Library / 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

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

Page 31 of 48

Open the PDF at page 31

 
 
 
 
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  
 
25 
and shall be inhibited against material degradation effects of ultra-violet rays if 
used in locations where the pipeline is exposed to sunlight. 
iv. 
Weldability of the ferrous pipe material shall be tested in accordance with the 
requirements of API standard 1104 and other internationally recognised 
standards approved by DPR. 
v. 
Adequate provision shall be made for the flexibility of the pipeline while under 
pressure in the form of anchorage and guide points and for temperature induced 
stresses by allowing for expansion joint couplings. 
4.2.1  Design and Construction of Gas Pipeline   
The design and construction of new gas pipelines, the replacement of existing ones and 
their corresponding corrosion control installation shall conform to the standards and 
codes specified in ASME B31.8-2018 , National Association of Corrosion Engineers 
Standards generally referred to as NACE SP0169-2013 and other international recognised 
standards approved by DPR. The follow shall apply at the minimum: 
a. The process of manufacture of the specified pipeline system shall generally 
comply with the various specifications of API 5L or its internationally recognised 
equivalent.  
b. It shall be expected that operator or owner of a licensed pipeline system shall 
maintain in its custody sufficient manufacturing records and data to substantiate 
that acceptable industry standard was employed in the production of the pipeline 
system. Such records include: 
i. 
Manufacturing records such as incoming material inspection reports, 
welding procedure specification / procedure qualification records, in-
factory mechanical and chemical test records  
ii. 
NDTs results, calibration data or certification of test equipment, approved 
ITPs and marking schemes, material traceability, dimensional checks. 
iii. 
Report of workmanship/defects examinations carried out during 
manufacturing processes etc. 
c. Long distance gas transmission pipelines shall be made of steel, the design and 
construction of which shall be governed by the population density indices 
specified in ASME B31.8-2018 and the corresponding design factors. Also, the