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GUIDE FOR THE ESTABLISHMENT AND OPERATIONS OF DOWNSTREAM GAS FACILITIES IN NIGERIA (LPG, CNG, LNG) ISSUED BY

Page 178 of 194

 
 
 
 
Applicable to all Oil & Gas Operators  
GUIDELINES FOR THE ESTABLISHMENT AND OPERATIONS OF A GAS 
RETICULATION FACILITY IN NIGERIA 
Code: DPR Guide 0028 - 2020 
 
Revision Date: 1st September 2020 
 
 
 
This is a property of the Department of Petroleum Resources. All rights reserved  
 
13 
ix. 
Minimum separation distances from a building, boundary or fixed source of ignition 
to underground or mounded tanks of 10 Tons capacity or less shall be 3 meters, and 
7.5 meters for tanks above 10 tons capacity. 
x. 
Separation distances for all underground and mounded storage tanks shall be 
measured from the pressure relief valve and the filling connection. 
xi. 
The installation shall be accomplished with appropriate equipment that ensure the 
underground tanks are not dropped, dragged or handled with sharp objects. 
xii. 
The installation of the underground tanks shall be in such a way that enables easy 
removal without jeopardising the safety or integrity of adjacent tanks or 
infrastructure. 
xiii. 
Where the soil may be corrosive, the tank shall be set on a clean shingle or sweet 
sand free of extraneous materials to avoid seepage of products to underground 
water courses or any drainage system. 
xiv. 
Foundations and sub-soil shall be examined and prepared to support the tank to 
prevent movement, uneven settlement or concentrated loading in the tank shell. 
3.3.1.1 
Corrosion Protection for Buried Tanks 
i. 
A suitable system of cathodic protection (typically sacrificial anode for small 
installations and impressed current for large installations) shall be provided.  
ii. 
External surfaces of the tank should be suitably prepared and treated with a 
coating manufactured and applied in accordance with a recognised standard, to 
both protect against chemical and mechanical damage and minimise cathodic 
protection current drain. 
3.3.2 
Requirements for Skid and Containerized Facility  
The following shall apply for standalone containerized and skid-mounted facilities: 
i. 
They shall meet same requirements and safety distances in  Table 3.1 and Table 3.2 
of autonomous refilling plants.