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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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ii. 
Plastic pipe materials shall not be used in any service where the maximum and 
minimum operating temperatures shall be higher or lower than 100F and 20oF 
respectively 
iii. 
Plastic pipe materials to be used shall be inhibited against the effect of Ultraviolet 
rays which renders such materials brittle when exposed to sun light  
iv. 
Plastic pipes or tubing shall not be threaded at joints but shall be joined by the 
solvent cement method, adhesive method, and heat-fusion or by the means of 
compression coupling or flanging whichever conforms to the manufacturer’s 
specifications. 
v. 
Extreme caution shall be taken in laying plastic pipelines to avoid any damages to 
the material. All buried plastic pipelines of ½ inch nominal diameter and above 
shall have a minimum wall thickness of 0.1 inch while those below ½ inch nominal 
diameter shall have a wall thickness not less than 0.06 inch. 
vi. 
Plastic pipes shall be buried in undisturbed or well-compacted soil while no mitre 
bends shall be permitted at any portion of the pipeline. 
vii. 
Plastic pipes shall be tested at pressure not less than 150 percent of their 
maximum operating pressure or 50 PSI whichever is greater and shall not on any 
occasion be subjected to a pressure more than 300 percent of their maximum 
operating pressure.  
viii. 
Certificate of conformity to required specifications shall amongst other items 
provide information on the following parameters for plastic gas transmission 
system: 
A. Compound 
i. Conventional density 
ii. Volatile content 
iii. Water content 
iv. Carbon Black dispersion  
v. Resistance to gas condensate 
vi. Resistance to Rapid crack propagation (critical pressure, Pc) (e>/= 15mm) 
vii. Resistance to slow crack growth (dn: 110mm or 125mm- SDR 11) 
viii. Tensile strength for butt fusion (dn:110mm or 125mm- SDR 11)