The Oil Industry Safety Directorate (OISD) is a regulatory and technical directorate in India. It was established in by Ministry of Petroleum and Natural Gas. OISD – STD. INDEX. SECTION. CONTENTS. Introduction. Scope. Definitions. Plant Layout Philosophy. Layout of Blocks/Facilities. 11 Feb A: Neeraj Bagai, OISD, [email protected] Clause of OISD STD clearly ask for dyke around storage tanks whether it is class A.

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Clearance shall be provided for movement between reboiler and tower. Liquids which have flash point of 23 oC and above but below 65 oC. Grouping of petoleum products for storage shall be based on the product classification.

Above table is applicable for installations where total quantity of petroleum class A and class B stored above ground in bulk exceeds cu. Flares-elevated 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 8. Property beyond property line is deemed protected if it is within the jurisdiction of public Fire Brigade or plant’s own Fire Brigade.

The plant air compressors and drying units should preferably be located in the boiler house unit block. Pumps handling hydrocarbons and materials above the temperature of degree C should not be installed underneath the air fin coolers. Excluded petroleum shall be stored in a separate dyked enclosure and shall not be stored along with class A, B or C petroleum.

Oil Industry Safety Directorate

Filling machines and testing facilities shall be organised in sequential manner distinctly in a separate area. Petroleum Rules – However for petroleum depots and terminals, it shall be as per clause 4. Care shall be taken to facilitate future expansion without any interferene to plant on-stream.

This distance shall not be less than the diameter of the nearest vessel or 15m whichever is higher. Installation Minimum Distance from Boundary fencing around Installation 1. However, for excluded Petroleum, the minimum height of dyke wall shall be mm. Storage vessels shall not be stacked one above the other.

Gas compressors Hydrocarbon Adequate space should be provided around 1118 boxes for ease of operation and maintenance.

Space should be provided for removal and cleaning of heater tubes besides approach for crane. Requirements for erecting tall structures should be studied before finalising the layout. Blow down facility pumps, drums, stacks 30 15 15 15 20 15 15 15 15 15 15 16 15 15 15 15 15 – 15 15 Drilling activities and facilities upstream of the christmas tree of a well are not covered under this definition.

Each group shall be provided with a curb wall. 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.

Flares-ground 9. Cylinders shall be stacked vertically. Air fin coolers should be installed above the pipe rack. Any vessel in one group shall be separated from a vessel in another group by a minimum distance of 30m.

Maximum number of LPG tank lorry bays shall be restricted to 8 in one group. Process Unit – a unit having integrated sequence of operationphysical and chemical, and may involve preparation, separation, purification, or change in state, energy content or composition.

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. This standard will however create awareness and help in selective implementation of the recommen-dations at existing installations. Distances given are shell to shell in the same dyke. Layout planning should be in sequential order of process flow.

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.

Hence they may be located at one place so that common connecting platform can be provided. Cooling towers, water storage, nitrogen plant 30 30 30 30 30 30 90 30 30 30 15 30 30 – 15 Air Fin Pisd 15 3 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.

Distance between fired heater and distillation 181 shall be increased to Water spray Deluge valve 15 15 15 15 15 15 15 15 15 15 15 5 5 15 15 – 15 15 – – There shall not be any deep ditches in the surrounding area to avoid LPG settling.

Liquids which have flash point of 65 oC and above but below 93 oC. Distances between the reactor and furnace when directly connected process-wise, can be relaxed to 5m.

Enclosure capacity shall be calculated after deducting the volume of tanks other than the largest tank upto the height of the enclosure. Process 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 Tank height is the: Piping connected to tanks should run directly to outside of dyke to the extent possible to minimise piping within the enclosures.

Storage tank for petroleum class A 0. Coal based power plants should be located away from criticalfacilities like air separation plants, electrical installations etc. Storage tank for petroleum class C T5 T5 T5 15 – 8 – – – 4.

Oil Industry Safety Directorate – Wikipedia

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 oise vessel. Class “C” petroleum should preferably be stored in separate enclosure.

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