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Applicable to all Oil & Gas Operators GUIDELINES FOR THE DESIGN, CONSTRUCTION, OPERATION AND MAINTENANCE OF OIL AND GAS PIPELINE SYSTEMS IN NIGERIA Code: DPR Guide 0027 – 2021

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Applicable to all Oil & Gas Operators  
GUIDELINES FOR THE DESIGN, CONSTRUCTION, OPERATION AND 
MAINTENANCE OF OIL AND GAS PIPELINE SYSTEMS IN NIGERIA  
Code: DPR Guide 0027 – 2021 
 
Effective Date: 14th October 2021 
 
This is a property of the Department of Petroleum Resources. All rights reserved  
 
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v. 
Except for underwater pipelines, sufficient test leads shall be installed on buried 
pipelines for occasional check of the effectiveness of the cathodic protection to 
be carried out by electrical measurements. Such test stations shall include all pipe 
casing installations, insulating joints, all crossings and main manifold junctions. 
vi. 
A minimum separation of 3 meters shall be maintained between electric 
transmission tower footings, ground cables and earthing, power lines and the 
pipelines under protection. 
3.5.2  Internal Corrosion Control 
i. 
The general rule shall be the avoidance of transportation of any corrosive 
materials in a pipeline without appropriate measure taken to mitigate the 
corrosion effect of the commodity on the internal section of the pipeline. 
ii. 
Internal corrosion shall be prevented either by frequent pigging, inhibiting, 
scraping or application of internal coating on the pipeline before laying. 
iii. 
Whichever method is used, appropriate precautions shall be taken, such as the 
utilization of sufficient coupon holders when inhibitors are used and the 
compliance with established industry standards of internal coating materials. 
4. GAS TRANSMISSION AND DISTRIBUTION PIPELINE 
4.1 
General Design Considerations  
This section covers the design, fabrication, installation, inspection, and testing, of gas 
transmission and distribution systems. It shall apply to piping systems required to operate 
with temperature of between 450F (232 deg. Celsius) and minus 20F (-7 deg. Celsius) only. 
4.2 
 Design Criteria and Materials Specifications     
Applicable standard shall be the ASME B31.8-2018 or its subsequent editions under the title 
“Gas Transmission and Distribution Piping Systems”. Other internationally recognised 
standards approved by DPR are applicable. The minimum requirement are as follows: 
i. 
All materials to be used shall generally conform to the specifications in appendix 
B of the reference Standard ASME B31.8-2018 for structural materials of the line 
pipe, valves, fittings, flanges, bolting and tubings. 
ii. 
The pipelines shall be generally seamless or of the ERW and DSAW types. 
iii. 
Thermoplastic and thermosetting pipe materials shall also be acceptable 
provided that they conform to ASTM specifications 02513 and 02517 respectively