-
OISD-STANDARD-118 Amended edition FOR RESTRICTED CIRCULATION
LAYOUTS
FOR
OIL AND GAS INSTALLATIONS
OISD-STANDARD-118 First Revision, July 1995
Amended edition. August 2000
Oil Industry Safety Directorate Government of India
Ministry of Petroleum & Natural Gas
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OISD-STANDARD-118 First Revision, July 1995 Amended edition.
August 2000 FOR RESTRICTED CIRCULATION
LAYOUTS
FOR
OIL AND GAS INSTALLATIONS
Prepared By :
COMMITTEE ON LAYOUTS
OIL INDUSTRY SAFETY DIRECTORATE 2ND FLOOR, KAILASH
26, KASTURBA GANDHI MARG NEW DELHI-110 001
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"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
NOTE OISD publications are prepared for use in the oil and gas
industry under Ministry of Petroleum and Natural Gas. These are the
property of Ministry of Petroleum & Natural Gas and shall not
be reproduced or copied or loaned or exhibited to others without
written consent from OISD. Though every effort has been made to
assure the accuracy and reliability of the data contained in these
documents, OISD hereby expressly disclaims any liability or
responsibility for loss or damage resulting from their use. These
documents are intended only to supplement and not to replace the
prevailing statutory requirements.
Note1 in superscript indicates the modification/changes/
addition based on the amendments approved in the 17th Safety
Council meeting held in July, 1999.
Note 2 in superscript indicates the
modification/changes/addition based on the amendments approved in
the 18th Safety Council meeting held in August, 2000.
-
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
iii
FOREWORD The Oil Industry in India is over 100 years old. As
such various practices have been in vogue because of
collaboration/association with different foreign companies and
governments. Standardisation in design philosophies and operating
and maintenance practices at a national level was hardly in
existence. This coupled with feed back from some serious accidents
that occurred in the recent past in India and abroad, emphasised
the need for the industry to review the existing state-of-the-art
in designing, operating and maintaining oil and gas installations.
With this in view, the Ministry of Petroleum and Natural Gas in
1986 constituted a Safety Council assisted by the Oil Industry
Safety Directorate (OISD) staffed from within the industry for
formulating and implementing a series of self regulatory measures
aimed at removing obsolescence, standardising and upgrading the
existing standards to ensure safer operations. Accordingly, OISD
constituted a number of functional committees comprising of experts
nominated from the industry to draw up standards and guidelines on
various subjects. The experience and knowledge gathered over the
years and the various national and international codes and
practices are taken into consideration. The first edition of the
document on "Layouts for Oil and Gas Installations" was prepared by
the Functional Committee and published in November 1988. This
document of July 1995 is the first revision prepared by the
Functional Committee. This document will be reviewed periodically
for improvements based on the experience and better understanding.
Suggestions from industry members may be addressed to:
The Coordinator Committee on Layouts
Oil Industry Safety Directorate 2nd Floor, Kailash
26, Kasturba Gandhi Marg New Delhi-110 001
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"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
COMMITTEE ON LAYOUTS (First Edition - November 1988)
NAME ORGANISATION Leader
Shri R.P.Bhatla Engineers India Ltd., New Delhi Members
Shri K.K. Arora Oil & Natural Gas Corpn. Ltd., Bombay
Shri S.K. Mukherjee Hindustan Petroleum Corpn. Ltd. (R),
Bombay
Shri V.K. Raina Bharat Petroleum Corpn. Ltd. (M), Bombay
Shri K. Ravi Kumar Madras Refineries Ltd., Madras Member
Coordinator
Shri B.K. Trehan Oil Industry Safety Directorate, New Delhi
COMMITTEE ON LAYOUTS (First Revision - July 1995)
Leader
Shri R.P. Bhatla/ Engineers India Ltd., New Delhi
Shri M.M. Kapoor
(since February, 1995) Members
Shri S.K. Mukherjee Hindustan Petroleum Corpn. Ltd. (R),
Bombay
Shri K.K. Arora Oil & Natural Gas Corpn. Ltd., Bombay
Shri V.K.Raina Bharat Petroleum Corpn. Ltd. (M), Bombay
Shri S. Pandarinathan Madras Refineries Ltd., Madras Member
Coordinator
Shri B. Sadhukhan/ Oil Industry Safety Directorate, New
Delhi
Shri S.N. Mathur
(since April, 1995) (In addition to the above, several other
experts from the industry contributed in the preparation, review
and finalisation of this document.)
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"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
v
LAYOUTS FOR OIL AND GAS INSTALLATIONS
INDEX
SECTION CONTENTS
1.0 Introduction 2.0 Scope 3.0 Definitions 4.0 Plant Layout
Philosophy 5.0 Layout of Blocks/Facilities 5.1 General
Considerations 5.2 Inter-distances 6.0 Layout of Process Units 6.1
General Considerations 6.1.1 Process Equipment 6.1.2 Control Room
and Sub-Station 6.2 Equipment Spacing within Process Units 7.0
Layout of Storage Tanks 7.1 General Considerations 7.2
Inter-distances between Tanks / Offsite Facilities 8.0 Layout of
LPG Facilities 8.1 General Considerations 8.1.1 LPG Storage 8.1.2
LPG Bottling 8.1.3 LPG Bulk Handling 8.2 Inter-distances for LPG
Facilities 9.0 Layout of Utility Stations 9.1 General
Considerations 9.2 Inter-distances 10.0 References TABLES
1. Inter-distances between Blocks/Facilities 2. Equipment
Spacing within Process Units 3. Inter-distances between Storage
Tanks/Offsite Facilities (for Small Installations) 4.
Inter-distances between Storage Tanks/Offsite Facilites 5.
Inter-distances between Storage Tanks 6. Distances from Boundary
Fencing 7. Inter-distances for LPG Facilities 8. Inter-distances
between LPG Storage Vessels and Boundary/Property Line/ Group of
Buildings not associated with LPG plant. ANNEXURE 1 : TYPICAL
LAYOUT OF LPG STORAGE VESSELS
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"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
LAYOUTS FOR OIL AND GAS INSTALLATIONS
1.0 INTRODUCTION Hydrocarbon processing and handling plants are
inherently hazardous. Today's trend of large and complex plants
presents substantial risk potential. At times plants are modified
to operate at higher capac ities or efficiencies necessitating
larger storage requirements than contemplated earlier. For these
reasons, initial site analysis for the proposed new construction or
addition should be done carefully while considering the space
allocation to the various facilities.
The hydrocarbon industry over the years learnt lessons from
fires and explosions throughout the world and has been up-dating
plant safety norms including inter-distances between facilities and
their relative locations. The minimum distances recommended many
years ago need review in the context of today's environment in the
industry.
It is not intended that requirement of this standard should be
applied rigidly to existing premises where for a variety of
reasons, it may not be practicable to comply with. This standard
will however create awareness and help in selective implementation
of the recommen-dations at existing installations. 2.0 SCOPE
This document lays down minimum requirements of layouts within
the plant boundary for petroleum refineries, Oil/Gas production and
processing plants, LPG filling plants and other petroleum storage
installations. The requirement of green belt/buffer zone beyond the
plant boundary is outside the scope of this standard. Such
provision may be considered based on local environmental/ security
requirements. 3.0 DEFINITIONS
(i) PETROLEUM REFINERY
Petroleum Refinery is a plant where crude oil is received and
processed into intermediates and finished products.
(ii) OIL/GAS PRODUCTION PLANT
Oil/Gas production plant is a plant where oil and/or gas is
collected, stabilised and despatched for further processing.
Drilling activities and facilities upstream of the christmas tree
of a well are not covered under this definition.
(iii) GAS PROCESSING PLANT
Gas processing plant is a facility where natural gas is received
and processed to make gas, LPG, condensate etc.
(iv) LPG FILLING PLANT
LPG filling plant is a plant where liquefied petroleum gas (LPG)
is received/despatched by rail, road and pipeline and filled in
cylinders.
(v) OTHER PETROLEUM STORAGE INSTALLA-TIONS
Other petroleum storage installations include:
- Crude oil gathering stations
- Coastal storage installations for crude oil and petroleum
products
- Marketing depots and terminals
- Aviation storage and fuelling stations
- Pipeline installations/terminals. (vi) FLASH POINT "Flash
point" of any petroleum liquid is the
minimum temperature at which the liquid yields vapour in
sufficient concentration to form an ignit-able mixture with air and
gives a momentary flash on application of a small pilot flame under
speci-fied conditions of test as per IS:1448 (Part-I).
(vii) GENERAL CLASSIFICATION OF PETROLEUM
PRODUCTS Petroleum products are classified according to
their closed cup FLASH POINTS as follows:
Class "A" Petroleum: Liquids which have flash point below 23
oC.
Class "B" Petroleum: Liquids which have flash point of 23 oC
and above but below 65 oC.
Class "C" Petroleum: Liquids which have flash point of 65 oC
and above but below 93 oC.
Excluded Petroleum: Liquids which have flash point of 93 oC
and above. Liquefied gases including LPG, do not fall under
this classification but form separate category.
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OISD-STD-118 Revision -II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
3
In the following cases, above classification do not
apply and special precautions should be taken as required:
(a) Where ambient temperatures or the handling temperatures are
higher than the flash point of the product.
(b) Where product handled is artificially heated to a
temperature above its flash point.
(viii) TANK HEIGHT
Tank height is the:
- Height from tank bottom to top kerb angle for cone roof
tanks
- Height from tank bottom to top of tank shell for floating roof
tanks
(ix) STABLING LINE
It is an additional railway line/spur reserved for additional
rake/stabling.
4.0 PLANT LAYOUT PHILOSOPHY A petroleum installation may be
broadly considered as a group of one or more of the following
units/facilities:
- Crude oil storage
- Intermediate and finished product storage
- LPG storage and handling facilities
- Process units and control room
- Product loading/unloading facilities (Rail, Road and
Pipelines)
- Utilities generation and distribution centers
- Blow down and flare system
- Waste water treatment facilities
- Administrative and service buildings (ware-house, workshop,
canteen, fire station, laboratory, first aid, parking lot etc.)
Following points shall be kept in mind while developing overall
plant layout of any installation.
(i) BASIC INFORMATION (a) Information on following items should
be
collected before proceeding with the development of overall plot
plan:
- Process units and their capacities
- Process flow diagram indicating flow sequence
- Utility requirements
- Storage tanks list
- LPG storage vessels and their sizes
- Product despatch and mode of transport (rail, road and
pipeline)
- Warehouses, open storage areas
- Number of flares
- Operating and maintenance philosophy for grouping of
utilities
- Plant and non-plant buildings
- Environmental considerations
- Scrap yards and dumping ground
- Fire station and fire training ground
- Chemical/Toxic Chemical storage
- Storage areas for solid products such as petroleum coke,
petroleum wax, coal, bitumen and asphalt
(b) Data on following infrastructural facilities
should be collected before detailed layout activity is taken up
and due consideration should be given for the same while deciding
plant layout:
- Site location map
- Prevailing wind direction
- Area topography contour map
- High flood level in the area
- Source of water supply and likely entry point
- Electric supply source and direction of entry point
- Crude oil entry point
- Storm water disposal point and effluent disposal point
- Railway entry point and marshalling yard location
- Approach roads to main plant areas
- Inward/outward product movement by rail/ road and
pipelines.
- Surrounding risks (ii) BLOCKS
(a) In any process installation, it is recommen-ded that plant
layout arrangement should follow the general route of raw material
to process unit (s) with tankages interposed as required followed
by despatch facilities.
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4 OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
(b) Block layout should be adopted as much as possible. The
entire area should be sub-divided into blocks. Maximum size of a
block should be established based on tank farm layouts.
(iii) ROADS
(a) All process units and dyked enclosures of storage tanks
shall be planned in separate blocks with roads all around for
access and safety. Primary traffic roads in the installation should
be clear of hazardous classified areas. Roads separating the blocks
shall provide fire breaks and have facilities for fire fighting
activities.
(b) Alternative access should be provided for each facility so
that it can be approached for fire
fighting/maintenance/construction in the event of blockage on one
route.
(c) Road widths and turning radii at road junctions shall be
designed to facilitate movement of the largest fire fighting
vehicle in the event of emergency.
(d) Rail spur shall be located close to the periphery of the
plant to minimise road crossings and blockage of roads during
shunting.
(e) Layout of the facilities shall be made to minimise truck
traffic ingress in the plant.
(f) Two road approaches from the highway should be provided, one
for employees and other for product movement. Both these approaches
should be available for receipt of assistance in emergency.
However, for smaller installations, this requirement may be relaxed
if not feasible.
(iv) LOCATION
(a) Process unit(s) should be located on high ground to avoid
flooding.
(b) Presence of ignition source shall always be contemplated
beyond the boundary wall of the installation.
(c) Orientation of flares,furnaces/heaters, dusty operations
(e.g. sulphur handling) and cooling towers should be decided based
on prevailing wind direction.
(V) ERECTION AND MAINTENANCE
(a) Erection methods shall be anticipated for all types of
equipments. Towers, reactors and
fired equipments should be located away from congested areas to
facilitate erection at any stage.
(b) Maintenance methods for each type of equipment shall be
identified in advance since these affect the requirements for
layout. Equipment requiring frequent atten-tion shall have easy
accessibility. For equip-ments having removable parts, wherever
possible, arrangements shall be made to facilitate their removal
without dismantling long lengths of piping. Free access shall be
provided for hoisting the equipment.
(vi) FUTURE EXPANSION
Future expansion shall be assessed and space provision for known
and unforeseen needs shall be made. Orderly future expansion shall
be affected by providing space adjacent to similar type of
facilities for expansion. Extension of pipe sleepers and pipe way,
road crossings for yard piping shall be given due consideration.
Care shall be taken to facilitate future expansion without any
interferene to plant on-stream.
5.0. LAYOUT OF BLOCKS/FACILITIES
An installation may consist of one or more of the following
basic blocks/facilities:
- Storage tanks/offsites - LPG storage and filling facilities -
Process units - Utilities and effluent disposal facilities 5.1
GENERAL CONSIDERATIONS
While locating the above blocks/facilities and further sub
blocks/facilities within them, following items should be considered
:
(i) Layout planning should be in sequential order of process
flow.
(ii) Orientation should be to suit wind direction to avoid
travel of hydrocarbon vapour over sources of ignition.
(iii) Process units should be centrally located with straight
approach from main gate. Orientation of process units should follow
process flow in sequential order so that piping runs are also
minimum.
Location of tall columns and furnaces should be
close to road side for ease of construction and maintenance.
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OISD-STD-118 Revision -II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
5
(iv) Storage tanks should be grouped according to product
classification. In undulating areas, storage tanks should be
located at lower elevations.
(v) Utility blocks should be located adjacent to unit
blocks. (vi) Main power receiving station should be close to
the fence line with minimum overhead power transmission lines
passing through the installa-tion.
Overhead power transmission lines shall not pass
over process units, storage tanks, offsite and utility areas.
Wherever these lines are passing through plant premises adequate
safety distances shall be kept.
(vii) H T sub-station should be located close to major
load centres. One or more sub-stations could be provided to
limit distances.
(viii) L T sub-station should generally be located at
load centres in such a way that the distance between
distribution transformer and farthest motor is minimum.
(ix) Gas/Oil based power plants should be located
close to process units/utility blocks and closer to Main
Receiving Station, as far as possible. Coal based power plants
should be located away from criticalfacilities like air separation
plants, electri-cal installations etc. to avoid problems due to
coal dust and ash.
(x) Flare should be located upwind of process units.
Height of flare and its distance from operating facilities shall
be decided based on heat radiation considerations and other
considerations like ground level concentration, cold venting
etc.
Area around flare should be paved to avoid
growth of grass/vegetation which can otherwise provide
combustible material for fires. (Ref. section 8.0 of OISD-STD-106
on "Process Design and Operating Philosophies on Relief and
Disposal systems").
(xi) Truck loading facilities should be located close to
product movement gate. Rail loading facilities should suit rail
siding layout and preferably be located along periphery of the
installation.
(xii) Effluent Treatment Plants should be located
minimum one block away from unit area, down wind of process
units and important areas to avoid odour problems. They should be
closer to
disposal point and at lower grade to facilitate gravity flow of
effluent.
(xiii) Sulphur recovery unit and sulphur loading area
should be located close to product movement gate and away from
hazardous and populated areas. A minimum distance of 50m is
recommen-ded between sulphur storage/handling and any building or
boundary wall.
(xiv) Petroleum coke/coal storage and handling
facilities should be located as far as possible away from
process units, air separation plants, populated and hazardous
areas.
(xv) Sufficient open areas should be left where
construction activities can be undertaken. Requirements for
erecting tall structures should be studied before finalising the
layout.
(xvi) Fire station should be located close to main entry
gate with straight approach to process units/other critical
areas. Fire station and fire water pump house shall be located at a
safe place away from hazardous areas. Fire station includes fire
tenders, foam equipments and fire fighting accessories.
(xvii) Fire water storage and pumps shall be located at
a minimum distance of 60 m from hydrocarbon storage and process
units. However for petroleum depots and terminals, it shall be as
per clause 4.3.5(V) of OISD-STD-117.
5.2 INTERDISTANCES Interdistances between various
blocks/facilities described above shall be as per Table-1.
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6 OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
TABLE - 1 (NOTE1)
MINIMUM INTERDISTANCES BETWEEN BLOCKS/FACILITIES
S.No. From \ To 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1. Process Units 36 *** 30 45 30 60 90 150 45 60 45 30 60 60 30
90
2. Process Control *** - ** 45 30 60 90 150 45 30 30 - 30 15 30
30 Room
3. Storage Tank 30 ** T3 & T3 & T3 & 30 90 150 30 60
90 30 T6 60 30 50 Class A T5 T5 T5
4. Storage Tank 45 45 T3 & T3 & T3 & 30 90 150 30 60
90 30 T6 30 30 50 Class B T5 T5 T5
5. Storage Tank 30 30 T3 & T3 & T3 & 30 90 150 30 60
90 30 T6 30 30 50 Class C T5 T5 T5
6. Storage Vessels 60 60 30 30 30 T7 90 150 30 90 90 30 T8 45 30
60 (Pressure) LPG/Other
7. Flares-elevated 90 90 90 90 90 90 90 150 90 90 90 90 90 90 90
90
8. Flares-ground 150 150 150 150 150 150 150 150 150 150 150 150
150 150 150 150
9. Bulk loading racks 45 45 30 30 30 30 90 150 T7 90/60 30 T7
T6/T760 30 50 (rail/road) LPG/POL
10. Fire stations/ 60 30 60 60 60 90 90 150 90/60 - 30 30 12 12
30 90 First aid centre
Contd...
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OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
7
TABLE - 1 (Contd..)
S.No. From \ To 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
11. Boiler House/ 45 30 90 90 90 90 90 150 30 30 - 15 50 30 30
90 heaters 12. Rail spur 30 - 30 30 30 30 90 150 T7 30 15 - 30 6 15
50 13. Boundary fence 60 30 T6 T6 T6 T8 90 150 T6/T7 12 50 30 - 6
30 50 around installation 14. Service buildings 60 15 60 30 30 45
90 150 60 12 30 6 6 - 30 50 15. Cooling towers, 30 30 30 30 30 30
90 150 30 30 30 15 30 30 - 15 water storage, nitrogen plant 16. API
Separators/ 90 30 50 50 50 60 90 150 50 90 90 50 50 50 15 - oil
sludge pit
** Distance will be 30 meters in case Control Room is blast
proof and 60 meters in case it is not blast proof. *** Refer
OISD-STD-163 on Process Control Room Safety Notes : 1. All
distances are in metres.
2. All distances shall be measured between the nearest points on
the perimeter of each facility except in case of tank vehicle
loading/unloading area where the distance shall be measured from
the centre of each bay.
3. "T" indicates the table to be referred.
4. Where distances have not been specified, it shall be decided
based on construction,operation & maintenance requirements.
5. API/CPI, open oil separators/oil collection sumps shall be
categorised under the same risk and shall be located at 90m
distance from heaters/boilers. However, if these are covered from
top and provided with adequate venting to safe location, the
minimum safe distance can be reduced from 90m to 30m.
6. Distance between bulk loading racks and fire station shall be
: (i) For LPG Gantry - 90 m &
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8 OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
ii) For POL Gantry - 60 m.
7. Definitions :
Process Unit - a unit having integrated sequence of operation ,
physical and chemical, and may involve preparation, separation,
purification, or change in state, energy content or composition.
Service building a building housing facilities for
inspection/maintenance/other supporting services which are directly
required for operation of the plant. Fire station a building
housing facilities of parking fire tenders and keeping other ready
to use fire fighting equipment for meeting plant emergencies, fire
control room with required communication facilities/mimic
panel.
Fire pump house a building housing main fire water pumps, jockey
pumps, communication and alarm system, instrumentation and the
required operating & supporting personnel.
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OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
9
6.0 LAYOUT OF PROCESS UNITS 6.1 GENERAL CONSIDERATIONS 6.1.1
PROCESS EQUIPMENT
(i) Process flow sequence and operating procedures shall be
thoroughly understood so that equipment arrangement in the plot
plan is functional. Equipment shall be arranged in logistic process
sequence for short piping runs and operational ease.
(ii) It is recommended that the unit pipe rack be kept in the
centre, thereby splitting the unit into two or more areas of
equipments.Pumps may be arranged in two rows close to and on either
side of the central pipe rack. Heat Exchangers and vessels should
be grouped together forming outer rows on both sides of the rack.
Fired heaters should be kept at open end of the unit upwind from
the remaining plant equipments.
(iii) Spacing between battery limits of individual pieces of
equipment shall be adequate for undertaking maintenance jobs.
(iv) Spacing between two process units in a complex should be
decided based on shut down philosophy for maintenance of the units.
If the shut down of the units are expected at different occasions,
then inter distances may be increased.This will facilitate ease in
maintenance and minimise risk from/for operating units due to hot
jobs in the units under shut down.
(v) Heat exchangers should be located perpendicular to the pipe
rack on the outer row to facilitate pulling of tube bundles with
mobile crane or by other means.Shell and tube heat exchanger should
have a longitudinal clearance of at least one metre plus the length
of removable bundles.
(vi) Air fin coolers should be installed above the pipe rack.
Pumps handling hydro-carbons and materials above the temperature of
230 degree C should not be installed underneath the air fin
coolers.
(vii) Cold boxes should be located on grade or on separate
elevated structures. Adequate space should be provided around cold
boxes for ease of operation and maintenance.
(viii) Vessels having large liquid hold-up should be installed
at lower heights and preferably at grade. Adequate drainage should
be provided around such vessels. Where process requirement dictates
their installa-tion above grade, these should be located in open
area.
(ix) Towers/columns should be located along the pipe rack
towards open areas for unobstructed erection as well as maintenance
of internals at grade. Tall towers require frequent operating
attention at upper levels. Hence they may be located at one place
so that common connecting platform can be provided.
(x) Thermo-siphon reboilers should preferably be placed close to
their associated towers. Reboiler should be mounted on the tower so
that vertical expansion will be uniform, piping system design is
simplified and inlet/outlet piping is minimised. Clearance shall be
provided for movement between reboiler and tower.
(xi) Gas compressors should be located down wind from heaters so
that leaked gases will not drift towards the heater. Gas
compressors should have roofing and open from sides to avoid
accumulation of heavier vapours/gases on the floor of compressor
house. Compressor house should be located near the battery limits
to facilitate ease in maintenance and operation.
(xii) Heaters should be located up wind at one corner of the
unit. Space should be provided for removal and cleaning of heater
tubes besides approach for crane. Areas around the heaters shall be
graded for guiding spills away from process equipment. FD fans
shall be located away from process equipment from where they
arelikely to suck hydrocarbon vapours.
The local control panel for soot blower control and flue gas
analyser shall only be located on and near the process heater. The
rest of controls shall be taken to central control room.
(xiii) No other tankage except day tanks shall be
provided within battery limits of any process unit.
(xiv) Flare knock out drum of the closed blow
down system should be located at battery limit of the unit.
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10 OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
(xv) Blow down facilities/burried drum shall be
located at one corner of the plant farthest from furnace or any
fired equipment and on the lee-ward side of the unit.
Vent from Blow down facility shall be
minimum 6m clear off the air fin coolers. It shall be minimum 6m
above the highest platform if horizontal distance of 15m from
process equipment is not possible.
6.1.2 CONTROL ROOM AND SUB-STATION
(i) Control room should be located distinctly in the process
block or in the adjoining block. It should be at a safe distance
where protection to instruments and personnel is ensured and
non-hazardous electrical area classification is permitted. It
should have alternate means of exit with doors opening towards
outside. Doors should be made of fire proof material.
(ii) Control room should be designed to cater
for minimum occupancy.
(iii) Transformers should be located in open area on the rear
side of sub-station.Each transformer shall be isolated from the
other by a brick masonary wall. Approach road to sub-station and
transformer bays should be provided to facilitate crane movement
for erection and maintenance.
(iv) Electrical sub-station should be located
adjacent to the control room building and should meet the
requirements of electrical area classification.
6.2 EQUIPMENT SPACING WITHIN PROCESS
UNITS Interdistances betweenvarious equipments in
process units shall be as per Table-2.
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OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
11
TABLE-2
MINIMUM INTERDISTANCES BETWEEN EQUIPMENTS WITHIN PROCESS UNIT
This table could be used by the oil companies as a guideline for
their projects. These could be suitably modified as required to
suit space constraints and relevant engineering practices. NOTE
1
S.No. From \ To 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
20
1. Fired heaters/ - 15 15 15 22.5 15 15 20 15 15 15 16/30 15 -
18 15 6 30 15 15 any fired equip.
2. Reactors 15 2 2 6 8 7 15 7 7 4 3 16 - 15 5 15 3 15 15 3
3. Distillation 15 2 3 4 7.5 5 15 5 5 2 3 20 - 15 3 15 3 15 15 3
columns
4. Accumulators 15 6 4 2 8 5 15 4 4 2 3 20 - 15 3 15 3 15 15 3
(Hydrocarbon)
5. Gas compressors 22.5 8 7.5 8 3 7.5 15 7.5 7.5 7.5 7.5 16 - 15
4 15 3 20 15 7.5 (Hydrocarbon)
6. Hot oil transfer 15 7 5 5 7.5 1 7.5 1 1 1 2 2 16 - 15 3 15 -
15 15 - pumps
7. Fuel Oil Day tank 15 15 15 15 15 7.5 2 15 15 15 15 16 - 15 15
15 - 15 15 15
8. Pump for Class A & 20 7 5 4 7.5 1 15 1 1 2 2 16 - 15 3 15
- 15 15 - all products above auto-ignition temp.
9. Pumps - other 15 7 5 4 7.5 1 15 1 1 2 2 16 - 15 3 15 - 15 15
- Hydrocarbon
10. Heat Exchanger- 15 4 2 2 7.5 2 15 2 2 2 2 16 - 15 2 15 2 15
15 - Hydrocarbon
11. Air Fin Coolers- 15 3 3 3 7.5 2 15 2 2 2 - 16 - 15 2 15 - 15
15 2 Hydrocarbon
12. Control room 16/30 16 20 20 16 16 16 16 16 16 16 - 16 20 16
- 16 16 5 16
13. Snuffing/purging 15 - - - - - - - - - - 16 - - 2 - - 15 5 -
steam isolation valve
14. Fired heaters - 15 15 15 15 15 15 15 15 15 15 20 - - 10 15 -
15 15 5 control panel (local) Contd....
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12 OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
TABLE - 2 (Contd...)
S.No. From \ To 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
20 15. Pressure Vessel/ 18 5 3 3 4 3 15 3 3 2 2 16 2 10 2 15 3 15
15 2 Drums (Hydrocarbon)
16. Fire water 15 15 15 15 15 15 15 15 15 15 15 - - 15 15 - 15
15 - - hydrants/monitors
17. Pipe rack (main) 6 3 3 3 3 - - - - 2 - 16 - - 3 15 - 15 15
-
18. Blow down facility 30 15 15 15 20 15 15 15 15 15 15 16 15 15
15 15 15 - 15 15 (pumps, drums, stacks)
19. Water spray 15 15 15 15 15 15 15 15 15 15 15 5 5 15 15 - 15
15 - - Deluge valve
20. Structural main 15 3 3 3 7.5 - 15 - - - 2 16 - 5 2 - - 15 -
- (Technological platforms) Notes: 1. All distances are face to
face clear minimum distances in meters. 2. Distance between
equipments not covered herein & equipments handling
non-hydrocarbons shall be as per good engineering practices. 3.
From control room to heater, safe distance shall be 16m if the
control room is for one unit and shall be 30m, if it is for two
units. For gas
processing plants, it shall be 30m irrespective of whether the
control room is for one or more units. 4. Distances between the
reactor and furnace when directly connected process-wise, can be
relaxed to 5m. 5. Only distances indicated from fired heaters (1)
Fuel oil day tank (7), Control room (12), Fired heater local
control panel (14), Fire water
hydrant/monitor (16), Blow down facility (18) and water spray
deluge valve (19) are by safety considerations. Other distances
indicated are recommended from erection, operation and maintenance
safe guards.
6. The local control panel meant for soot blower control &
fuel gas analyser shall only be located on and near the process
firedheater. The rest of controls shall be taken to central control
room.
7. Safety distances as per preceeding Table-2 for blow down
facilities are for open pit location. If the blow down drum is
located underground, the distance from fired heater shall be
reduced from 30m to 15m.
8. Steam snuffing/purging valve shall be located minimum 15m
from only those equipments which are served bythe steam valve. 9.
Fuel Oil day tanks shall be located at a safe distance of 15m from
equipment except those facilities such as heat exchanger, pump
connected
directly with the Fuel Oil system. (Refer Table-5 for
interdistance between tanks). 10. Distance between fired heater and
distillation column shall be increased to 22.5m in case of light
ends such as Naphtha stabiliser. 11. Minimum distances between
equipment shall not be applicable for package items and their
related appertenances.
-
OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
13
7.0 LAYOUT OF STORAGE TANKS 7.1 GENERAL CONSIDERATIONS (i) DYKED
ENCLOSURES
(a) Petroleum storage tanks shall be located in dyked enclosures
with roads all around the enclosure. Aggregate capacity of tanks
located in one dyked enclosure shall not exceed following values
:
For a group of floating roof tanks : 120,000 cu.m. For a group
of fixed roof tanks : 60,000 cu.m. If a group of tanks contains
both fixed and
floating roof tanks, thenit shall be treated as a group of fixed
roof tanks for the purpose of above limits.
(b) Dyked enclosure should be able to contain
the complete contents of the largest tank in the tank farm in
case of any emergency. Enclosure capacity shall be calculated after
deducting the volume of tanks (other than the largest tank) upto
the height of the enclosure. A free board of 200 mm above the
calculated liquid level shall be considered for fixing the height
of the dyke.
However, for excluded petroleum, the
capacity of the dyked enclosure should be based on spill
containment but not for containment on tank rupture.
(c) The height of tank enclosure dyke shall be
at least one metre and shall not be more than 2.0 m above
average grade level inside. However, for excluded Petroleum, the
minimum height of dyke wall shall be 600 mm.
(d) Interdistance between the nearest tanks
located in two dykes shall be equivalent to the largest tank
diameter or 30m, which-ever is more.
(e) The tank or tanks shall be supported on
well designed foundations and shall be either buried underground
or installed in the open and surrounded by wall or embankment not
more than two meter high and made of earth, concrete or solid
masonry capable of withstanding fully hydrostatic load. Earth wall
of over 1 meter
high shall have not less than 0.6 meter wide flat section on
top. Note 2
(f) Pump stations should be located outside dyke areas by the
side of roads.
(g) Tanks located overhead for process
considerations shall meet safety distance and shall also have
dyked enclosure of RCC construction and provided with drain valves
at suitable height for easy operation.
(ii) GROUPING
(a) Grouping of petoleum products for storage
shall be based on the product classifi-cation. Class "A" and/or
class "B" petro-leum can be stored in the same dyked enclosure.
Class "C" petroleum should preferably be stored in separate
enclosure. However, where class "C" petroleum is stored in a common
dyke along with class "A" and/or class "B" petroleum, all safety
stipulations applicable for class "A" and/ or class "B"
respectively shall apply.
(b) Excluded petroleum shall be stored in a
separate dyked enclosure and shall not be stored along with
class A, B or C petroleum.
(c) Tanks shall be arranged in maximum two
rows so that each tank is approachable from the road surrounding
the enclosure. However, tanks having 50,000 cu.m capacity and above
shall be laid in single row.
(iii) FIRE WALLS In a dyked enclosure where more than one tank
is
located, fire walls of 600mm should be provided as explained
below: (a) Any tank having a diameter more than 30m
should be separated with fire walls from other tank.
(b) Fire walls should be provided by limiting
the aggregate capacity of each group of tanks within, to 20,000
cu.m.
(iv) GENERAL
(a) The tank height shall not exceed one and half times the
diameter of the tank or 20m whichever is less.
-
14 OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
(b) Piping from/to any tank located in a single dyked enclosure
should not pass through any other dyked enclosure. Piping connected
to tanks should run directly to outside of dyke to the extent
possible to minimise piping within the enclosures.
(c) No fire water/foam ring main shall pass
through dyked enclosure. (d) The minimum distance between a
tank
shell and the inside toe of the dyke wall shall not be less than
one half the height of the tank.
7.2 INTERDISTANCES BETWEEN TANKS / OFF-
SITE FACILITIES The following stipulations shall apply for the
inter distances for above ground tanks storing petroleum:
(i) Inter distances shall be as given in Table-3 for tanks
storing class "C" petroleum; or
class "A" and "B" petroleum products with total storage capacity
not exceeding 5000 cu.m at one installation.
(ii) Inter distances shall be as given in Table-4
for tanks storing class "A" and class "B" petroleum products
with total storage capacity exceeding 5000 cu.m
(iii) Interdistances between tanks and fencing
shall be as given in Table-6 for tanks storing Class "A", Class
"B" and Class "C" petroleum products with total storage capacity of
class "A" and class "B" petroleum stored exceeding 5000 cu.m
(iv) Interdistances between tanks storing
excluded petroleum will not be governed by Table-3 and 4 and
should be decided on construction, operation and maintenance
requirements.
-
OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
15
TABLE - 3 (NOTE1)
INTERDISTANCES BETWEEN TANKS/OFFSITE FACILITIES (For small
installations)
S.No. From \ To 1 2 3 4 5 6 7 8 9 10 11 12 13
1. Storage tank for 0.5 D 0.5 D 0.5 D 9 9 9 15 15 15 3 15 15 15
petroleum class A or 6 or 6
2. Storage tank for 0.5 D 0.5 D 0.5 D 9 0.5 D 0.5 D 9 4.5 4.5 3
4.5 D D petroleum class B or 6 or 6 min.4.5 min.4.5
3. Storage tank for 0.5 D 0.5 D - 9 0.5 D - 9 4.5 - - - 0.5 D
0.5 D petroleum class C or 6 or 6 min.3 min.3
4. Storage / filling shed 9 9 9 - 4.5 6 9 9 9 3 9 9 9 for
petroleum class A
5. Storage / filling shed 9 0.5 D 0.5 D 4.5 - 1.5 9 4.5 4.5 1.5
4.5 4.5 4.5 for petroleum class B
6. Storage / filling shed 9 0.5 D - 6 1.5 - 9 4.5 - - - 3 3 for
petroleum class C
7. Tank vehicle loading / 15 9 9 9 9 9 - 9 9 3 9 9 9 unloading
area for petroleum class A
8. Tank vehicle loading/ 15 4.5 4.5 9 4.5 4.5 9 - 4.5 1.5 4.5
4.5 4.5 unloading area for petroleum class B
9. Tank vehicle loading/ 15 4.5 - 9 4.5 - 9 4.5 - - - 3 3
unloading area for petroleum class C
10. Flame-proof electric 3 3 - 3 1.5 - 3 1.5 - - 3 - -
motors
Contd...
-
16 OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
TABLE - 3 (Contd...)
S.No. From \ To 1 2 3 4 5 6 7 8 9 10 11 12 13
11. Non-flameproof 15 4.5 - 9 4.5 - 9 4.5 - 3 - - - electric
motors
12. Office building, stores, 15 D 0.5 D 9 4.5 3 9 4.5 3 - - - -
amenities etc. within min. 4.5 min. 3 installation
13. Boundary fencing 15 D 0.5 D 9 4.5 3 9 4.5 3 - - - - around
installation min. 4.5 min. 3
Notes: 1. All distances are in metres.
2. Above table is applicable for installations where
i) Only petroleum class C is stored.
ii) The total quantity of petroleum class A and class B stored
above ground in bulk does not exceed 5000 cu.m.
iii) The diameter of any tank storing petroleum class A or
petroleum class B does not exceed 9m.
3. Interdistances given for tanks are shell to shell in the same
dyke.
4. All distances shall be measured between the nearest point on
the perimeter of each facility except in the case of tank vehicle
loading/unloading area where the distance shall be measured from
the centre of each bay.
5. Where alternate distances are stipulated, maximum thereof
shall be observed.
6. Notation :
"D" diameter of the tank
(-) a distance suitable for constructional and operational
convenience.
-
OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
17
TABLE - 4
INTERDISTANCES BETWEEN STORAGE TANKS/OFFSITE FACILITIES
S.No. From \ To 1 2 3 4 5 6 7 8 9
1. Storage tank for petroleum T5 T5 T5 15 15 15 15 8 15 class
A
2. Storage tank for petroleum T5 T5 T5 15 15 15 15 8 15 class
B
3. Storage tank for petroleum T5 T5 T5 15 - 8 - - - class C
4. Storage / filling shed for 15 15 15 - 8 15 15 8 15 petroleum
class A or class B
5. Storage/filling shed for 15 15 - 8 - 8 - - - petroleum class
C
6. Tank vehicle loading/ 15 15 8 15 8 - - 8 15 unloading area
for petroleum class A or B
7. Tank vehicle loading/ 15 15 - 15 - - - - - unloading area for
petroleum class C
8. Flame proof electric pump 8 8 - 8 - 8 - - 8 motor
9. Non-flame proof electric 15 15 - 15 - 15 - 8 - pump motor
Notes : 1. All distances are in metres.
2. Above table is applicable for installations where total
quantity of petroleum class A and class B stored above ground in
bulk exceeds 5000 cu.m or where the diameter of any such tank for
the storage of petroleum exceeds 9 m.
3. All distances shall be measured between the nearest points on
the perimeter of each facility except in the case of tank vehicle
loading/unloading area where the distance shall be measured from
the centre of each bay.
4. Notation:
(-) any distance suitable for constructional or operational
convenience.
T5 Table-5 shall be referred.
5. This table is applicable for class C petroleum storage also
alongwith class A & B petroleum as per limits specified under
note-2 above.
-
18 OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
TABLE - 5
INTERDISTANCES BETWEEN STORAGE TANKS
Sl. Item Floating Roof Fixed Roof Class C No. Tanks Tanks (Class
Petroleum A & B Petroleum 1. All tanks with diameters (D + D) /
4 (D + d) / 4 (D + d) / 6 upto 50 metres 2. All tanks with
diameters (D + d) / 4 (D + d) / 3 (D + d) / 4 exceeding 50
metres
Notes :
1. This table is applicable for installations where aggregate
storage capacity of class A and class B
petroleum stored above grade exceeds 5000 cu.m. or where the
diameter of any such tank for the storage of petroleum exceeds 9
m.
2. Distances given are shell to shell in the same dyke. 3.
Notation: D diameter of larger tank in metres d diameter of smaller
tank in metres 4. If the interdistance (for class A & B)
calculated as above are less than 15m,then minimum of 15m or
0.5
D or d shall be followed. 5. Interdistance between class A/B
storage tanks and classC storage tanks shall not be less than 6
metres.
-
OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
19
TABLE - 6 (NOTE1)
DISTANCES FROM BOUNDARY FENCING
Minimum Distance from Boundary S.No. Installation fencing around
Installation
1. Storage tank for Pet roleum Class A ** 2. Storage tank for
Petroleum Class B ** 3. Storage tank for Petroleum Class C ** 4.
Storage/filling shed for Petroleum 15 Class A or Class B 5.
Storage/filling shed for Petroleum 10 Class C 6. Tank vehicle
loading/unloading area 20 for class A & B petroleum 7. Tank
vehicle loading/unloading area 10 for class C petroleum
Notes :
1. All distances are in metres. 2. This table is applicable for
facilities in an installation where total quantity of petroleum
class A & B stored
above ground in bulk exceeds 5000 cu.m. or where the diameter of
any such tank for the storage of petroleum exceeds 9 m.
3. Notation: "D" diameter of larger tank in metres. 4. Above
table is based on the assumption that property beyond the boundary
line is either protected or
adequate green belt is provided as a safety buffer where no
structure exists. Property beyond property line is deemed protected
if it is within the jurisdiction of public Fire Brigade or plant's
own Fire Brigade.
** (I) Distance from Floating roof tank to boundary fencing for
stable and boil-over liquids, having
protection for exposure shall be D/2 (minimum 20m).
(ii) For tanks with weak roof-to-shell joint :
The above distance shall be D/2 (minimum 20m) for tanks having
approved foam or inerting system and the tank diameter not
exceeding 50m.
-
20 OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
8.0 LAYOUT OF LPG FACILITIES
8.1 GENERAL CONSIDERATIONS
8.1.1 LPG STORAGE (i) GROUPING Vessels shall be arranged into
groups each
having a maximum of six vessels. Capacity of each group shall be
limited to 15000 cu.m. Each group shall be provided with a curb
wall.
Any vessel in one group shall be separated from
a vessel in another group by a minimum distance of 30m.
Spheres and bullets shall be treated as separate
groups with 30m safety distance between two groups. Separate
dedicated manifold shall be provided for each group.
ii) LOCATION (a) Longitudinal axes of horizontal vessels
(Bullets) should not point towards other vessels, vital process
equipments and control room.
(b) Storage vessels should be located down
wind of process units, important buildings and facilities.
(c) LPG storage vessels shall not be located
within the same dykes where other flammable liquid hydrocarbons
are stored.
(d) Storage vessels shall be laid out in single
row both in case of the spheres and bullets. Storage vessels
shall not be stacked one above the other.
(iii) SPILLS AND LEAKS (a) Spillage collection shallow sump
shall be
located at a distance where the flames from sump fire will not
impinge on the vessel. This distance shall not be less than the
diameter of the nearest vessel or 15m whichever is higher. The
capacity of the collection sump shall be as per drawing enclosed at
Annexure-1. However in case of one sphere, the sump size shall be
equal to layout of two spheres.
(b) Curb wall around the storage tank shall have a minimum
height of 30cm. However
it shall not exceed 60cm at shallow sump position, as otherwise
evaporation of spilled LPG may get affected.
(c) There shall not be any depressions, large
ditches and low lying areas around LPG storage as the leaked gas
can accumulate, being heavier than air. Top surface of the vessels
installed in a group should be on the same plane so that safety
blowout from one vessel does not affect the other vessel. This will
also minimise the chances of overfilling of adjoining vessels due
to gravitation.
(d) A typical layout plan of LPG sphere area
with major safety requirements of distan-ces, drainage sump,
pump station location etc. is enclosed at Annexure-1 for general
guidance.
8.1.2 LPG BOTTLING (i) LOCATION LPG bottling facilities should
be located at a safe
distance from other facilities with minimum ingress to trucking
traffic and downwind to storage as far as possible.
There shall not be any deep ditches in the
surrounding area to avoid LPG settling. (ii) CONSTRUCTION
Bottling section shall be of single storey having
roofing and open from sides for adequate ventilation so that
leaked gas can drift away. RCC roofing should not be used to the
extent possible.
(iii) OPERATION (a) Stacking areas for empty and filled
cylinders should be located separately. Cylinders shall be
stacked vertically. Filling machines and testing facilities shall
be organised in sequential manner distinctly in a separate
area.
(b) Filled LPG cylinders shall not be stored in
the vicinity of cylinders containing other gases or hazardous
substances.
(c) Storage shall be kept on or above grade and never below
grade in cellar or basement.
-
OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
21
(d) Trucking traffic shall be smooth to avoid blocking/
obstruction for loading and unloading of cylinders.
8.1.3 LPG BULK HANDLING (i) LOCATION (a) LPG truck
loading/unloading station shall
be located in a separate block and shall not be grouped with
other products.
Maximum number of LPG tank lorry bays
shall be restricted to 8 in one group. The bay should be
designed in such a way that the driver's cabin will be facing the
exit direction and shall have no obstruction.
(b) LPG rail loading/unloading station shall be
located on a separate rail spur and shall not be grouped with
other products.
(c) LPG loading/unloading rail gantries shall be
separated from other rail shunting facilities by a minimum
distance of 50m, except relating to service for the same
gantry.
(ii) Rail loading/unloading of LPG should be restricted
to a maximum of half rake, presently capacity of which is 500
MT. If full rake loading/unloading is envisaged, this shall be done
on two separate rail gantries having a minimum distance of 50m. In
case of 8 wheeler wagons half rake unloading/ loading capacity
shall be 600 MT.
8.2 INTERDISTANCES FOR LPG FACILITIES Interdistances for LPG
facilities shall be as given
in Table-7.
-
22 OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
TABLE - 7
INTERDISTANCES FOR LPG FACILITIES
S.No. From \ To 1 2 3 4 5 6 7
1. LPG Storage vessels * T8 30 30 30 15 60 2. Boundary/property
line/ T8 - 30 30 30 30 ** group of buildings, not associated with
LPG plant 3. Shed-LPG/Cold repair shed/ 30 30 15 30 30 15 60
cylinder evacuation facilities 4. Tank Wagon Gantry 30 30 30 50 50
30 60 Tank Truck Gantry 5. Rail spurs 30 30 30 50 50 30 60 6. Pump
house/Comp. 15 30 15 30 30 - 60 house(LPG) 7. Fire Pump house 60 **
60 60 60 60 -
Notes :
1. All distances are in metres. 2. Notation: T8 Refer Table - 8
* 1/4 of sum of diameters of adjacent vessels or half the diameter
of the larger of the two adjacent
vessels whichever is greater. ** Any distance for operational
convenience. 3. Distance of stabling line shall be as per minimum
Railway Standards.
-
OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
23
TABLE - 8 (NOTE1)
INTERDISTANCES BETWEEN LPG STORAGE VESSELS AND BOUNDARY /
PROPERTY LINE / GROUP OF BUILDINGS
NOT ASSOCIATED WITH LPG FACILITIES
Capacity of S.No. Each Vessel Distance (Cum.M. of water)
1. 10 - 20 15 2. 21 - 40 20 3. 41. 350 30 4. 351 - 450 40 5. 451
- 750 60 6. 751 - 3800 90
Note : All distances are in metres.
-
24 OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
9.0 LAYOUT OF UTILITY STATIONS 9.1 GENERAL CONSIDERATIONS Boiler
House, Air compressors, fuel oil facilities (for generation of
steam) shall be located in separate block adjoining the process
unit blocks. The steam generation facilities block should
preferably include boiler feed water pump, chemical block for
boiler house etc., which form the integral part of the steam
generation facilities. The plant air compressors and drying units
should preferably be located in the boiler house unit block. Fuel
oil heating and pumping facilities may also be located within the
boiler house unit block. These may be located in the boiler house
unit block to minimise the spreading ofvarious utility blocks
around the process unit, to facilitate ease of operation. ( i)
ELECTRICAL Electrical generation facilities should be located
near the process unit block because such electrical generation
units normally supply steam to the process units e.g. Cogeneration.
When external power grid is interconnected with plant power
generation facilities, either the power plant shall be located at
the side of boundary wall or the external power transmission lines
shall be taken underground upto the interconnection grid inorder to
minimise the length of overhead transmission lines within the
plant.
(ii) COOLING TOWERS Cooling towers should be located away
from
process unit area, preferably downstream direction of wind to
avoid corrosion of the equipments in process areas.
(iii) WASTE DISPOSAL FACILITIES Separate collection system
should be provided for
different types of waste generated in the process plant such as
oily water, cooling tower blowdown, caustic and acidic effluents,
sludge, fecal etc.
The waste disposal facilities like effluent channels, land fill
areas for disposing off solid waste etc. should preferably be
located by the side of boundary wall, but down stream of wind
direction so that the foul odour that may be present at times does
not affect the plant personnel and neighbourhood areas. Locating
the waste disposal facility near the boundary wall also eliminates
the vehicular movement in process areas in case solid wastes are to
be taken out of installation for disposal.
iv) SMOKING BOOTHS Smoking booths should not be provided in
hydrocarbon industry. However if it is necessary to provide
smoking booths, these should be located at a safe distance of :
(i) 30m from hydrocarbon source in case of oil
refinery/storage installation.
(ii) 60m from hydrocabon source in case of LPG/Gas Processing
Plants.
9.2 INTERDISTANCES Interdistances between various utility
stations
and other facilities shall be as given in Table-1.
10.0 REFERENCES
1. OISD-STD-106 on Process Design and Operating Philosophies on
Relief and Disposal Systems.
2. OISD-STD-144 on LPG Bottling and Distribution.
3. NFPA Standard No.30 "Flammable and Combus-tible Liquids
Code".
4. Petroleum Rules - 1976.
5. OISD-STD-117on Fire Protection facilities for Petroleum
depots and terminals.
6. OISD-STD-116 on Fire Protection facilities for Petroleum
Refineries/process plants.
7. SMPV Rules - 1981.
-
OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
25
ANNEXURE - 1
-
26 OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
-
OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
27
NOTES
-
28 OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
NOTES
-
OISD-STD-118 Revision - II
"OISD hereby Expressly Disclaims any liability or
Responsibilities for Loss or Damage Resulting from the use of the
OISD Standards/Guidelines."
29
NOTES