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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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Note: An application for transfer of OPLL, which has been issued, shall be accompanied 
by a payment of N 500,000:00 only, made payable to the Department of Petroleum 
Resources as processing fees. 
3. LIQUID PETROLEUM TRANSPORTATION PIPING SYSTEMS 
3.1 Definition 
Liquid Petroleum shall include crude oil, refined products, Natural Gas Liquids, 
condensates, and liquefied Petroleum Gas.  
3.2 Minimum Design Criteria 
The design criteria prescribed herein shall apply to new pipeline systems, relocation or 
replacement and upgrading of existing pipelines.  
a. The two commonly acceptable grade of line pipes for this service shall be either 
those materials conforming with the ASTM A106 Grade B or API 5L Grade B for 
low pressure range and any of the API 5LX range for high working pressure or 
large diameter pipeline where a lower grade will require excessively thick walls 
to cope with the desired working pressures 
b. The line pipe shall be seamless in fabrication and be Electric Resistance Welded 
(ERW) or Double Submerged Arc Welded (DSAW) types only. 
c. The design shall generally be in accordance with the standard ASME B31.4-2019 
and its subsequent revisions published by the American Society of Mechanical 
Engineers under the title “Pipeline Transportation Systems for Liquids and 
Slurries”. In addition to the general provisions of the code, special attention shall 
be paid to the following: 
i. 
Wave and current loads shall be taken into account in the stress calculation 
of pipelines to be laid at sea or riverbeds without burial. 
ii. 
Calculation of limit stresses due to sustained load, thermal expansion, and 
occasional loads where applicable shall be strictly in conformity with 
paragraph 402 of the code. 
iii. 
Design and material selection of the pipeline components such as tees, 
elbows, bends, valves, fittings etc. shall in all respects, conform to chapters 
II and III of the code.