OISD/DOC/06/2024/19

OIL INDUSTRY SAFETY DIRECTORATE

- 163

SAFETY OF CONTROL ROOM FOR

HYDROCARBON INDUSTRY

OISD - STD
TD - 163

Inception September 1996

Amended Edition September 2001
1st Revised Edition September 2004
2nd Revised Edition June 2024

FOR RESTRICTED CIRULATION ONLY

OIL INDUSTRY SAFETY DIRECTORATE

Government of India
Ministry of Petroleum & Natural Gas
8th Floor, OIDB Bhavan, Plot No. 2, Sector 73, Noida 201301 (U.P.)
Website: https://www.oisd.gov.in Tele: 0120-2593833
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Page No. I

PREFACE

Indian petroleum industry is the energy lifeline of the nation and its continuous performance
is essential for prosperity of the country. As the industry deals with inherently inflammable
substances throughout its value chain upstream, midstream and downstream Safety is of
paramount importance to this industry as safe performance at all times can ensure optimum
return of these national assets and resources including sustainability.

To ensure proper implementation of the various aspects of safety in the oil & gas industry, the
Government of India, vide Resolution No. R-13013/4/84-OR-1 1 dated 10th January, 1986 set
up a Safety Council at the apex, under the administrative control of the Ministry of Petroleum
& Natural Gas (MoP&NG). To assist the Safety Council, a technical directorate, namely the
Oil Industry Safety Directorate (OISD) under the aegis of MoP&NG, has been entrusted with
the responsibility of formulating standards, overseeing ng its implementation through safety
audits to enhance safety level in the oil & gas industry.

OISD has developed a rigorous, multi-layer, layer, iterative and participative approach for
development of standards. OISD develops and revises Standards, Guidelines &
Recommended Practices for the oil and gas sector through a participative process involving
all the stakeholders, drawing inputs from national and international standards and adapting
them by leveraging the experience of the functional committee. These standards cover inbuilt
design safety, asset integrity and best operating practices in the field of production,
processing, storage and transport of petroleum.

The participative process followed in standard formulation has resulted in excellent level of
compliance by the industry. It also goes to prove the old adage that self
self-regulation is the best
regulation. The quality and relevance of OISD standards had been further endorsed by their
adoption/ reference in various statutory rules and regulations of the land.

OISD and industry together strive to achieve nil incident in the entire hydrocarbon value chain.
We at OISD, are confident that the provisions of this standard, when implemented in totality,
would go a long way in ensuring safe operation in the oil and gas industry.

Executive Director
Oil Industry Safety Directorate
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Page No. II

NOTE

Oil Industry Safety Directorate (OISD) publications are prepared by the Oil and Gas industry
under the Ministry of Petroleum & Natural Gas. This standard is a property of Oil Industry
Safety Directorate (OISD) and shall not be reproduced or copied and loaned or exhibited to
others without written consent from OISD.

OISD standards are published to facilitate sound engineering, operating practices and aimed
to supplement the information to the oil and gas industry, however this may be used by anyone
desiring to do so and are not intended to obviate the need for applying g sound engineering
judgement regarding when and where these standards should be utilized. The formulation and
publication of OISD standard is not intended in any way to inhibit anyone from using any other
practices and not to replace the prevailing statutory
ory requirements, which must be followed as
applicable.

Wherever Acts/ Rules/ Regulation and National/ International Standards are mentioned in the
standard, the same relates to in-vogue
vogue version of such documents. Whenever there is any
difference between the statutory norm and OISD standard, more stringent requrequirement should
be followed. However, in case of any difference in the requirement between OISD standards,
the requirement as specified in the standard released at a later stage shall prevail.

The industry has to carry out gap analysis and make necessary changes in their system in
line with the revised standard and the requirement should be implemented within a time frame
of 1 year (from the date of release of revised standard).

Though every effort has been made to assure the accuracy and reliability of the information
contained in these documents, OISD hereby expressly disclaims any liability or responsibility
for loss or damage resulting from the use of OISD standard.

The standards would be reviewed periodically based on the decision in the Steering
Committee/ Safety Council, industry request, technological development, recommendations of
high level committee and accident investigation reports. Generally, OISD standards are
reviewed and revised, reaffirmed or withdrawn at least every ten years.

Suggestions for revision are invited from the oil and gas industry and should be submitted to
OISD at ps-ed.oisd@gov.in.
ed.oisd@gov.in
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CURRENT FUNCTIONAL COMMITTEE

Name Organization
Team Leader
Dr. Sudip Paul Engineers India Limited, New Delhi
Members
Satheesh V.C. Oil and Natural Gas Corporation Limited, Uran
Ashis Kr Chattopadhyay Indian Oil Corporation Limited, HSE, ERO
Anup Samantaray Indian Oil Corporation Limited, LPG
S N Soman Hindustan Petroleum Corporation Limited, Mumbai
Ashok Kumar Hindustan Petroleum Corporation Limited, Mumbai
D Das (Retired) Bharat Petroleum Corporation Limited, Mumbai
Samiron Naba Saikia Oil India Limited, Duliajan
Nirmalya Nandi Bharat Petroleum Corporation Limited, Bina
Jayesh H Gosalia Petronet LNG Limited
Jayesh Kumar Amrutiya Nayara Energy
Anshul Tiwari HMEL, Bhatinda
Muthukumaram Sambandham CAIRN, Rajasthan
Saurabh Kumar Arya Oil Industry Safety Directorate, Noida
Sanjay Kumar Tiwari Oil Industry Safety Directorate, Noida
Manish Kumar Lenpale Oil Industry Safety Directorate, Noida
Member Coordinator
Harendra Kumar Yadav Oil Industry Safety Directorate, Noida (Till 27.04.2023)
Shathish Kumar S Oil Industry Safety Directorate, Noida (Since 28.04.2023)
.

OISD also recognize the support & cooperation of several other experts from industry, who contributed to
the preparation, review and finalization of this document
document.
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Page No. IV

TABLE OF CONTENTS

1.0 INTRODUCTION ..........................................................................................................1

2.0 SCOPE ............................................................................................................................1
3.0 DEFINITIONS................................................................................................................2
4.0 GENERAL REQUIREMENTS ......................................................................................3
4.1 CONTROL ROOM FUNCTIONS .................................................................................3
4.2 CONTROL ROOM BUILDING ....................................................................................3
....................
4.3 LAYOUT & TYPE OF CONSTRUCTION ...................................................................4
................................
4.4 NOISE LEVELS .............................................................................................................5
................................
5.0 SAFETY REQUIREMENTS..........................................................................................5
..........................................................
..........................................................
5.1 LOCATION ....................................................................................................................5
................................
5.2 ARCHITECTURAL PLANNING..................................................................................6
................................
5.3 ELECTRICAL REQUIREMENTS ................................................................................7
................................................................
................................................................
5.4 INSTRUMENTATION REQUIREMENTS ................................
..................................................................8
5.5 AIR CONDITIONING ...................................................................................................8
................................
5.6 GENERAL REQUIREMENT ................................
........................................................................................9
6.0 FIRE PROTECTION SYSTEM ................................
...................................................................................10
6.1 FIRE WATER...............................................................................................................10
................................
6.2 SMOKE/ HEAT DETECTION SYSTEM
SYSTEM....................................................................10
6.3 CLEAN AGENT FIRE EXTINGUISHING SYSTEM ................................................10
6.4 EVACUATION IN EMERGENCY .............................................................................12
6.5 FIRST AID FIRE EQUIPMENT
EQUIPMENT..................................................................................12
7.0 PERSONAL PROTECTIVE EQUIPMENT ................................................................12
8.0 STRUCTURAL SAFETY ............................................................................................13
9.0 RETROFITTING OF EXISTING CONTROL ROOM: ..............................................19
10.0 ABBREVIATION
ABBREVIATION.........................................................................................................20
11.0 REFERENCES .............................................................................................................22
ANNEXURE I SELECTION OF THE TYPE OF CONSTRUCTION FOR CONTROL
ROOMS(PLANT / UNIT) .......................................................................................................23
ROOMS
ANNEXURE II LIMITING ROOM/ SPACE FOR A CONTROL ROOM 25
ANNEXURE III ESSENTIAL LAYOUT REQUIREMENT OF CONTROL ROOM. 26
ANNEXURE-IV MAJOR CHANGES IN REVISED EDITION .. .25
ANNEXURE-V PREVIOUS FUNCTIONAL COMMITTEE(S) DETAILS 26
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1.0 INTRODUCTION

complex plants presents substantial risk potential. The oil & gas industry over the years learnt
lessons from fires and explosions throughout the world and has been updating plant safety norms.
Control room safety has vital importance to plant operations and operating personnel working in
proximity of risk areas.
Whenever new Units are coming up in existing plant; controls & communication services for the
same is being planned to accommodate in the existing control room & satellite rack room. oom.. In such
oom
scenarios, the existing control room & satellite rack room to be modified/ retrofitted to the type/
category based on the requirement as given in this standard,, if there is a change in risk quantum.
quantum In
this regard, a brief guideline for conversion of non-blast resistant control room
oom & satellite
satellite rack room
buildings to blast resistant control room & satellite rack room buildings are given in section 9.0.

If an entity before the commencement of this standard has constructed, kept under construction or
expanded the facility based on some other standard or is not meeting the requirements specified in
this standard,, the entity shall carry out a detailed Quantitative Risk Analysis (QRA) of its
infrastructure and the entity shall thereafter take approval from its highest decision making body or
its board for non-conformities and mitigation measures.
However, if the requirement as enumerated in any applicable rules or regulations is more stringent
than specified in this standard, same shall be followed.

2.0 SCOPE
This standard lays minimum requirement(s) for prevention of damage to control and communication
system located within the controlntrol room from accidental fire
fire/ blasts and also ensuring protection to
personnel working inside the control room. The requirements of this standard are applicable to control
room and satellite rack room in p petroleum
etroleum refineries, oil/ gas production, storage & process plants,
petrochemical
etrochemical plants, LNG storage & handling and regasification plant, marketing terminals, LPG
filling plants/ terminal, pipeline
ipeline installations (including pumping/ compressor stations) etc. subjected
to the following:

a) This document does not cover the safety requirements of control rooms for DM plant operations
where nitrogen facility is not included.

b) This document does not cover the safety requirements of control rooms for offshore
installations.

c) For temporary Well Head Installation (WHI), Quick Production Setup (QPS Early Production
Setup (EPS), criteria for Control Room safety should be decided on case-to-case basis, based
on Risk Study/ QRA of the installation.

d) Data Center for facilities as mentioned in scope above without any automatic control or
shutdown safety system and having data acquisition & display systems or Operator Cabin/
Office Building are not considered as Control Room for the purpose of this document.
e) This document defines the criteria for sizing, locations and selecting the type of construction of
control room buildings for the facilities mentioned above.
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Detailed design procedures are not included in this document and shall be as per relevant codes of
practice of Bureau of Indian Standards (BIS) and other applicable codes of practice and NFPA, ISA
and other applicable international safety standards.

However, few guidelines specially related to structural detailing have been outlined in this standard
which shall be followed in addition to all design requirements as per relevant BIS standards.

In case of conflict/ contradiction, the stringent requirement shall prevail.

3.0 DEFINITIONS
3.1 CONTROL ROOM

control & safety systemss and/

and/ or environmental
treatment necessary for proper functioning of the Hydrocarbon Processing and Handling Installation.
The control room could either be blast-resistant or non-blast
blast resistant as applicable to the type of
installation. (API/ or source).

3.2 SATELLITE RACK ROOM (SRR)

The Satellite Rack Room (SRR) contains the cable termination, DCS and PLC controllers, power
supplies etc., necessary for controlling the plant. The same is considered for physical placement of the
hardware where the distances from the various process unitsunits limits the easy transmission of process
signals directly to the control room.

3.3 BLAST-RESISTANT BUILDINGS

-
effects of an incidental explosion giving rise to the pressure/ time effects. In resisting such explosion,
the building may suffer damage provided that this does not result in collapse, danger to personnel or
render control equipment inoperable. However, capable of withstanding a static incident (side-on)
overpressure of 3 psi due to pressure/ time effects of explosion, the building shall remain gas
gas-tight for
preventing ingress of contaminated air following explosion.

3.4 ENGINEERING ROOM

Rooms where engineering consoles are kept and are used to carry out engineering activities
ac with
respect to control/ shutdown system.

3.5 HAZARDOUS AREAS

Hazardous areas are the areas encompassing storage tanks, equipment, piping manifolds, valves etc.
where hydrocarbon vapors and radiant heat hazard exists.
Area shall be deemed to be a hazardous area, where
(i) Petroleum having a flash point below 65 oC or any inflammable gas or vapour in a concentration
capable of ignition is likely to be present.
(ii) Petroleum or any inflammable liquid having a flash point above 65 oC is likely to be refined, blended,
handled, stored at above its flash point.
For classification and the extent of hazardous area, refer Petroleum Rules-2002.
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3.6 SHALL

3.7 SHOULD

3.8 MAY

are to be considered desirable or good practices which are encouraged to implement but not
necessary.

3.9 PEAK INCIDENT (SIDE-ON) OVERPRESSURE

Blast
last wave is characterized by either an instantaneous or gradual rise in pressure ((above ambient
atmospheric condition) to a peak incident (side-on) overpressure and gradually returns to ambient.

3.10 STATIC INCIDENT (SIDE-ON) OVERPRESSURE

incident (side-on)
on) overpressure to be considered for static analysis due to blast wave loading.
loading

4.0 GENERAL REQUIREMENTS

4.1 CONTROL ROOM FUNCTIONS

Control Room serves the following functions:

(i) Control station for operation/ safety/ monitoring of various facilities involving process, utilities,
boosting & delivery operation of upstream and downstream sector for POL, LPG and LNG
transportation in hydrocarbon industry.

(ii) Process inventory controls.

(iii) All emergency and Start-up/

Start Shutdown controls.

(iv) Establishing Communication

Comm facilities including Telephone/ VHF/ Voice mail/ Plant
communication, internet services and CCTV as applicable.

4.2 CONTROL ROOM BUILDING

Both types of control room buildings as defined in 4.3, shall have provisions for only required services.
Conference hall pertaining to admin activities, library etc. where assembly of people other than O & M
are not allowed.

The building can accommodate:

(i) Console room and Rack rooms

(ii) Computer room

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(iii) UPS room

(iv) AC plant and AHU room

(v) Battery room with battery charger sets.

(vi) Clean agent cylinder room / Fire extinguishing system.

(vii) Offices for Officers and supporting staff directly involved in Operation & maintenance of plant.
Sitting arrangement for staff directly involved in operation and maintenance of the Unit/ units for
which control room is intended.

(viii) Essential services such as instrument calibration facility, Engineering Room and Optimization
Room/ computers & advanced control room.

(ix) Essential amenities: Locker room, discussion room pertaining to only O&M,
&M, Record room, Dining
room, toilet etc.

(x) The control room shall cater for minimum essential occupancy. Similarly, sub-station
sub block when
combined with control room shall have space only for essential requirement.

(xi) A set of emergency tools should be stored for use in an emergency.

emergency

4.3 LAYOUT & TYPE OF CONSTRUCTION

Control room and Satellite rack room should be preferably single-storey construction for blast resistance
type. Where multi storey blast resistance construction is required, the floor plan and elevation preferably
shall have clean rectangular profiles without re-entrant
re entrant corners, recessed areas and total nos. of escape
route shall be planned for evacuation similar to that of a single
single-storied structure including provision for
ramps etc.

The type of construction shall be based on the table provided under Annexure
Annexure-I. In case other than
those listed in Annexure-I,
I, the type of construction shall be decided after appropriate QRA/ RRA study.
In order to provide sufficient resistance to sustain generated blast pressures, based on risk category
and placing/ seating of the control room on plot, any one of the following types of construction shall be
adopted:

Type-A (Non-blast
blast resistant)
The construction will be with ccolumn-beam frame having concrete floor/ roof slab and brick filler walls
structurally suitable for design loads. Control room building can have multistoried option.

Type-B
B (Blast resistant)

The construction (column-beam and external wall or any other framing system) will be RCC type
structurally suitable for design loads.

The minimum thickness for roof slab and external wall shall be as per section 8.4.

All openings on peripheral wall (for cable entries) shall be through Multi Cable Transit (MCT) with proper
(equal grade as for structural works) concrete plugging.

It is assumed that the structure shall be subjected to blast loading only once in lifetime of the structure.
This means the structure shall withstand the design blast load without local / global collapse and after
the occurrence of blast, even if the control room building visibly remains un-affected, proper structural
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assessment shall be carried out by competent agency for assessment of re-use of the control room
building structure.

Essential facilities to be included in the control room (both Type A & B) are indicated under Clause 4.2.

Limiting room/ space and essential layout requirements for a control room are also brought out in
Annexure-II and Annexure-III.

4.4 NOISE LEVELS

Noise level in the building shall not be allowed to exceed the following limits:

Control rooms not continuously manned -------- 60 dB (A)

Control rooms continuously manned -------- 50 dB (A)

The reflected noise level shall be reduced by providing acoustic ceiling and acoustic material on the
upper part of the walls wherever necessary.
In case of impulsive and/or tonal character noise, the above limits shall stand reduced by 5 dB (A).
Noise from Heating Ventilation & Air-conditioning
conditioning (HVAC) equipment transmitted through ducts shall
not result in sound pressure levels inside the room higher than 10 dB (A) below the maximum
acceptable noise level in that room.
Noise that is not related to equipment but is produced by use of various areas need not be considered.

5.0 SAFETY REQUIREMENTS

5.1 LOCATION

Control room should be located in a nonnon-hazardous area, predominant upwind of process plants/
hydrocarbon storage and handling facilities. It shall further be sited away from areas of congestion and
confinement in order to reduce the severity of the explosion. It shall not be located on a lower level than
surrounding plants and tank farms. There shall be no structure that would fall directly on the control
room in case of a blast.

The location of the control room and its separation distances from process units/ block facilities shall
be as per OISD-STD
OISD-STD-
OISD

Based on expected risk from the sources, the control room building shall be located on the plot and
type of construction assigned (refer Clause 4.3).

Unless otherwise required from plant processing considerations, the structural design of Type-B control
rooms shall be undertaken for a minimum static incident (side-on) overpressure of 3 psi. Further, details
of design pressure consideration for structural design shall be as per section 8.0.

Though from design consideration vapour cloud explosion shall be considered on all faces on a blast
resistant building, it is still desirable to have the building orientation such that possible explosion source
shall face minimum side of the building.
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5.2 ARCHITECTURAL PLANNING

5.2.1 GENERAL CONSIDERATIONS

The following are recommended for all types of control rooms:

(i) Control room preferably of one storey above grade construction to facilitate quick evacuation in
emergency and shall cater for minimum essential occupancy.

(ii) Where the control room and sub-station

station buildings are to be located side by side, the type of
construction of the Control room shall be as per Clause 4.3. Fire protection facilities for sub-
sub
sub-station
-station
and related equipment/ and Location of transformer shallll be in line with OISD-STD-173
OISD-STD
OISD- STD-173
173 (Fire
Prevention and Protection System for Electrical Installations). However, the location of transformer
shall not pose any additional fire/ explosion hazard to control room.

(iii) Even in the case of sub-station being located adjacent to the control room, the blower room &
AHU of Control room shall be located within the external walls of control room. However, for
pressurization requirement of sub-station, the blower should be located in the sub-station
sub itself.
Exceptions, if necessary, may be considered on a case-to-case
to-case
case basis. AHU and blower room
should be located on the far side of the process plant.

(iv) Access Control System for a control room should be provided as per organizational requirements

in view the safety of personnel inside the control room

room. Emergency exit should open to the safe
area with free of obstruction.

(v) Control room entry should have double doors.

doors The air curtain facility at inner door may be
considered to prevent any hydrocarbon and dust entry inside the control room.

(vi) Toughened and shatter proof glass shall be used for doors/ windows in control rooms.

(vii) Adequate ventilation shall be maintained in the control room with a minimum of five air changes
per hour or as specified in the state factories rules whichever is higher. The purge air shall be
drawn from an electrically safe classified area.

(viii)No
No equipment other than essential for control room functioning shall be placed on the roof.
However, any essential equipment (including solar panel) if placed should not affect stability of the
building structure.

(ix) Air-intake
intake system, exhaust stack, drinking water tanks and cooling tower of HVAC system should
preferably be located on roof plan in such a manner that these facilities are on far side of process
plant and away from the access/ exit locations. Those facilities should not obstruct the access/exit
locations.
locations

(x) Access from outside to the control room building shall have ramp access. This is in addition to
steps, if provided.

(xi) A minimum of two exits shall be provided in such a way that each has a different unobstructed
escape route. These routes as well as emergency exits shall be properly identified and displayed.
This shall be as per the National Building Code and relevant statutory provision.

(xii) The drainage system for control room building shall be provided with suitable traps to prevent
back-flow of explosive vapors during plant upset or spills. The floor level of the building (including
the floor supporting the false flooring) should be higher compared to the grade level outside the
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building. However, the level of false flooring and flooring levels of other rooms and facilities of
control room except washroom should be at same elevation.

5.2.2 CONSIDERATIONS SPECIFIC TO BLAST-RESISTANT CONTROL ROOM

The blast resistant control room shall comply with following additional requirements:

(i) The openings through walls shall not exceed seven percent (7%) of wall area. (refer Annexure-
III). The area of each window shall not exceed 0.25 m 2. The glass used for windows shall be
toughened & shatter-proof
proof of 7 psi rating. Window slits shall be vertical with slit width not exceeding
0.30 m.

(ii) Number of doors provided shall be minimum so that positive pressure can be maintained inside
the control room. Doors shall be designed as blast resistant (not only fire resistant).

(iii) The entries/ exits to the control room shall have the least resistance escape route with least
exposure to hazardous area.

(iv) Any entry to the control room building shall be protected with baffle wall of blast
blast-resistant
construction with suitable overlap on both sides against entry of direct blast pressure wave. Baffles
shall be at 45 degree/ 90 degree to the access way (refer
efer Fig. below)
below):

Blast Door
Blast Door

>d d >d

(v) Fire-resistant
resistant partition/ Isolation shall be provided between various risks where fire protection is
provided to prevent spread of fire to the adjoining protected areas. Doors, if provided between
protected areas, shall be fire & blast resistance.

5.3 ELECTRICAL REQUIREMENTS

The following safety features are to be adopted:

(i) Emergency lighting (AC/ DC) at strategic locations in the control room and rack room shall be
provided in order to facilitate safe shutdown/ escape from control room during emergency.

(ii) Portable flameproof emergency lights should be provided in the control room in addition to fixed
one mentioned in point no.(i).

(iii) Adequate communication system such as VHF/ UHF/ WLL Phone/ Hot-line telephone link shall
be provided at strategic locations within control room with emergency power back-up.
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(iv) Paging system with tone generators or any suitable plant communication system should be
provided for alerting working personnel in the plant. Also, a suitable manual fire warning system
should be provided.

(v) Flame proof Exhaust fan shall be provided in the Battery Room. Electrical fittings used inside
Incase, Sealed Maintenance-Free (SMF)
batteries or Valve-Regulated Lead-Acid batteries are provided which are not emitting hydrogen,
the manufacturers recommendations for electrical fittings protection shall be complied with.
Battery room shall have fixtures mounted on wall in order to facilitate easy replacement of fused
lamps. Switches controlling the lighting fixtures and exhaust fan shall be installed outside the
battery room. .

(vi) Electrical fittings provided in the control room shall be as per hazardous area classification in line
with statutory provision or OISD-STD-113
113 or latest guidelines of DGMS as applicable.

(vii) Close circuit TV system may be provided based on requirement.

5.4 INSTRUMENTATION REQUIREMENTS

The following safety features shall be incorporated in the control room design:

(i) Adequate clearance between cabinets/ racks and wall of control room shall be provided for proper
access to the equipment during testing/ maintenance. Minimum distance of 1m between
equipment to wall of control room and minimum distance of 2m in aisle is recommended at exit
corridors.
(ii) Where console and rack/ cabinet are located in the same room, the console shall have a minimum
aisle space of 2m from control panel or rack/cabinet.
(iii) Toxic gas detector as applicable and Hydrocarbon detector shall be provided in the air-intake
air duct.
On actuation of detector,, it shall simultaneously give an alarm, close the damper and cause
tripping of the AHU.
(iv) Indication of online hydrocarbon / toxic gas detectors should be available with alarm in the Process
Control room. Additionally, a minimum of 2 nos. of portable gas detectors shall be provided in the
control room.
(v) Real time Air Quality Monitoring units with sensors for Corrosion, Temperature,
Temp Humidity may be
installed in Control Room/ Rack Room to monitor the environmental condition for Process
Measurement & Control System as per ANSI/ ISA S71.04. Air Purification System, as required
Measureme
may be installed in Control Room to maintain GG-3 environment (corrosion rate of electronic items)
as per ANSI
ANSI/ ISA S71.04 as minimum.

5.5 AIR CONDITIONING

The following safety features shall be adopted in the design of air conditioning system of control room
wherever centralized air conditioning system is provided:
(i) A separate supply and return air ducting shall be provided for control room.
(ii) Dampers shall be installed in ducts, where they pierce fire walls or at the point the duct(s) emerge
from air conditioning plant room. These dampers must have 90 minutes fire rating (resistance) and
may be of single blade/ multi blade design pneumatically operated and actuated by smoke detector
units.
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(iii) With operation of the automatic (smoke/ hydrocarbon/ toxic gas) detector within the air duct, the
supply and return air ducts must be cut-off and the air conditioning plant to be tripped.
(iv) Air intake point shall be located preferably on the opposite side of the process units. Fresh air shall
be drawn from an electrically safe classified area as away as possible but not less than 16 m from
area processing hydrocarbons and other gases. Chemical filter of suitable design should be
installed at fresh air intake.
(v) Control room should be pressurized and maintained at 3-5 mm WC, if it lies within hazardous area
classified as per statutory provision or OISD-STD-113
113 or latest guidelines of DGMS as applicable.
(vi) Positive pressurization shall be maintained where specifically called for by modulation of fresh air,
relief and return dampers. Pressurization being the primary requirement, its system shall have a
100% % auto standby system including fan, filter, relief dampers etc. Alarm (visual & audio) shall
occur on loss of pressurization.
To purge space of undesirable air, the fresh air damper shall be fully open. When positive
pressurization is a critical requirement, the return air damper of AC system shall be in a closed
position. The remote relief dampers will modulate open to exhaust the purge air. The purge cycle
shall occur upon start-up and upon a loss of pressurization.. All operations shall be automatic.
(vii) Separate mechanical purge system is also acceptable to meet the desired intent. Care shall be
taken to adequately purge the space prior to energizing non
non-explosion
explosion proof electrical equipment.
(viii) Purge cycle should operate a minimum of five air volume changes per hour or as specified in the
state factories rules whichever is higher to assure a complete purge. The purged air shall be drawn
from an electrically safe classified area.
(ix) Ducts under negative pressure shall be free of leaks and given suitable protection from mechanical
damage and corrosion to prevent hazardous concentrations of flammables from being admitted to
the control room.
(x) AC plant/ AHU room shall be ventilated with a minimum of fifteen air changes per hour.

5.6 GENERAL REQUIREMENT

(i) Instrumentation & electric cable entry to the control room shall be made through identified cable
transit blocks or any other medium which are liquid
liquid-and-vapour-tight and also fire resistant. All
spare cable entries shall be properly sealed.
(ii) In case of blast resistant design of control room, adequate cable transit blocks with dummy blocks
shall be provided for future expansion.
(iii) Protection against rat
rat/ lizard/ reptile menace shall be incorporated through periodic pest control
and proper sealing at vulnerable points.
(iv) Eye washer facility should be provided near the battery room for acid batteries.
(v) First-aid box should be provided in CR and SRR
(vi) Single line schematics highlighting the power supply sources to the instrumentation/ DCS etc.
should be available in the control room for ensuring positive electrical isolation of the circuit to be
worked upon. Any modification/ change should be incorporated in the document as part of
Management of Change (MOC).
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6.0 FIRE PROTECTION SYSTEM

6.1 FIRE WATER

Control room building from outside shall be provided with hydrant coverage. The number of hydrants
provided shall be in line with OISD-STD-116/ 117, whichever is applicable.

6.2 SMOKE/ HEAT DETECTION SYSTEM

(i) Smoke detectors along with audio-visual
visual fire alarm system shall be provided in the control room
building/ SRR building to cover operator area, rack room, UPS room, cable cellar, documentation
room and engineering room and passage area where smoke and hot spot could develop.
(ii) Control Room/ SRR and other rooms in building with false floor and false ceiling should be divided
into three zones, viz Area above false ceiling, operating floor, area below false floor floor. Smoke
detectors shall be installed in all these areas. Repeat indication for smoke detector above false
celling and below false floor should be provided in the visible location in the control room.
(iii) System shall be designed to detect incipient fire, smoky fire and flaming fire and generate audio
& visual alarm in case of smoke or fire is detected.
(iv) In addition to audio/ visual alarm in Smoke Detection Panel, system should actuate EXIT SIGN
display board, installed in protected area. EXIT SIGN board should have text/ direction printed in
both sides.
(v) Smoke/ fire Detection system should actuate hooter on detection of fire/ smoke. Hooter should
have minimum 100 DBA A output measured at 1 meter distance.
(vi) Repeat alarm for the Smoke/ Fire detection system to be provided in the fire control room or any

(vii) In case of unmanned control room/ SRR, a repeat alarm in its associated manned control room
shall be actuated on detection of smoke/ fire, in addition to alarm in Smoke Detection Panel in
protected area.
(viii) Smoke/ fire Detection Panel should have facility to test Lamp, Hooter, Flasher and carry out
function tests.
(ix) The battery room and storage room shall be provided with heat detectors. Detector should cover
area above false ceiling, operating floor, area below false floor including cable cellar.
(x) Smoke Detection System should have a dedicated backup power supply (battery power). This
should be sufficient to operate a local control station with all detectors, alarms and manual
interfaces for 24 hrs standby operation. Backup power supply should be suitable for a minimum
of 15 minutes full load operation during a fire and emergency condition. Periodic health check-up
of this back up power supply to be done and record to be maintained.
(xi) All Cables/ wires of Smoke Detection System shall be FRLS (fire retardant low smoke).

6.3 CLEAN AGENT FIRE EXTINGUISHING SYSTEM

(i) Clean Agent based fire suppression system should be provided in Control Room, including
Satellite Rack Room (SRR) and Engineering Room. This Clean Agent system shall be designed
and installed as per OISD-STD-116 / NFPA-2001/ EN 15004 / ISO 14520 (latest edition).
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(ii) System should be designed to flood entire area - area above false ceiling, operating floor, area
below false floor. It is preferable to divide cabinets into zones and direct the clean agent into the
cabinets of affected zone. Areas protected by having clean agent flooding provision shall be
segregated from unprotected areas with fire safe partition.
(iii) Quantity/ concentration of clean agent shall be designed so that the actual concentration of the
clean agent in the normally occupied control room area

(iv) Clean Agent cylinder should have 100 % standby. Both primary & standby cylinder banks should
be permanently connected to distribution pipes and should be easy for changeover.
(v) Outside each hazard under protection, Manual Release Push Button is to be provided for
emergency release of gas. Additionally Abort switch is to be provided outside each hazard to hold
the release of clean agent during small fires or any maintenance work inside the room.
(vi) Hooter and Flasher should be provided which will give Audio-Visual indication for gas release &
evacuation of people inside room under fire.
(vii) The operation of the warning devices shall be continued after agent discharge until positive action
has been taken to acknowledge the alarm.
(viii) Sequence of operation of Fire Suppression System and procedure for actuation & evacuation of
control room shall be displayed in Clean Agent Panel Room and near ABORT station (at
Emergency Exit). Warning and safety instruction signs shall be located such that they will be
readily visible to personnel in the protected area.

(ix) The clean agent system shall be actuated automatically by the signal received from the Smoke/
Fire Detection System, after detecting the smoke/ fire in the protected area/ zone.
Clean Agent System should have provision for the following mode of operations:

- Automatic release on smoke/ fire detection

detection.

- Manual release button for activation.

- Manual release provision at Clean Agent Cylinder Room.

Room

(x) Automatic
omatic actuation shall be on a delay
d from smoke detection with Pre-Discharge alarm.
(xi) In manned areas inside control room, the clean agent flooding operation should be kept on manual
mode and to be operated manually based on detection of fire/ smoke in the protected area/ zone.
(xii) In
In unmanned area of control roomroom/ unmanned SRR, in addition to automatic actuation of clean
agent flooding on smoke detection, all manual operation mentioned above should be possible.
All the initiation/ actuation sequence including alarm on smoke detection, delay sequence for
evacuation and Abort should be in place for unmanned area also. External hooter and/ or alarm
in manned control room or Fire Control Room shall be actuated on initiation of sequence of fire
suppression system in any unmanned control room/ SRR.
(xiii) Forced-air ventilating system including self-contained air recirculation system, shall be shut down
or closed automatically on actuation of clean agent release mechanism, where its continued
operation would adversely affect the performance of the fire extinguishing system or result in
propagation of the fire.
(xiv) Clean Agent Cylinder & Panel Room shall have direct Exit from the building or have easy access
to Emergency Exit of Control Room.
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(xv) Clean Agent Control System should have backup power supply for 24 hrs. standby operation. In
the unlikely event of complete electrical power failure, the system should be capable of activation
and flooding by the manual pull lever at cylinder room.
(xvi) Clean Agent cylinders shall have valid approval of PESO as per Gas Cylinder rule and follow the
maintenance as per OISD-STD-142.
(xvii) All Cables/ wires of Clean Agent System shall be FRLS.

6.4 EVACUATION IN EMERGENCY

To facilitate evacuation of personnel during emergency:

(i) Assembly points (as identified under disaster management plan) shall be
e displayed in the control
room and strategic location.
(ii) Boards should indicate the guidelines to be followed for safe evacuation.
(iii) Fluorescent strips should be provided along the emergency exit route of the control room building.
Emergency exit route shall be unobstructed by any material, equipment etc.
(iv) Personnel shall be trained in the use of self-contained
contained breathing apparatus and periodic mock drills
should be conducted for efficacy of safe evacuation plan.
(v)In case access control is provided, provision shall be available to ensure opening of the door for
emergency exit & entry even or automatic defunct the system in case of power failure.

6.5 FIRST AID FIRE EQUIPMENT

Following First Aid Fire Equipment shall be provided in the control room in line with OISD-STD-116/
117:
(i) DCP fire extinguishers,, Portable CO2/ Portable clean agent fire extinguishers shall be provided in
the control room and engineering room, office area etc.
(ii) The number of equipment shall be decided on case
case-to-case basis depending upon size of control
room and number of personnel in the control roo
room or the same has specified in OISD-STD-
116/117.
(iii) Type of fire-extinguisher
fire extinguisher suitable for firefighting as per OISD-STD- 116/117.

7.0 PERSONAL PROTECTIVE EQUIPMENT

The personal protective equipment shall be considered for control room in line with OISD
OISD-STD-155.
This should include following as applicable:

(i) Self-contained Breathing Air Apparatus

(ii) Suitable canister masks as per identified hazards.
(iii) Acid proof aprons and safety goggles in the battery room.
(iv) Safety wears for handling fire-scavenging material as per manufacturers' recommendations.
(v) Water-gel Blankets are available in the vicinity.
(vi) Fire suit/ Cryogenic suit as per requirement.
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8.0 STRUCTURAL SAFETY

8.1 GENERAL

This section specifies the methodology of structural analysis and design of Type-B Control Room (CR)
& Satellite Rack Room (SRR) buildings to resist the blast load due to explosion of unconfined vapour
clouds in the plant (hydrocarbon industry).
The main objective is to keep buildings functional in case of such explosion and thus, ensuring proper
post explosion emergency actions in order to restrict the extent of damages of the plant. Building shall
be designed to experience only one time blast loads in its design life span. However, after the blast
blast, the
building shall be thoroughly inspected and health study with all required non-destructive
destructive tests shall be
conducted and all necessary retrofitting shall be performed (refer Section 9.0). Strength an and stability
fitness certificate to be obtained for reuse of the building.
Analysis and design of CR & SRR buildings for other load cases like wind, seismic etc. are similar to
regular design of RCC buildings under these load cases and combinations based on relevant Indian
Standards (IS 456 etc.) as applicable.

8.2 INPUT DESIGN LOADS

Following loading input is required for Blast Resistant design criteria.
For Static Analysis:
(i) Peak Incident Overpressure ( ) (as recommended in RRA / QRA report) subjected to
minimum as specified in section 5.1.
(ii) In case RRA / QRA report is not available, shall be considered as specified in section 5.1.

For Dynamic Analysis:

(i) and its duration ( ) (as recommended in RRA / QRA report)
report).
(ii) Unless specified otherwise where the dynamic analysis is being carried out blast resistant
design of structural members shall govern based on the maximum of the dynamic analysis
and static analysis (based on peak incident overpressure as specified in secti
section 5.1) results.
(iii) Further for double storey construction, RRA / QRA study shall be conducted in advance and
blast resistant design of structural members shall govern based on the maximum of the
dynamic analysis and static analysis (based on peak incident overpressure as specified in
section 5.1)

8.3 ANALYSIS METHODOLOGIES

8.3.1 STATIC ANALYSIS PROCEDURE

A complete 3-D model of the structure should be developed including all frame elements, RCC walls
and roof. Static incident (side-on) overpressure shall be applied as pressure loading on side walls and
roof, based on loading configuration (refer Fig. 1). Further, blast load on front wall shall be increased
by a reflective pressure coefficient (R) as follows:
, R
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Blast pressure on walls shall be applied above Finished Ground Level (FGL). All walls shall be treated
as front wall under different load cases and opposite wall shall be considered as rear wall and
conservatively, no load shall be considered on that side.

8.3.2 DYNAMIC ANALYSIS PROCEDURES

For dynamic analysis purpose also, a complete 3-D model of the entire structure similar to static
analysis, shall be developed. Dynamic loads are applied simultaneously to all walls and roof according
to their arrival time and duration. Evaluation of all these time dependent blast pressure values can be
-
plastic analysis in time domain can be carried out for obtaining
taining the responses of the entire structure.

8.4 DESIGN CONSIDERATIONS

(i) Design of structural members for blast loading shall be done for load factor of unity (under
limit state load combinations).
(ii) No Live Load shall be considered on roof under blast load condition.
(iii) Grade of Concrete shall be minimum M25 (preferably M30).
(iv) The minimum thickness for roof slab and external wall shall as follows:

100 mm + 2 times the cover subjected to minimum overall thickness of 150 mm for
roof slab
125 mm + 2 times the cover subjected to minimum overall thickness of 200 mm for
wall
If required from shear design criteria wall/ roof thickness may be increased instead of
providing shear reinforcement
reinforcement.
(v) RCC Blast wall shall be taken up to 1.5 m below FGL/ HPP, maintaining the wall thickness
and reinforcement same as in superstructure.
(vi) After attaining maximum response, the structure may have an elastic rebound, equal and
opposite to maximum deflection so the members shall be designed for reversal of stresses.
For design purpose, if the reversible stresses are acting opposite to the gravi
gravity loads cases
[(dead load) or (dead load + live load)], the response from later shall be subtracted from that
obtained for blast load case, only to calculate the maximum values of reversible forces. This
is only for static analysis. For dynamic analysis, the same will be automatically included in the
analysis results. Thus, roof slab and walls of Type
Type-B structures shall be suitably reinforced on
both faces (exterior and interior faces for wall and top and bottom reinforcement for beams
and slabs.
(vii) Maximum spacing of bars in walls as well as roof slab shall not exceed 150 mm centre to
centre. Minimum bar diameter shall be 12 mm.
(viii) Ductility for earthquake resistant structure as per IS 13920: 1993 shall be followed. Minimum
50% of top reinforcement shall be provided as bottom reinforcement at support locations.
(ix) Minimum percentage of reinforcement as given in IS 456 shall be followed for design of all
structural elements except for wall & slab. For wall & slab the same shall be 250/fy (yield
strength of rebar).
(x) Openings shall be covered by RCC Hood type structures duly designed for blast loads. (Refer
Fig. 2).
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(xi) Horizontal and Vertical expansion gaps shall be covered with proper overlapping of
projections from both the parts of the building/ baffle wall (Refer Fig. 3a & 3b).
(xii) Slender projections like parapets etc. shall be avoided, if required, the same need not to be
designed for blast loading.
(xiii) Control room building shall be designed taking into consideration the respective design of
wind/ seismic requirements. Wind and/ or seismic load shall not be considered to act
simultaneous with blast loads.
(xiv) Safe bearing capacity of soil/ pile shall be increased by 50% under blast conditions. A higher
value of such increase is allowed as per Geotechnical recommendation but limited to 100%.
(xv) Factor of safety against sliding and overturning may be reduced to 1.0 & 1.2 respectively
compared to that of 1.5 (being considered in general for loads involving wind/ earthquake).
(xvi) Advantage of soil friction, passive earth pressure or anything similar can only be considered
with proper Geotechnical recommendations. In such cases the factor of safety against sliding
and overturning shall be considered as 1.5.
(xvii)Fig.
Fig. 2, Fig. 3a & 3b are given for reference. Other structural detailing for protection of various
openings, expansion joints etc. can also be adopted based on acceptable design practice.
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Ps0 Ps0

Side Side

Pr Pr
Front Back Back Front
Blast
Blast
Side Side

Ps0 Ps0

Blast
Pr
Front Back

Ps0 Side Side Ps0 Ps0 Side Side Ps0

Back Front
Pr

Ps0 Blast

Roof

Pr Front
Wall Back
Wall

HPP/FGL

Fig. 1: Blast loading configurations - reflected overpressure (Pr = R x Pso) on front wall and incident
overpressure (Pso) on side walls and roof.
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Fig. 2: Typical RCC hood detail for wall opening

Fig. 3a: Typical detail of horizontal expansion gap covering

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Fig. 3b: Typical detail of vertical expansion gap covering

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9.0 RETROFITTING OF EXISTING CONTROL ROOM:

Retrofitting in general involves strengthening of existing structure to meet new requirements like
extension for additional services or reviving a damaged or an inadequate structure to make it safe for
use again, complying relevant Codal provisions. This section defines the requirements of retrofitting of
the existing control room building. Non blast type of control room building (type A), if requires to be
converted as blast resistant type (type B) due to new services or location criteria as defined in this
standard or itself a type B control room which requires requalification due to damages suffered from
any natural calamity or from hydrocarbon blast itself, retrofitting of such existing structures to be carried
out as outlined below:
(i) Various NDT tests are required for health assessment
ssessment of the existing control room building such
as Ultrasonic Pulse Velocity (UPV) test, Rebound Hammer test, Core Cutting test, Cut and Pull
Out (CAPO) test, Profoscoping Scan, Half Cell Potentiometer (HCP) test, Carbonation test & other
Chemical tests including pH tests & and any other test as felt necessary. All these tests shall be
carried out through a BIS approved laboratory.
(ii) Based on the health assessment study as performed above, actual properties of the structure
shall be evaluated and also actual loadings (gravity loads as actually present, as these may differ
from the design condition subjected to the minimum code specifie
specified value) shall be considered for
further analysis of the existing structure with appropriate software.
(iii) All critical structural elements like columns, beams, foundation system etc. shall be identified and
strengthened with additional reinforcement or structural system shall be enhanced with additional
frame work etc. based on the analysis results.
(iv) Major
ajor retrofitting activity of conversion of type A to type B involves replacement of all external
masonry work to RCC work. In cases where replacement is not possible due to continuing
operation or short shut-downdown period, existing masonry works can be retained and protected by
new RCC work from exterior side. However, post construction is preferred to remove all such
external brick wall to avoid additional loads to the foundation system.
(v) Retrofitted structure with all modifications shall be considered for final analysis to show their
adequacy for meeting all new design requirements.
(vi) Study of the existing Electrical, Instrumentation, HVAC, Infrastructure facilities shall also be
conducted. All necessary relocation/ modification shall be performed making the system
functional.
(vii) Detailed engineering and preparation of the required drawings shall be performed.

(viii) Pre
Preparation
paration of technical specifications and necessary procurement action for procurement of
materials (indigenous as well as imported) shall be done.
(ix) Strength and stability certification of the retrofitted blast resistant building shall be obtained from
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10.0 ABBREVIATION

AC Air-conditioning system
AC/ DC Alternating current/ Direct Current
AHU Air Handling Unit
ANSI American National Standards Institute
BIS Bureau of Indian Standards
BLEVE Boiling Liquid Expanding Vapour Explosion
CAPO Cut and Pull Out test
CCTV Closed-circuit television
CO2 Carbon dioxide
CPP Captive power plant
CR Control room
dB Decibel
DCP Dry Chemical Powder
DGMS Directorate General of Mines Safety
EPA Environment Protection Agency
ERDMP Emergency Response and Disaster Management Plan
ERP Emergency Response Plan
FGL Finished ground level
FRLS Fire retardant low smoke
GCP Gas compressor plant
GCS Gas collection station
GGS Group gathering station
HCP Half Cell Potentiometer
HPP High Point of Pavement
HSE Health, Safety & Environment
HVAC Heating ventilation & Air-conditioning
IS Indian Standard
ISA International Society for Automation
LNG Liquefied natural gas
LPG Liquefied Petroleum Gas
MOC Management of change
NABL National Accreditation Board for Testing and Calibration Laboratories
NDT Non-destructive testing
NFPA National Fire Protection Association
OCS Oil collection station
ODP Ozone Depletion Potential
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OEM Original Equipment Manufacturer

P&ID Piping and Instrumentation Diagrams
PESO Petroleum and Explosives Safety Organization
POL Petroleum, Oil & Lubricants
PPE Personal Protective Equipment
QPS Quick production setup
QRA Quantitative Risk Assessment
RCC Reinforced Cement Concrete
RRA Rapid Risk Assessment
SMPV Static and Mobile Pressure Vessel
SOP Standard Operating Procedures
SRR Satellite rack room
UL Underwriters Laboratories
UPS Uninterruptible power supply
UPV Ultrasonic Pulse Velocity
VHF Very high frequency
WHI Well Head installation
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11.0 REFERENCES

(1) The Petroleum Rules 2002.

NFPA-2001 (Standard on Clean Agent Fire Extinguishing Systems ) edition 2018
(3) NFPA-72 (National Fire Alarm and Signaling Code)
(4) API-
(5) Loss Prevention in Process Industries by Frank P.Lees
(6) ISA-RP 60.1 on Control Centre Facilities.
(7) ISA-S 71.04
(8) National Building Code.
(9) IS: 4991-1968 (Reaffirmed 2003) Criteria for Blast Resistant Design of Structures for Explosions
above Ground
(10) IS: 2190(Selection,
(Selection, Installation and Maintenance of First Aid Fire extinguishers - Code of Practice)
(11) IS: 456 (Plain and Reinforced Concrete - Code of Practice)
(12) IS: 13920 (Ductile Detailing of Reinforced Concrete Structures Subjected To Seismic Forces
Code Of Practice)
(13)
Resistant Design of Petrochemical Committee of the Energy Division of the ASCE
(14) PNGRB (Petroleum and Natural Gas Regulatory Board)
(15) PIP STC01018
01018 Blast Resistant Building Design Criteria
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ANNEXURE I
SELECTION OF THE TYPE OF CONSTRUCTION FOR CONTROL ROOMS

CONTROL ROOM LOCATION

PLANT / UNIT
Up to 30 M Up to 60 M 60 - 120 M

Crude Distillation/ Visbreaker/ Delayed Coker/ Gas - Type B Type-A

Concentration unit/ Hydrodesulphurization/ Reformer/
Hydrogen plant
Vacuum Distillation / Sulphur Recovery / Solvent Extraction- - Type-
Type
Type-A*
-A* Type-A
MEK, Furfural, Phenol, Sulfolane, Normal Methyl
Pyrrolidone / Bitumen / Coke Calcination
FCC/ Hydrocracker/ Propane Deasphalting/ LPG - Type-B Type-B
Sweetening
Pressurized storage (Above Ground ) for C2 / LPG/ LNG/ Type-B
Type-
Type -B Type-B Type-A
Cryogenic Ethane
Pressurized storage (Mounded) for C2 / LPG/ LNG/ Type-B
Type Type-A* Type-A
Cryogenic Ethane
C2/C3/ LPG Recovery - Type-B Type-B
Crude stabilization - Type-A* Type-A
Offsite Storage Facility: POL (Class - A product) Type-B Type-A* Type-A
Offsite Storage Facility: POL (Class- B product) Type-B Type-A** Type-A

Offsite Storage Facility: POL (Class-

(Class C product) Type- A* Type- A* Type-A
Marketing POL Terminals (From above ground storage
s - Type- A* Type-A
tank)
Marketing LPG Terminals
erminals ((From
From p
pressurized above ground Type-B Type-B Type-A
storage vessel)

Marketing LPG Terminals (From pressurized mounded Type-B Type- A* Type-A

storage vessel)

Power Plants (Liquid/ Gas hydrocarbon as fuel) - Type-A* Type-A

Pipelines Terminals (Gas) with compressor station - Type-A* Type-A

LPG Pipelines Terminals (From pressurized above ground Type-B Type-B Type-A
storage vessel)
LPG Pipelines Terminals (From pressurized mounded Type-B Type- A* Type-A
storage vessel)
Pipelines Terminal for Crude oil / Multiproduct with pumping - Type-A* Type-A
facility (From above ground storage tank)
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1. For Type-A*: QRA/ RRA recommendations to be implemented for all cases for construction of
buildings in such a way that it can withstand the blast pressure requirement as mentioned in
QRA/ RRA study. The Study shall be conducted based on OISD-GDN-206, OISD-STD-118.
2. In case other than those facilities listed in Annexure-1, the type of construction shall be decided
after appropriate QRA/ RRA study.

3. Type-A** denotes up to 45 m
Notes :
1. Distance bands indicated above are to be used for deciding the type of construction for the Control
Room. This standard excludes minimum inter distances between the block facilities for which OISD-
OISD
STD 118 shall be referred.
2. Beyond 120 m distance, control
ontrol room need not be of blast resistant type unless specifically
recommended in QRA/RRA study.
3. Plants not listed in the above table shall be studied on case-to-case
case basis.
4. QRA/ RRA recommendations to be implemented for all cases where distance is less than 60 meters
subjected to minimum requirement as specified in section 5.1 for Type
Type-B control room.
5. The buildings at Sectionalizing valve stations and separate intermediate pigging stations for
pipelines are unmanned and hence not considered as control room. In these locations Type
Type-A or
even Porta cabin may be provided. This is applicable for crude oil, POL, LPG and Gas compressor
stations.
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ANNEXURE II

LIMITING ROOM/ SPACE FOR A CONTROL ROOM

S. Requirement Details
No.

1. Basic functional rooms/spaces Console room, rack room, instrumentation calibration

room and computer room, Engineering Room, PLC/
Advance control / Optimization room.
2. Services/utility rooms/spaces UPS room, battery room, HVAC room and clean agent
cylinder room
3. Accommodation and office Seating space for control room staff, viz. operators, shift
requirement for control room staff engineers, shift-in-charge,
charge, Engineers In-charge
In directly
involved in Operation & maintenance and record room,
4. Amenities (for control room staff only) Toilet, discussion room, room for essential maintenance
personnel, locker and change room, dining room, space
for fire extinguishing and personal protective equipment
Note: -
1. Space provided in the control room shall essentially be for authorized working personnel within
the premises.
2. No space shall be provided for repair and/or workshop (even for control room maintenance) within
the control room premises.
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ANNEXURE III

ESSENTIAL LAYOUT REQUIREMENT OF CONTROL ROOM

Applicability
Details exclusive to
All rooms/spaces shall be enclosed within blast resistant peripheral walls and Type-B
B structures
roof. The structure should preferable rectangular.

The entries/ exits to the control room shall have least resistance escape route Type-B
Type-
Type -B structures
with least exposure to hazardous area. Baffle walls with roof shall be provided
to prevent direct entry of blast wave in the control room. Baffles shall be at 45 0
or 900 to the access way.

Manned room/ space shall have at least two separate and distinct means of All type of structures
emergency exit. Requirements of emergency exits shall be as per National
Building Code of India and other applicable (Factories) acts.

Air-conditioned
conditioned areas shall be provided with air lock lobbies. All type of structures

Openings in walls for AC plant/ AHU, toilet etc.

etc. shall be located on wall facing Type-B structures
non-hazardous
hazardous area. Openings for exhaust fans shall be protected with blast
resistant concrete hood.
Openings for pipes/cables shall be sealed to prevent entry of vapor/gas

Fire protected areas shall be isolated from non

non-protected areas. Suitable fire All type of structures
rated doors shall be used

Area of openings shall not exceed 7% of wall area Type-B structures

Area of openings shall not exceed 15% of wall area Type-A structures

Window area shall not exceed 0.25m2, with width of windows not exceeding Type-B structures
0.30m. Toughened glass or shatter proof glass of 7psi rating shall be used.
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Annexure- IV
MAJOR CHANGES IN REVISED EDITION

OISD-STD- SAFETY OF CONTROL ROOM FOR HYDROCARBON INDUSTRY

revision in the month of August-2021 through the FC constituted by OISD. Most of the FC meetings
were held in virtual mode only. These are the major changes being proposed by the committee as
below:
1. Scope Excludes:
DM Plant Operations
Data Center for facilities without any automatic control or shutdown safety system are
not considered as a control room.
2. Essential amenities:
Locker room, discussion room pertaining to only O&M, Record room, Dining room, toilet etc.
3. Provision of double storied blast resistance building for control room/ SRR is included with
stipulations.
4. Provision of essential equipment on the roof
oof is covered with stipulations.
5. Provision of Sealed Maintenance-Free
Free (SMF) batteries or Valve
Valve-Regulated Lead-Acid batterie
are provided which are not emitting hydrogen and requirement of heat detector is covered.
6. Clean Agent system design, installation and inspection methodologies is explicitly covered.
7. Section on Structural Safety has been modified by incorporating design load, Analysis
methodologies etc. is explicitly covered.
100 mm + 2 times the cover subjected to minimum overall thickness of 150 mm for
roof slab.
125 mm + 2 times the cover subjected to minimum overall thickness of 200 mm for
wall.
Ductility for earthquake resistant structure as per IS 13920: 1993.
Percentage of reinforcement as given in IS 456.
8. New Section added for ba
basic guidelines for Retrofitting of Existing Control Room
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Annexure -V

List of Previous functional committee(s)

(September 2004)

___________________________________________________________________

NAME ORGANISATION
___________________________________________________________________
LEADER
Shri R.Rajaraman Engineers India Limited, New Delhi

MEMBERS
Shri K.L.A. Khan Oil and Natural Gas Corporation Limited, Dehradun
Shri U.K. Pal Indian oil Corporation Limited, Pipelines, Noida
Shri A.B.Chattopadhyay Hindustan Petroleum Corporation Limited, Visakh
Shri A.K. Maiti Numaligarh Refinery Limited, Numaligarh
Shri S.K. Kulkarni Hindustan Petroleum Corporation Limited, Mumbai
Shri K.S. Balan Kochi Refineries limited, Kochi.
Shri Y.B. Sonar Oil and Natural Gas Corporation Limited, Hazira
Shri V. Narayanan Chennai Petroleum Corporation Limited, Chennai
Shri A. Chakravorty Indian oil Corporation Limited, Refineries, New Delhi
Shri R.B. Tupe Bharat Petroleum Corporation Limited, Mumbai
Shri D.K. Varshney Oil Industry Safety Directorate, New Delhi

MEMBER COORDINATOR
Shri P.Kulshreshtha Oil Industry Safety Directorate, New Delhi

Amended Edition September 2001

Incorporated modifications / changes / additions based on amendments approved in
19th safety council meeting held in September 2001.
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(September 1996)

NAME ORGANISATION
___________________________________________________________________

LEADER
Shri M. M. Kapoor Engineers India Limited, New Delhi

MEMBERS
Shri V. K. Raina Bharat Petroleum Corporation Limited, Mumbai
Shri S. K. Mukherjee Hindustan Petroleum Corporation Limited, Mumbai
Shri K. K. Arora Oil and Natural Gas Corporation Limited, Raigad
Shri S. Pandarinathan Madras Refineries Limited, Madras

MEMBER COORDINATOR
Shri S. N. Mathur Oil Industry Safety Directorate, New Delhi