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 112 of 194

 
 
 
 
Applicable to all Oil & Gas Operators  
GUIDELINES FOR THE ESTABLISHMENT AND OPERATIONS OF GAS 
STORAGE AND UTILISATION FACILITIES IN NIGERIA 
Code: DPR Guide 0020 - 2020 
 
Revision Date: 1st September 2020 
 
 
 
This is a property of the Department of Petroleum Resources. All rights reserved  
 
21 
ii. Special protection such as coatings or cathodic protection shall be considered and 
applied for pipe systems and valves.  For LNG connections, vacuum insulation of 
cryogenic pipes in ducts may apply. 
iii. Where practical, pipe shall be continuous, unjointed and uninterrupted. Where 
there are breaks in continuity of pipework, consideration shall be given to electrical 
bonding across the joint.  Threaded pipe and fittings are not allowed underground 
iv. Manual shut-off valves, emergency shut-off valves, overpressure shut-off valve, 
flow check valves, non-return valves and back flow check valves used in piping 
systems shall conform to applicable standards.  
v. Relief and safety valves shall be inspected by a DPR accredited consultant and 
witnessed by the Department every thirty (30) months or at such shorter intervals 
as shall be necessary to maintain them in satisfactory condition.  
vi. All pipework shall that are insulated should accessible to facilitate periodic 
inspection, examination and/or testing. 
 
3.5.1 
 Pressure Relief Systems 
Relief devices shall be designed such that the operations, safely disperses contents 
without the risk of accumulation, ignition, or impingement on personnel, equipment and 
buildings.  The following shall, at the minimum, apply: 
i. All vents including those of safety relief devices and purge valves shall be 
connected to a vent stack and/or any other boil-off gas utilization systems put in 
place. 
ii. All vent systems shall be adequately supported to cope with loads created during 
discharge, as well as those created by the weather e.g. wind loading. 
iii. Natural gas vent lines shall terminate in a safe area at high level therefore, vent 
systems shall be designed to discharge vertically upwards.