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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  
 
23 
3.5.1  External Corrosion Control of Buried or Submerged Pipeline 
This shall consist of application of coating to the pipeline and its cathodic protection to 
achieve the following objectives: 
A. Protective Coating 
i. 
Shall be applied in such a way that it will mitigate corrosion and adhere to the 
pipe metal surface sufficiently enough such that it will effectively resist under film 
migration. 
ii. 
Shall be ductile and strong enough to resists cracking and damage during 
handling and under soil stress. 
iii. 
Shall be compatible with any supplemental cathodic protection and if is an 
insulating type material shall have low moisture absorption. 
iv. 
Shall be applied in such a way that no irregularities protrude through it and no 
holiday gaps exist in the coating all along the whole length of the pipeline. 
v. 
The points of connection of any attachment to pipeline shall be equally sealed 
with the coating, together with the attachments themselves. 
B. Cathodic Protection System 
i. 
This shall be provided by either a galvanic anode or impressed current anode 
system installed in such a way that it mitigates corrosion and contains method of 
determining the degree of cathodic protection achieved on the pipeline. The 
criteria for the selection of an appropriate protection system shall be as listed in 
NACE SP0169-2013 and relevant subsequent provision, including other 
internationally recognised standards approved by DPR. 
ii. 
The system shall be installed not later than one year after the laying of the 
pipeline in such a way that the pipe coating at the points of installation is kept 
intact. 
iii. 
The cathodic protection system shall be electrically isolated at all inter-
connections to other pipeline systems or structures except where the two 
structures are mutually protected by the same system. 
iv. 
The cathodic system shall be protected against damage by atmospheric electrical 
discharges, underground cables and power lines.