GENERAL SPECIFICATION

PIPING VALVES VESSELS

GS DEL PVV 144

Fittings

02 20 May 2018 Second Issue

01 25 May 2016 First Issue
Rev. Date Purpose

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Contents

1. Scope ....................................................................................................................... 4

2. Reference documents ............................................................................................. 4

3. Definitions Abbreviations ....................................................................................... 6

3.1 Definitions ....................................................................................................................... 6
3.2 Abbreviations ....................................................................................................................... 7

4. Sourcing of materials .............................................................................................. 7

4.1 From Stockist .................................................................................................................. 7
4.2 From manufacturer .......................................................................................................... 8

5. Design ...................................................................................................................... 8
5.1 Listed components .......................................................................................................... 8
5.2 Unlisted components ....................................................................................................... 8

6. Materials ................................................................................................................... 8
6.1 Carbon steel fittings......................................................................................................... 8
6.2 Galvanized fittings ........................................................................................................... 9
6.3 Austenitic stainless steel fittings....................................................................................... 9
6.4 Austenitic-ferritic steel fittings ........................................................................................ 10
6.5 UNS N06625 grade 1 alloy fittings ................................................................................. 10
6.6 Copper Alloy fittings....................................................................................................... 10
6.7 2 ¼ Cr - 1% Mo fittings and low alloy steels ................................................................... 10

7. Substitution of equivalent materials .................................................................... 10

8. Dimensions ............................................................................................................ 10
8.1 Thicknesses .................................................................................................................. 10
8.2 Other dimensions ............................................................................................................... 11

9. Ends ....................................................................................................................... 12
9.1 Beveled ends ................................................................................................................ 12
9.2 Threaded ends .............................................................................................................. 12
9.3 Socket-welding ends ..................................................................................................... 12

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10. Manufacture ........................................................................................................... 12

10.1 Fittings up to NPS 1½ ................................................................................................... 12
10.2 Fittings NPS 2 or more .................................................................................................. 12
10.3 NDT .................................................................................................................................... 14
10.4 Mechanical testing......................................................................................................... 15
10.5 Repairs of defects ......................................................................................................... 15

11. Cleaning ................................................................................................................. 15

12. Inspection .............................................................................................................. 15

12.1 Quality control ............................................................................................................... 15
12.2 Acceptance ................................................................................................................... 16

13. Documentation ...................................................................................................... 18

13.1 Certificates of conformity ............................................................................................... 18
13.2 Material certificates ....................................................................................................... 18
13.3 Pressure test certificates ............................................................................................... 18

14. Use of this General specification ......................................................................... 19

14.1 Material Data Sheets (MDSs) ............................................................................................ 19

15. Preparation for shipment ...................................................................................... 19

15.1 Markings ....................................................................................................................... 19
15.2 Protection ...................................................................................................................... 20
15.3 Packing .............................................................................................................................. 20

Bibliography ................................................................................................................. 21

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1. Scope
This specification defines the minimum requirements for the fabrication, inspection, shipment
and documentation of fittings made of carbon, low alloy, stainless steel and Nickel, Copper-
Nickel, Titanium alloys.
This specification applies to piping scope of work. Fittings components shall be in conformance
with ASME B31.3 code, their relevant standards and local regulations if any.
Fittings shall be factory-made wrought or forged. Cast fittings are not permitted by this
specification.
The specification shall be read in conjunction with:
• GS DEL PVV 112 that stipulates additional requirements related to specific piping
design issues
• GS DEL PVV 612 that stipulates additional requirements for fittings used in sour service
• GS DEL PVV 622 that stipulates additional requirements for fittings used in mild
and intermediate sour service
• GS DEL PVV 618 that stipulates additional requirements for pipes made of Alloy
UNS N06625 grade 1 material
• GS DEL PVV 619 that stipulates additional requirements for pipes made of duplex
and superduplex materials
• GS DEL PVV 621 that stipulates additional requirements for pipes made of Alloy 2¼
Cr- 1% Mo.
This specification does not apply to fitting materials made of plastic materials.

2. Reference documents
The reference documents listed below form an integral part of this General Specification.

External Documents
Unless otherwise stipulated, the applicable version of these documents, including relevant
appendices and addendums, is the latest revision published at the effective date of this
document.
Reference Title
ASME B1.20.1 Pipe Threads, General Purpose (Inch)
ASME B16.11 Forged Fittings, Socket-Welding and Threaded
ASME B16.9 Factory-Made Wrought Buttwelding Fittings
ASME B31.3 Process Piping
ASME B36.10M Welded and Seamless Wrought Steel Pipe
ASME B36.19M Stainless Steel Pipe

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Reference Title
ASME BPVC Section VIII Rules for Construction of Pressure Vessels
Div 1
ASNT SNT-TC-1A Recommended Practice for Personal Qualification and
Certification in Nondestructive Testing
ASTM A153/A153M Standard Specification for Zinc Coating (Hot-Dip) on Iron and
Steel Hardware
ASTM A991/A991M Standard Test Method for Conducting Temperature Uniformity
Surveys of Furnaces Used to Heat Treat Steel Products
ASTM E165/E165M Standard Practice for Liquid Penetrant Examination for General
Industry
ASTM E709 Standard Guide for Magnetic Particle Testing
EEMUA Publication 234 90/10 Copper nickel alloy piping for offshore applications
ISO 9712 Non-destructive testing - Qualification and certification of NDT
personnel
MSS SP-25 Standard Marking System for Valves, Fittings, Flanges and Unions
MSS SP-43 Wrought and Fabricated Butt-Welding Fittings for Low Pressure,
Corrosion Resistant Applications
MSS SP-95 Swage(d) Nipples and Bull Plugs
MSS SP-97 Integrally Reinforced Forged Branch Outlet Fittings - Socket
Welding, Threaded, and Buttwelding Ends

DEL GS Specifications
Unless otherwise stipulated, the applicable version of these documents, including relevant
appendices and addendums, is the latest revision published.

Reference Title
GS DEL PVV 112 Piping material classes
GS DEL PVV 143 Metallic pipes
GS DEL PVV 171 Steel piping fabrication
GS DEL PVV 175 Cleaning of piping and vessels
GS DEL PVV 611 Welding of pressure containing piping and equipment
GS DEL PVV 612 Piping and equipment subject to severe sour service. Metallurgical
and welding requirements
GS DEL PVV 618 Fabrication of alloy UNS 06625 grade 1 materials

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Reference Title
GS DEL PVV 619 Piping or pressure vessel components in duplex and superduplex
stainless steel
GS DEL PVV 620 Specification for fabrication and welding of piping systems in
cupronickel and associated materials
GS DEL PVV 621 Piping Components in Material 2 ¼ Cr-1% Mo
GS DEL PVV 622 Piping and equipment subject to mild and intermediate sour
service. Metallurgical and welding requirements

3. Definitions Abbreviations
3.1 Definitions
Design Minimum Temperature: Lowest component temperature expected in service. This
temperature may establish special design requirements and material qualification requirements.
Buyer / Contractor: Natural person or legal entity that establishes the order and purchases the
equipment covered by the specification herein. This specification is an integral part of the order.
Inspection body: Organization independent from the Manufacturer, designated by the Buyer
and responsible for monitoring the equipment manufacture from the reception of the raw
materials to the delivery of the piping or equipment
This Body shall insure that the following are respected:
• The regulations when they are applicable to the equipment concerned by the specification
herein
• The technical requirements in the Buyer’s order.
The type, number and distribution of the documents to be compiled by this Body shall be
defined in the contract binding Company or the Engineering Company.
This Body can be Company or the Engineering Company.
Notified body: Organization empowered by the Manufacturer to carry out the inspection
operations provided for under the Regulation in force (when the regulations are applicable to the
equipment concerned by the specification herein).
Engineering Company: Natural person or legal entity who carries out the services
corresponding to the design and supply of the equipment covered by the specification herein
and in particular collects or establishes the data allowing the manufacturer to size the
equipment so that it can satisfy the process function for which it is destined.
Manufacturer: Manufacturer has the responsibility of complying with all of the applicable
requirements and assuring that all work done by others also complies.
Stockist: The firm that acts as an intermediary supplier between the manufacturer and the
purchaser but does not itself carry out manufacturing operations.
Shall: Verbal form used to indicate requirements strictly to be followed.

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purpose other than that which it is specifically furnished without the written consent of Dolphin Energy Ltd.
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Approval: A written response from the Company confirming agreement to a proposal by the
manufacturer or the stockiest.

3.2 Abbreviations
CRA Corrosion Resistant Alloys
DMT Design Minimum Temperature
HAZ Heat-Affected Zone
LTCS Low Temperature Carbon Steel
MDS Material Data Sheet
MT Magnetic Testing
NPS Nominal Pipe Size
NDT Non Destructive Test
PMI Positive Material Identification
PT Penetrant Testing
PWHT Postweld Heat Treatment
WPS Welding Procedure Specification
WPQR Welding Procedure Qualification Record
WT Wall Thickness

4. Sourcing of materials
4.1 From Stockist
Materials can be supplied from stocks. Then the following shall be met:
• The list of potential stockists/stock holders shall have the prior approval of the Company.
• The selected manufacturing supplier shall be within the Company referenced list.
• The stockist shall ensure that the testing and related acceptance requirements stated in
this specification are fulfilled.
• The original Mill certificates of materials shall be made available to Inspector at any time.
• The certificates made by dealers or stockists are not acceptable. However, the stockist is
allowed to perform additional testing on the project materials in order meet the
requirements of this specification.
• The original markings shall be easily visible on products. All piping bulk materials shall be
fully traceable and correctly identified, particularly to the heat and test numbers of the
matching certificates.
• In addition, the Company or Purchaser reserves the right to require any counter-analysis
or confirmatory tests (chemical analysis, mechanical tests, thickness measurements, etc.)
and to undertake a technical assessment.

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purpose other than that which it is specifically furnished without the written consent of Dolphin Energy Ltd.
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4.2 From manufacturer

Materials can also be supplied from a specific order directly from the manufacturer. The
following requirements apply:
• The lists of manufacturers shall be submitted to Company for approval prior to order.
• The manufacturer shall provide documentary evidence of its ability to manufacture the
required scope. As a minimum:
- Previous experience list
- Previous Base material data if required by Company
- Raw Material Supplier List
- Sub-supplier list.

5. Design
5.1 Listed components
On Company request, the calculation note or the proof test report as per code shall be provided.

5.2 Unlisted components

The Manufacturer or Stockist shall submit a dimensioned document and the corresponding
calculation note or proof test report to Company for approval.
In addition, the Manufacturer or Stockist shall submit sketch of the full manufacture sequence:
details of method of manufacture, heat treatment (including PWHT), showing location of all
welds, with joint details, welding procedures and NDT methods for review by Company.

6. Materials
The fittings Manufacturer or Stockist shall issue the relevant Material Data Sheet(s) based both
on the section 14.1 of this specification and on the template and approach applied for pipes
by Appendix 1 of GS DEL PVV 143.

6.1 Carbon steel fittings

Carbon steel used for the fabrication of fittings shall be made by an electric furnace or by the
basic oxygen process.
Fittings shall have sustained a normalized, normalized and tempered or a normalized,
quenched and tempered heat treatment.
TMCP (Thermo Mechanical Control Process) starting material is strictly prohibited for fabrication
of carbon steel fittings.
Starting material delivery condition shall be normalized, normalized and tempered or quenched
and tempered.
In case of the fittings have to be welded, all carbon steels, including normalized steels, used for
the fabrication of fittings shall have a maximum carbon content of 0.23%.

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The carbon equivalent of these materials, calculated using the formula:

Mn Cr +Mo + V Ni +Cu
C =C+ + +
E
6 5 15
shall be less than 0.43 (ladle analysis and finished product analysis).
If the content of alloying elements other than C or Mn is unknown, the formula to be used shall
Mn
be: C E = C + and, in this case, the carbon equivalent shall be 0.40 maximum (ladle analysis
6
and finish product analysis).
In addition, for quenched and tempered fittings type, the quenching temperature shall not be
less than 620°C and shall be indicated in the certificate.
All carbon steels materials of thicknesses greater than 12.7 mm (½ inch) shall be impact tested
at minus 29°C (-20°F) in accordance with ASME B31.3 unless more stringent requirements
(including lower impact test temperatures) are already required in the product specification.
All carbon steel materials for services at lower temperatures (i.e., below minus 29°C) shall
undergo toughness testing in accordance with the requirements of their reference codes and
material standards and other applicable requirements of GS DEL PVV 112.
When LTCS material is considered for line in autorefrigeration situation, flare lines typically, the
minimum design temperature shall not be less than -104°C and impact tests shall be performed
in the weld metal and in the base material (HAZ) whatever the stress ratio. The testing
temperature shall be the line minimum design temperature or -75°C if the stress ratio does not
exceed 0.3.

6.2 Galvanized fittings

Galvanized fittings shall be Hot Dip Galvanized (HDG) in accordance with ASTM A153/A153M;
electrodeposited coating of zinc is not acceptable.

6.3 Austenitic stainless steel fittings

Austenitic stainless steel fittings shall undergo an annealing heat treatment in accordance with
the corresponding ASTM standards.
Substitution of dual grade austenitic stainless steel fittings in lieu of “L” low carbon grade is not
acceptable without a written authorization from the Managing entity identified at the frontpage of
this specification. Material Test Report is mandatory for dual grade materials and shall satisfy
the chemistry requirements of “L” grade and the mechanical requirements of the regular grade.
PMI shall be performed for very low temperature (i.e. below -46°C) applications on material and
on weld area if any (inside and outside).
Cryogenic Service is defined as service with design temperature ranging from minus 46°C to
minus 196°C and continuous operating service temperature below minus 41°C.

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purpose other than that which it is specifically furnished without the written consent of Dolphin Energy Ltd.
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For lines in cryogenic service, whatever the stress ratio, impact testing shall be performed as
follows:
Impact tests
Line Design Minimum Testing In the weld In the base
Material grade(s)
Temperature temperature metal material (HAZ)
321 DMT shall be ≥ -140°C -140°C Required Required
304L or 316L when DMT > -140°C -140°C Required Required
304L or 316L when DMT ≤ -140°C DMT Required Required

6.4 Austenitic-ferritic steel fittings

These fittings shall be supplied in accordance with GS DEL PVV 619.

6.5 UNS N06625 grade 1 alloy fittings

These fittings shall be supplied in accordance with GS DEL PVV 618.

6.6 Copper Alloy fittings

Seamless and welded copper alloys fittings shall be manufactured according to EEMUA
Publication 234 and made from ASTM materials.
Chemical composition shall be Zn ≤ 0.5%, Pb ≤ 0.02%, C ≤ 0.05%.
Only Electric Fusion Welding (EFW) processes shall be used.
All welding and inspection/testing requirements specified in GS DEL PVV 620 are also
applicable to longitudinal seam welds.
Fittings shall be annealed after forming operations.
Testing specimens shall be sampled from a lot totally representative of the fitting (heat, heat
treatment lot, size, manufacturing process and finishing conditions).
Melted lead injection method is not allowed to shape fittings.

6.7 2 ¼ Cr - 1% Mo fittings and low alloy steels

These fittings shall be supplied in accordance with GS DEL PVV 621.

7. Substitution of equivalent materials

Any substitution of materials shall require the prior approval of the Managing entity identified at
the frontpage of this specification.

8. Dimensions
8.1 Thicknesses
A specified schedule of a standard fitting may be replaced by a higher schedule or wall
thickness selection provided that appropriate taper is machined by the Manufacturer or Stockist

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purpose other than that which it is specifically furnished without the written consent of Dolphin Energy Ltd.
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in accordance with the reference codes and standards and subject to the Company agreement.
This taper shall allow for a geometric profile acceptable by the design code for welding the
connecting pipework.

8.1.1 Carbon steels and low alloy steels

The thicknesses of fittings ends shall be in accordance with ASME B36.10M.
To ensure correct geometry for welding, the tolerance of wall thickness at beveled ends shall be
in accordance with ASME B16.9 Figure 1 - the minimum (tmin) and maximum thickness shall be
determined according to Notes (1) and (2), except for the under mentioned tolerances for butt
weld elbows above NPS 14, which replace those stated in the ASME B16.9. Note that the wall
thickness undertolerance for elbows larger than NPS 24 is more stringent than ASME B16.9.

Wall thickness tolerances at any point of elbow ends

Nominal Pipe Size Plus tolerance Minus tolerance
16 to 24
Wall thickness 15% 12.5%
12.7 mm and greater
16 to 24
Wall thickness 20% 12.5%
less than 12.7 mm
Larger than 24 20% 10%

8.1.2 Corrosion Resistant Alloys

The thicknesses of fittings ends shall comply with the standard ASME B36.19M, except that
tolerance only for fittings in schedule 10S shall be in accordance with MSS SP-43.

8.2 Other dimensions

The dimensions of forged, threaded or socket-welding fittings shall comply with the standard
ASME B16.11.
The dimensions of butt-welding fittings shall be in accordance with the standard ASME B16.9,
except that tolerances for stainless steel fittings in schedule 10S shall be in accordance with
MSS SP-43.
The dimensions of swaged nipples shall comply with MSS SP-95.
The dimensions of weldolet, sockolet, threadolet and similar fittings shall comply with
MSS SP-97.
For branch outlet fittings, i.e. sockolets, weldolets, sweepolets, etc., the Manufacturer or
Stockist shall confirm in his quotation that such fittings comply with the requirements of the
ASME B31.3, and advise/confirm the branch outlet fitting face of fitting to crotch dimension in
his quotation.

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purpose other than that which it is specifically furnished without the written consent of Dolphin Energy Ltd.
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For fittings in diameters greater than the limits set by the standards ASME B16.9 and
MSS SP-43, the Manufacturer or Stockist shall submit a dimensioned document and
calculations notes to the Engineering Company for approval.

9. Ends
9.1 Beveled ends
All butt-welding fittings, including the stainless steel fittings in schedule 40S and 80S, shall have
ends beveled in accordance with the standard ASME B16.9.
Bevel preparation (tapering) shall be compatible with the NDT method that will be applied at the
piping fabrication phase.
The ends of stainless steel fittings in schedule 10S shall be in accordance with MSS SP-43.

9.2 Threaded ends

The ends of threaded fittings, including threadolets, shall be in accordance with the standard
ASME B16.11, and shall be threaded per ASME B1.20.1 (NPT).
Threads of galvanized fittings shall be free of galvanizing.

9.3 Socket-welding ends

The ends of socket-welding fittings, including sockolets, shall comply with the standard
ASME B16.11.

10. Manufacture
All manufacturing stages shall be performed by the fitting Manufacturer in its qualified by
Company mill.

10.1 Fittings up to NPS 1½

All fittings up to NPS 1½, of the 3000 #, 6000 # and 9000 # series, shall be forged.
Forging ratio shall be 3:1 minimum. Fittings shall be forged shaped as closed as possible to final
dimensions and in such a manner that axial length of the part is parallel of the axial length of the
fitting.
Fittings formed and/or machined from bars are subject to Company approval, except for
threaded couplings, caps and plugs.
Straight nipples (standard dimensions) is allowed to be machined from seamless pipe.

10.2 Fittings NPS 2 or more

10.2.1 Seamless fittings

Seamless fittings shall be forged or factory-made wrought.

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In case of forging, ratio shall be 3:1 minimum. Fittings shall be forged shaped as closed as
possible to final dimensions and in such a manner that axial length of the part is parallel of the
axial length of the fitting.
In case of fittings made from seamless pipes, GS DEL PVV 143 shall be fully applicable to
the starting material.
Elbows, 180-deg returns and tees shall not be machined directly from bar. Fittings formed
and/or machined from bars are subject to Company approval for NPS up to 4”.

10.2.2 Welded fittings

Welded fittings shall be made from forgings, plates or fusion welded tubular products with filler
metal added (wrought material).
In case of fittings made from welded pipes, GS DEL PVV 143 shall be fully applicable to
the mother pipe.
Welded fittings obtained by forming from a fusion welded tubular element,, with one or two
opposite longitudinal welds, shall be subject to a first day production test for each purchase
item.
The welds shall be made by an approved process. The seams shall be back-welded if the
welding process does not assure full penetration with, on the back, a weld reinforcement of
uniform thickness, free of appreciable distortion.
Welding joint quality factor shall be 1.
GMAW (except for alloy UNS 06625 Grade 1 and Cupronickel), FCAW and ERW are not
acceptable welding processes.
Unlisted fabricated components as per ASME B31.3 shall consist of a single rolled and welded
plate or pipes as detailed above. For all "fabricated" fittings, the Manufacturer or Stockist shall
submit, with his quotation, drawings and calculation notes showing all dimensions and
tolerances of the fittings offered, giving details of method of manufacture, heat treatment
(including PWHT), showing location of all welds, with joint details and NDT methods for review
by the Engineering Company.
Following documentation shall be issued to Company approval, this in order to demonstrate
compliance of the welded fittings to codes and this specification requirements.
• WPS
• WPQR
• NDT report
• Testing reports
• Information related to sequence, forming and heat treatment operations
• Information related to personnel qualification.

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purpose other than that which it is specifically furnished without the written consent of Dolphin Energy Ltd.
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10.2.3 Machining

10.2.3.1 Bevels
Any beveling of the ends of the fittings may be performed by machining or by flame cutting. The
process used shall produce clean, square, burr-free bevel cuts. Whenever flame cutting is
employed, all oxides and traces of previously melted metal shall be removed by grinding or
machining. For corrosion resistant alloys fittings, flame cutting is not permitted.

10.2.3.2 Weld reinforcement

The inside reinforcement of the weld shall be ground-off at each end of the welded fittings; this
machining shall be performed in such a way as to leave a gradual transition.

10.2.3.3 Bore
The bore diameter at the beveled end of butt-weld fittings according to ASME B16.9 shall
“Match Pipe” i.e. shall match the nominal inside diameter of connecting pipe based on the
outside diameter and nominal wall thickness.

10.3 NDT
NDT operators shall be certified ISO 9712 level 2 or ASNT SNT-TC-1A level 2 in the
appropriate technique.
MT or PT on base material accessible areas shall be performed at 10% per lot (same as
mechanical testing one) for fittings below 12.7 mm and 100% for fittings above 12.7 mm.
MT and PT shall be performed respectively according to ASTM E709 and ASTM E165/E165M.
The wet AC yoke method shall be used.
Acceptance criteria shall be as following;
• ASME BPVC Section VIII Div. 1 Appendix 5 for steel factory made wrought fittings
• ASME BPVC Section VIII Div. 1 Appendix 6 for steel forgings types
• ASME BPVC Section VIII Div. 1 Appendix 8 for non ferritic materials.
All welds shall undergo radiographic examination at final delivery stage (after forming and heat
treatment) in accordance with the reference codes and material standards.
RT on weld before forming is not allowed unless otherwise approved by Company in writing.
MT or PT on weld area shall be performed at 100% per lot.
NDT requirements listed in GS DEL PVV 611 and GS DEL PVV 171 for girth weld in piping
fabrication are also applicable to longitudinal welds. Such NDT shall be carried out by the fitting
Manufacturer.
Hardness testing is also required in case of:
• Sour service (where Specification GS DEL PVV 612 or GS DEL PVV 622 is applicable)
• Stock fittings (see section 12.2)
• When specified in purchase order.

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purpose other than that which it is specifically furnished without the written consent of Dolphin Energy Ltd.
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PMI shall be performed in case of:

• Low temperature condition (on base material and weld inside and outside)
• Stock fittings (see section 12.2)
• When specified in purchase order.

10.4 Mechanical testing

Detailed sketch with location of test sampling shall be provided to Company for approval.

10.5 Repairs of defects

Repair of defects shall only be permitted if performed fully in accordance with the applicable
reference codes and material standards.
Repairs by grinding are allowed provided the wall thickness and dimensional tolerances are not
compromised.
Repair by welding on base material is not allowed.
Repair by welding on welds is allowed provided suitable documentation (WPS) is approved by
Company.

11. Cleaning
Fittings made of the following material:
• Austenitic stainless steels
• UNS N06625 grade1 material
shall be chemically cleaned (pickling and passivation) as per GS DEL PVV 175.

12. Inspection
12.1 Quality control
A fabrication and inspection surveillance plan is required for bulk fittings for Company approval.
The inspection and tests necessary to confirm that the products meet the requirements of the
standards, specifications and requisition shall be carried out in the Manufacturer’s plant by
personnel of the plant. These specially-qualified personnel shall be independent of the
production department of the plant.
Where heat treatment is applicable, uniformity and time of heat treatment shall be verified and
recorded. Furnace shall be compliant to ASTM A991/A991M requirements.
Manufacturer shall ensure material traceability recording from raw material. To this extent,
individual identification for each fitting is required.
Manufacturer shall ensure radiographic examination traceability.
Products shall be guaranteed by an inspection certificate (conformity, material test, etc.). If the
Manufacturer does not have the necessary means of examination, these tests may be
subcontracted at a place approved by Company.

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purpose other than that which it is specifically furnished without the written consent of Dolphin Energy Ltd.
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Quality control inspections shall be conducted in the Manufacturer’s plant so as to make sure of
the proper execution of the order. Quality control inspections shall include the witness of final
shop acceptance.
Quality control activities include dimensional checks and records of each individual welded
fitting.
Unlisted components shall withstand a hydrostatic test without leakage through the fitting wall.
This test shall be performed at the end of the manufacturing process, after final forming and
heat treatment where applicable). Exceptions listed in codes or standards are not acceptable.
Testing procedure shall be submitted for Company approval.

12.2 Acceptance
Quality Control shall not grant any acceptance unless the certificates concerning the products
submitted have been made available to it in advance.
In addition to checking the certificates, Quality Control shall check the quantities presented and
shall have checked, by sampling, the following characteristics:
• NDT reports
• Testing reports
• Delivery condition
• Hydrostatic test report or proof test report or calculation note
• Shapes and nominal dimension
• Dimensional tolerances
• Surface treatment and finish conditions
• Marking.
This sampling shall cover at least 5% of each of the items submitted for acceptance.
For each material grade, product analysis shall be carried out on a fitting selected among the
final products. Product analysis shall include chemical analysis and mechanical tests as detailed
on the material certificate of the final product. Fitting selection shall be carried out by Company
at random and shall be anticipated during the procurement stage.
The production test plan shall be organized to cover as many as possible of the material grades
and sources used for the fabrication of the following systems or lines:
• Process systems
• Lethal services
• Cycling systems
• Systems made of LTCS material, subject to autorefrigeration below -46°C
• Cryogenic systems
• Lines subject to vibrations.

This document is the property of Dolphin Energy Ltd. No part of this document may be reproduced or transmitted in any form or by any means, or used for any
purpose other than that which it is specifically furnished without the written consent of Dolphin Energy Ltd.
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The selection of fittings for testing shall be carried out by Company at random. The selection
shall be organized considering the following criteria:
• Fitting Stockist
• Fitting Manufacturer and manufacturing plant
• Material specification and grade
• Fitting type and diameter
• Fitting schedule or wall thickness
• Ratio of wall thickness to outside diameter
• Minimum design temperature
• Carbon equivalent value (carbon steel only)
• Final heat treatment conditions
• For a same material grade, the ratio of wall thickness to outside diameter is the prime
selection criteria compared to the wall thickness or diameter
• For carbon steel grades subject to PWHT, the PWHT treated condition is the prime
selection criteria selection compared to the as welded condition.
The non-conformity of any or all of the products submitted for acceptance may give rise:
• Either to a second submission after the products have been corrected, if this is possible
• Or to final rejection.
In case of stock procurement, 5% of the fittings shall be PMI and hardness tested verified.

This document is the property of Dolphin Energy Ltd. No part of this document may be reproduced or transmitted in any form or by any means, or used for any
purpose other than that which it is specifically furnished without the written consent of Dolphin Energy Ltd.
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13. Documentation
The following documents shall be supplied to the Company:
Stage From Stockist From Manufacturer when direct order
Inspection Manufacturers Workshop certificate if Raw Materials certificates if required by
required by Company Company
Chemical analysis on product base Reports of the other tests required:
material and weld area if required by Metallographic examination reports…
Company
Dimensional inspection certificates
Hydrostatic tests reports
Heat treatment records if required by
Company
Destructive and non-destructive
examination tests reports
Production tests reports
Final Material Certificates In- Material Certificates
Documentation Reception Reports In-Reception Reports
Certificate of conformity to this
specification

13.1 Certificates of conformity

Certificates of conformity shall deal with this specification and with the ASTM standards
specified in the requisitions for fittings.

13.2 Material certificates

Except if a material certificate EN 10204 Type 3.2 is required by any other applicable
specification or standard, the material certificates shall be of EN 10204 type 3.1 giving the
results of the chemical analysis and of the mechanical tests carried out in accordance with the
requirements of the reference codes and standards.
Material certificates EN 10204 type 3.1 of the mother pipes shall be provided in addition to the
type 3.1 or 3.2 material certificates of the finished products.
The material certificates shall also include additional supplementary requirements or additional
tests, when they are indicated in the purchase order.

13.3 Pressure test certificates

The Manufacturer shall submit EN 10204 type 3.1 pressure test certificates.

This document is the property of Dolphin Energy Ltd. No part of this document may be reproduced or transmitted in any form or by any means, or used for any
purpose other than that which it is specifically furnished without the written consent of Dolphin Energy Ltd.
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14. Use of this General specification

The present document is designed to allow the use of individual Material Data Sheet (MDS) for
procurement and manufacturing stage.
The MDSs identify additional requirements deemed necessary by Company in order for the
materials to meet their intended life of service.

14.1 Material Data Sheets (MDSs)

The material Technical Sheets shall be used as supplementary requirements to existing
Material Specifications (ASTM…).
These reflect the additional requirements of Company imposed on the manufacturers, stockists
and suppliers in order to maintain a quality level that is consistent for the material being
supplied.
The MDSs shall not be used as stand-alone documents for procuring and manufacturing
metallic pipes.
The following minimum information shall be detailed to the manufacturer at bid stage:
• Product description
• Applicable Piping Class
• Service
• Fluid
• Design Pressure and Temperature
• Corrosion Allowance if any
• Dimensions and tolerances
• Quantities with additional materials for qualification testing purposes
• Coating
• Color Coding
• This General Specification requirements
• Any other project requirements.

15. Preparation for shipment

15.1 Markings
Marking shall only be made by the fittings Manufacturer itself.

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purpose other than that which it is specifically furnished without the written consent of Dolphin Energy Ltd.
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15.1.1 Identification of materials

In addition to the markings required by the MSS SP-25 standard, the following information shall
be marked by cold stamping on each fitting:
• Manufacturer’s name or brand
• Specification and grade of material
• Heat number
• Batch number
• Nominal pipe size
• Pipe wall thickness or schedule number.
For sour service applications, additional marking shall comply with the applicable
GS DEL PVV 612 or GS DEL PVV 622.
However, fittings less than 3 mm thick and Copper Alloy fittings shall not be marked by
stamping but by etching.

15.1.2 Markings specific to the order

All fittings shall be identified by marking with color marks and code numbers as and if specified
in the order.

15.2 Protection

15.2.1 Carbon steel fittings

Threaded fitting ends shall be greased and protected by a matching male cap.
Beveled fitting ends shall be protected by a peel-off varnish.

15.2.2 CRA fittings

During cleaning, transport, fabrication, testing and/or storage, all CRA fittings shall be fully
protected against carbon steel contamination and all CRA fittings shall be fully protected against
the risks of saline corrosion.
If paint is used to protect austenitic stainless steel pipes, it shall not:
• Contain chlorides or other substances that might damage these fittings
• Cover the bevels, if any.
When applied, protective coating of fittings shall not be detrimental to welding.

15.3 Packing
Sea-packing shall be used for all fittings and shall be detailed by appropriate purchasing
specification.
In the case of austenitic stainless steel or other CRA material, the packing must also be water-
proof. It shall meet the conditions of all stages of transport (rail, road, air and sea).

This document is the property of Dolphin Energy Ltd. No part of this document may be reproduced or transmitted in any form or by any means, or used for any
purpose other than that which it is specifically furnished without the written consent of Dolphin Energy Ltd.
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Bibliography
Reference Title of the publication
ASTM A105 Standard Specification for Carbon Steel Forgings for Piping
Applications
ASTM A182 Standard Specification for Forged or Rolled Alloy and
Stainless Steel Pipe Flanges, Forged Fittings, and Valves
and Parts for High-Temperature Service
ASTM A234 Standard Specification for Piping Fittings of Wrought Carbon
Steel and Alloy Steel for Moderate and High-Temperature
Service
ASTM A350 Standard Specification for Carbon and Low-Alloy Steel
Forgings, Requiring Notch Toughness Testing for Piping
Components
ASTM A370 Standard Test Methods and Definitions for Mechanical
Testing of Steel Products
ASTM A403 Standard Specification for Wrought Austenitic Stainless
Steel Piping Fittings
ASTM A420 Standard Specification for Piping Fittings of Wrought Carbon
Steel and Alloy Steel for Low-Temperature Service
ASTM A530 Standard Specification for General Requirements for
Specialized Carbon and Alloy Steel Pipe
ASTM A960 Standard Specification for Common Requirements for
Wrought Steel Piping Fittings
ASTM B466 Standard Specification for Seamless Copper-Nickel Pipe
and Tube
ASTM B467 Standard Specification for Welded Copper-Nickel Pipe

This document is the property of Dolphin Energy Ltd. No part of this document may be reproduced or transmitted in any form or by any means, or used for any
purpose other than that which it is specifically furnished without the written consent of Dolphin Energy Ltd.