These interdistances are based on OISD Standard 118, Table 1.

From Block :

Process UnitsProcess Control RoomStorage Tanks Class-AStorage Tanks Class-BStorage Tanks Class CPressurised Storage: LPG/ C4 & Lighter / H2Flare (Note-7)Bulk Loading POL (Rail /Road)Bulk Loading LPG (Rail /Road)Fire Station / First Aid CenterBoiler house / Process Unit Heaters (Note-11)Rail SpurBoundary wall around installationService buildingsCooling tower,API Separators / Oil sludge pitElectrical Sub Station (Note 13)

To Block:

Process UnitsProcess Control RoomStorage Tanks Class-AStorage Tanks Class-BStorage Tanks Class CPressurised Storage: LPG/ C4 & Lighter / H2Flare (Note-7)Bulk Loading POL (Rail /Road)Bulk Loading LPG (Rail /Road)Fire Station / First Aid CenterBoiler house / Process Unit Heaters (Note-11)Rail SpurBoundary wall around installationService buildingsCooling tower,API Separators / Oil sludge pitElectrical Sub Station (Note 13)

Distance as Per OISD 118 Table 1

Relevant Notes :

1. All Distances are in Meters.
2. Note 2 : Type of construction shall be as per OISD-STD-163.
3. Note-7 The distances specified are for the elevated flare. For ground flare, these distances shall be 150 m. For Exploration & Production installations, this shall be in line with Oil Mines Regulations
4. Note-11: Boiler house or heater of a process unit is to be treated as a separate identity only for the consideration of surrounding blocks / facilities. However, heater of a process unit remains an integral part of the process unit to which it is attached and in that case the inter equipment distances should be inline with Table –2.
5. Note 13: Separation distance of electrical substation was added in table 1 in January 2006 based on decision in 40th steering Committee Meeting in De’05.