 285 (> 550) HSX VSX
Wet Hydrocarbon Service (Note 4)
Non-Sour All HKA4 VKA1
Sour(Note 3)
(except wet crude charge 0 to 285 (32 to 550) HKA4 VKA1
and transfer) > 285 (> 550) HSX VSX
Wet Crude Charge and
Wet Crude Transfer All HD1 VD1
Water Services
Condensate Water, Treated Cooling
All HKA2 VKA
Water (Note 8)
 93 ( 200) HKA4 VKA1
Boiler Feed Water
> 93 (> 200) HSX VSX
Demineralized Water All HSI VSI
Other water with TDS exceeding
All HSZ VSZ
30,000 ppm (Notes 3, 6 & 9)
Other water with TDS from 3,000 ppm  150 ( 302) HD1 VD1
up to 30,000 ppm (Note 3 & 6) > 150 (> 302) HSZ VSZ
Other Water services with TDS below  50 ( 122) HSI VSI
3000 ppm including Drinking Water 51 to 179 (123 to 355) HD1 VD1
(Notes 3 & 6) ≥ 180 (≥ 356) HSZ VSZ
Manufacturer Manufacturer
Domestic Sewage All
standard standard
Sump Oil/Water Mixture All HSI VSI
Other Fluids (Note 7)
Molten Sulfur All HKA4 VSI
Amine and Glycol (Note 5) All HSI VSI
Acid and Chemicals All (Note 7) (Note 7)

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Notes:
(1) Up to 0.2% water by weight.
(2) HKA2 and VKA material codes shall be used if the normal pumping temperatures is not less
than 0°C and when the lowest transient, starting or venting conditions will not reduce the
casing temperature below -18°C. Otherwise, use HK and VK material codes.
(3) Sour service shall be as defined in NACE MR0175/ISO 15156. Material in sour water shall
meet NACE MR0175/ISO 15156.
(4) Greater than 0.2% water by weight.
(5) If the pump liquid contains more than 50 PPM of chloride with pumping temperature above
50°C or if the TDS is higher than 3,000 PPM, HSI material code shall not be used and the
Standards Committee Chairman; Pumps, Seals, and Mixers shall be consulted regarding
selection of the material.
(6) Alternative proven materials for the specific service, based on existing satisfactory long term
experience, may be used when approved by Operating Department and the Standards
Committee Chairman; Pumps, Seals, and Mixers.
(7) The Standards Committee Chairman; Pumps, Seals, and Mixers shall be consulted regarding
selection of specific material. For sodium hypochlorite services, suitable nonmetallic or
titanium construction shall be used. Non-metallic pump construction may be proposed for
pump with driver rating up to 112 kW (150 HP) subject to the review and approval of the
Standards Committee Chairman; Pumps, Seals, and Mixers.
(8) The material selection for the cooling tower circulation pump shall be based on the expected
TDS in the liquid in line with the above table “Other water” columns.
(9) If the pump liquid contains more than 80,000 PPM of chloride, HSZ material code may not be
suitable. The Standards Committee Chairman; Pumps, Seals, and Mixers shall be consulted
regarding selection of the material.

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Table 3 - Test Requirements for Centrifugal Pumps

Manufacturer ASME, ISO, 31-SAMSS-004/685

Standard and Sealless and Main Fire Water
Hydrotest
Witnessed No No Yes
Certified No (1) Yes Yes
Mechanical Run & Performance (3)
Witnessed No No Yes (2)
Certified No (1) Yes Yes
NPSH Testing (4)
Witnessed No No Yes (6)
Certified No (1) Yes (5) Yes (6)

Notes:
(1) All tests for pumps in firewater jockey and molten sulfur services shall be certified.
(2) If more than one pump on the same Purchase Order of identical type, design, and design
conditions are presented for inspection as a lot, the test requirements shall be as follows:
a. For high energy pumps, as defined by 31-SAMSS-004, and for main firewater pumps, all
pumps shall be fully witness tested.
b. For low energy pumps, one pump, selected at random shall be fully witness tested.
The remaining pumps shall be fully shop tested and test certificates shall be provided;
(3) All certified and witnessed pump performance/running tests shall be conducted using
calibrated drivers.
(4) Open pit vertical sump pumps require a minimum submergence test in lieu of an NPSH test.
Firewater pumps shall be NPSH tested at minimum flow, rated flow and 150% of rated flow.
For vertical firewater pumps, the minimum submergence test may be used in lieu of an NPSH
test if it is more restrictive (i.e., pump performance will drop due to minimum submergence
requirement before any drop of pump performance due to low NPSH margin).
Multiphase pumps do not require NPSH testing.
(5)
a. NPSH testing is required on all pumps where NPSH margin (NPSHA over NPSH3) at
120% of the rated flow is less than 1 meter (3.3 feet).
b. For all other pumps, only one pump of a set of identical pumps requires NPSH testing.
(6)
c. Witnessed NPSH testing shall be performed for all high energy pumps, as defined in
31-SAMSS-004, and for main firewater pumps.
d. All vertically can mounted pumps and all pumps where the NPSH margin (NPSHA over
NPSH3) at 120% of the rated flow is less than 1 meter (3.3 feet) shall be fully NPSH
tested and only one pump of a set of identical pumps is required to be witnessed.
e. For all other pumps, only one pump of a set of identical pumps shall be NPSH tested
and witnessed.

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N Driver ≤ 37 KW
(50 HP) in Domestic START HERE
sewage or community
Appendix A - Centrifugal Pump water?
Single stage OH or VS pump Y Go to
Selection Guide for highly Hazardous liquid as
defined in Appendix D
Sheet 3
Y

Sheet 1 of 3, Attachment to SAES-G-005 N From

Sheet 3

Hydrocarbon and Storm Y Go to

Water Service ? Sheet 2

N Y
Rich Amine/DGA Amine, DGA & TEG
Service ? Service?

Y
N
SAES-G-005 compliance is not
required. If self priming pump type is
Y used, the following shall apply:
Domestic sewage or
sewage effluent service • Suction lift shall not be
below 300 HP? more than 6 meters (20 feet).
• Automatic air release valve or
N continuous bleed with orifice
shall be provided upstream the
check valve in the discharge piping.
Y
Sulfur Service Below
300 HP?

PUMP SHALL COMPLY

WITH NFPA 20 & Main Fire Water
SAES-B-017 OR B-009 Pump?
(refer to SAES-G-005 Space limitation Y
Para 4.1.1.1) does not permit Horizontal
installation?
N
N
Y Between
bearing single stage or vertical Y Cooling or Utility Water Suction conditions Y
suspended pump Service ≤ 225 kW (300 prohibit the use of horizontal
type? HP)? pump?

N N N

Rated Discharge Pressure Y

Exceeds 1900 kPa gauge (275 psig)?

N
VERTICAL IN-LINE
Rated Suction Pressure Y PUMP COMPLYING
Exceeds 520 kPa gauge (75 psig)? WITH
31-SAMSS-004

Liquid
Space limitation Y Min Temp. less than 0°C (32°F) or Y VERTICAL SUSPENDED
does not Permit Horizontal Max Temp. higher than 120°C OR DOUBLE CASING
(250°F)? PUMP COMPLYING
installation?
WITH 31-SAMSS-004

N N
Liquid Vapor
Y
Suction conditions Press ≥ 205 kPa abs (30 psia)
prohibit the use of horizontal @ max. Operating temp?
HORIZONTAL PUMP
pump?
COMPLYING WITH
N 31-SAMSS-004
Use vertical N
lined shaft
Pump type Y
Driver nameplate exceeds
112 kW (150 HP)? API 610
N

HORIZONTAL END
PUMP SHALL BE VERTICAL IN-LINE
SUCTION PUMP
VENDOR PUMP COMPLYING
COMPLYING WITH
STANDARD WITH ASME
Saudi B73.2 Company
Aramco: General Use
DESIGN
ASME B73.1 OR
ISO 2858 & ISO 5199
OR ISO 5199 ASME/ISO
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Document Responsibility: Pumps, Seals, and Mixers Standards Committee SAES-G-005
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Next Planned Update: 14 March 2020 Centrifugal Pumps

Appendix A – Centrifugal Pump Selection Guide Vertically suspended pump of the

discharge through column design such as
Sheet 2 of 3, Attachment to SAES-G-005 VS1 and VS2 pump type (side discharge
Y pump design is not allowed) in accordance
with 31-SAMSS-04. This pump shall
have a mechanical seal and non- metallic
From N bushings and wear rings. All non-metallic
Lube Oil Service?
Sheet 1 parts in the pump and the seal shall be
MTBE compatible if gasoline is drained
into the collection sump.
Y Flammable
Y
Open Sump Service? hydrocarbon
service?

N
Y
Storm water Suction lift is more
service ? than 6 m (20 ft) ?
N
N Y N

N N
Horizontal Self-Priming pump
can meet the operating Driver nameplate exceeds
conditions including NPSH? 112 kW (150 HP)?

Y
Y
Y
Rated Discharge Pressure Vertically
exceeds 1900 kPa gauge (275 psig)? suspended pumps in oily water Y
or storm water services
with driver nameplate below
N 225 kW (300 HP)?

Y
Rated Suction Pressure exceeds N
520 kPa gauge (75 psig)? PUMP SHALL BE
HORIZONTAL SELF-
PRIMING TO
VENDOR STANDARD
N DESIGN

Y
Driver nameplate exceeds
112 kW (150 HP)?

Y
Min Liquid Temp. less than 0°C (32°F)
Or Max. Temp. higher than 65°C
(150°F)?

Y Liquid Vapor
Press ≥ 175 kPa abs (25 psia) at max.
operating temp?

Y
Space limitation Y
Suction conditions does not permit Horizontal
prohibit the use of horizontal installation?
pump?

N N

Y Suction conditions Y
Space limitation prohibit the use of horizontal
does not permit Horizontal pump?
installation?

ASME/ISO N N API 610

VERTICAL IN-LINE VERTICAL SUSPENDED VERTICAL SUSPENDED
PUMP HORIZONTAL END WITH DISCHARGE WITH DISCHARGE
HORIZONTAL PUMP VERTICAL IN-LINE PUMP
COMPLYING WITH SUCTION PUMP THROUGH THE COLUMN THROUGH THE
COMPLYING WITH COMPLYING WITH
ASME B73.2 COMPLYING WITH OR DOUBLE CASING COLUMN DESIGN TO
31-SAMSS-004 31-SAMSS-004
OR ISO 5199 ASME B73.1OR PUMP COMPLYING VENDOR STANDARD
ISO 2858 and ISO 5199 WITH 31-SAMSS-004 DESIGN

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Appendix A – Centrifugal Pump Selection Guide

Sheet 3 of 3, Attachment to SAES-G-005
From
Sheet 1
* Sealless pump may be used for applications that fall outside these
limits if the manufacturer provides sufficient experience and
subject to approval of the Standard Committee Chairman; Pumps,
N Vertical Suspended Pump N Overhung Horizontal Or Seals and Mixers.
with Driver ≤112 KW (150 Vertical Inline Pump With
HP) Driver ≤ 225 KW (300 HP) ** When sealless pump is specified in the selection, it means both
magnetic drive pump design and canned motor pump design are
Y acceptable.
Y

To Sheet 1*
Y Pump with dual
presureised seal?

Magnetic Filtration Will Y

N Be Provided Or Pump Is Magnetic Particles?
Of The Non-Synchronous
Design?
Y N

N External Flush, Duplex Y

Filter, Or Self-Cleaning Solids > 0.25% by
Filter Will Be Provided? weight?*

Y N

Space limitation Y
Y does not permit Horizontal
Viscosity below 0.3 cP installation?
or above 200 cP?*

N N
SEALLESS PUMP PER Y
VENDOR STANDARD Y Autoignition or Autoignition or Y
Vertical Suspended Pump H2S >10,000 PPM ?
DESIGN AND MEET H2S >10,000 PPM ?
With Driver ≤112 KW (150
SAES-G-005
REQUIREMENTS HP)
N
N
Y N
Liquid above Autoignition
Temperature?
N
VERTICAL IN-LINE
Rated Discharge Pressure Y SEALLESS PUMP**
Exceeds 1900 kPa gauge (275 psig)? COMPLYING
WITH
N 31-SAMSS-685

Rated Suction Pressure Y VERTICAL IN-LINE

Exceeds 520 kPa gauge (75 psig)? CANNED MOTOR PUMP
COMPLYING
WITH
N 31-SAMSS-685
Y Space limitation Liquid
does not Permit Horizontal Min Temp. less than 0°C (32°F) or Y
installation? Max Temp. higher than 204°C HORIZONTAL
(400°F)? SEALLESS PUMP**
N COMPLYING WITH
N 31-SAMSS-685

H2S >10,000 PPM ? Y H2S >10,000 PPM ? Y Liquid Vapor

Press ≥ 175 kPa abs (25 psia) Y
HORIZONTAL CANNED
@ max. Operating temp? MOTOR PUMP
COMPLYING WITH
N 31-SAMSS-685
N N

Driver nameplate exceeds Y

112 kW (150 HP)? API-685
N

HORIZONTAL HORIZONTAL
VERTICAL IN-LINE
SEALLESS PUMP**
VERTICAL IN-LINE
CANNED MOTOR SEALLESS PUMP ** CANNED MOTOR ASME/ISO
COMPLYING WITH PUMP COMPLYING WITH PUMP COMPLYING
ASME B73.3 COMPLYING WITH ASME B73.3 WITH ASME B73.3
OR ISO 15783 ASME B73.3 OR ISO 15783 OR ISO 15783
OR ISO 15783

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Appendix B - Typical Drawing of Bleed Bushing Design

Attachment to SAES-G-005

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Appendix C - Minimum Flow Recycle Requirement Guide

Sheet 1 of 1, Attachment to SAES-G-005

START HERE

Yes Pumps discharging

into unpressurized
system?
(e.g., low lift pumps)

No
Yes
Pump rated power  746 kW (1,000 HP)

No

Yes Boiler Feed Water Yes

Pump rated power  225 kW (300 HP) or Services with
Yes
S.G. < 0.6

No No

Potential of Yes Two Pumps or more

Yes
Low Flow?* continuously running
in parallel?

No
No Yes Truck Loading
Pumps

No
Design for
No Recycle Line Design for Common
Individual
Required Recycle Line
Recycle Lines (1)

(*) Recycle line is required to protect the pump if there is a potential for running below the minimum
continuous stable flow due to process conditions, such as loading pumps and pumps with discharge
level control valves, or due to difference in running speeds for pumps running in parallel. It also
required for medium and large pumps to simplify the pump startup and to allow testing the pumps on
recycle mode.

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General Notes:
(1) A common recycle line may be used instead of individual recycle lines if there is existing satisfactory
experience and subject to the review and concurrence of the plant operation and the Standards
Committee Chairman; Pumps, Seals, and Mixers.
(2) When a minimum recycle line is specified for pumps with driver rating more than 37 kW (50 HP), the
recycle line shall have a control valve.
For pumps with diver rating less than 37 kW (50 HP), a control valve or an automatic recirculation
valve (ARV) shall be used. Alternatively, a flow control orifice may be used if it is justified economically
or if the pump is sized/selected to have continuous recycle due to process requirement. The economic
justification document shall be available for the Standard Committee Chairman; Pumps, Seals, and
Mixers review upon request.
(3) The requirement for minimum flow recycle may be waived, subject to concurrence by the operating
department and the Standard Committee Chairman; Pumps, Seals, and Mixers, when all of the
following conditions are met:
a) There is no process need or potential of running at low flow
b) Operational requirements are flexible enough to permit process interruption and pump shutdown
c) The recycle line is not needed to start-up or switch-over the pumps
d) Adequate pump protection is provided to shut down the pump at low flow conditions.
(4) Low lift pumps and other pumps on un-pressurized service, do not require minimum flow recycle lines.
(5) This appendix represents the minimum standard requirement. If the process conditions require the
use of individual recycle lines; then, individual recycle lines shall be provided even if this does not meet
the above flowchart.

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Appendix D - Terms and Definitions

Auxiliary Piping: The piping connected to an equipment to support its function such as vent,
drain, cooling water, lube oil and seal flushing lines.

Flammable Liquid: A liquid that has a flash point equal to or less than 54°C (130°F).
Examples of such fluids are: stabilized crude, gasoline, Jet A-1, Jet JP-4, Jet JP-8, C6 and
lighter feed and blending stocks, and methanol. For purposes of this standard, a combustible
liquid stored or processed at a temperature equal to or higher than 8°C (15°F) below its
flashpoint shall be considered to be a flammable liquid (refer to SAES-B-005).

Highly Hazardous Services: Any of the below pump services:

i. Caustic
ii. Acid
iii. Sour water with more than 500 PPM of H2S
iv. Aromatics more than 25% by weight with exception of gasoline.
v. Liquids with benzene above 0.5% other than gasoline and naphtha where the concentration
limits are 5% and 1% respectively. Gasoline with more than 5% Benzene and Naphtha
with more than 1% benzene shall be considered as highly hazardous services.
vi. Liquids above auto-ignition temperature.
vii. Any liquids with more than 500 PPM of hydrogen sulfide H2S excluding lean amine.
viii. Rich glycol and rich amine.
ix. For other hazardous liquids, use the selection criteria in Figure A.2 of API STD 682
4th edition. The threshold limit value for an 8 hour time weighted average (TLV-TWA)
shall be obtained from the Occupational Safety and Health Standards 1910.1000
Tables Z-1 and Z-2 limits for air contamination. If the selection in Figure A.2 showed that
Arrangement 3 (A3) seal will be required, then this liquid shall be considered as highly
hazardous liquid.
x. Any liquid classified by process licensor as highly hazardous and requiring sealless pumps
or Arrangement 3 seal.

Jockey Pumps: They are the pressure maintenance / make-up pumps. One pump is typically
running continuously to maintain the pressure on the fire protection system/header between
preset limits when the system is not flowing water.

Lean Amine: A non-flashing amine liquids that will not release H2S in case of leakage to
atmosphere. It typically comes from the amine regeneration in which the rich amine is treated
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to release most of the H2S and CO2 in it. Lean amine can have high H2S concentration
exceeding in some cases 500 PPM.

Low-flow High-head Pump Application: Shall be defined as pumps with flow rate up to
250 GPM and with differential head higher than 800 ft.

Main Firewater Pump: A pump that is a provider of liquid flow and pressure dedicated to
fire protection. These pump are normally on standby condition and will start in case of fire.

Normal operating point: The point at which the pump is expected to operate under normal
process conditions.

Raw Water: Well water with TDS not more than 30,000 PPM.

Sour Water Service for Material Selection: Shall be as defined by NACE MR0175/
ISO 15156.

Sour Water Service for Seal Selection: Any service with more than 50 PPM of H2S.

TDS: The total dissolved solids.

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