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

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

Page 76 of 194

 
 
 
 
Applicable to all Oil & Gas Operators  
GUIDELINES FOR THE ESTABLISHMENT OF AN AUTOGAS 
REFUELLING STATIONS AND  ADD-ON GAS FACILITY IN NIGERIA 
Code: DPR Guide 0042 - 2020 
 
Revision Date: 1st September 2020 
 
 
 
This is a property of the Department of Petroleum Resources. All rights reserved  
 
23 
systems. The space between the inner container and the outer container shall 
contain insulation that is compatible with LNG and is non-combustible. 
xi. Storage vessels shall be spaced and located in accordance with the provisions of 
this document. The layout shall consider the effects of a release of a cryogenic 
liquid such that any release can rapidly evaporate and have minimum effect on the 
storage tank supporting structure, such that the storage tank will remain 
adequately supported. 
xii. Ground features such as open drains, manholes, gullies and cellar hatches, within 
the separation distances should be sealed or trapped to prevent the passage of 
LNG vapour. 
xiii. The minimum separation distance between any type of LNG container of capacity 
265,000 liters equivalent water capacity shall be at least 15m. Refer to Table 3.1.  
3.4.4.1 LNG Boil-Off Gas Handling  
i. Boil-off and flash gas shall be set to discharge into a closed system or into the 
atmosphere such that they do not create a hazard to people, equipment or 
adjacent properties. 
ii. Boil-off venting systems shall be designed so that it cannot inspirate air during 
normal operations. 
3.5 
Facility Connecting Pipework and Valves 
Piping, Valves and fittings are to be fabricated, installed, and tested in line with 
international standards such as ASME Process Piping Code or any other applicable codes 
recognised by DPR.  Any exterior piping shall be buried or installed above ground and 
supported and protected against mechanical damage. Additionally, the following shall 
apply at a minimum: