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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: Six months after the completion of construction, the licencee shall submit two 
copies of the as built plan of the pipeline on the same scale as that of the plan submitted 
along with the pipeline licence. 
3.4 Procedure For Inspection and Testing.  
The Licencee shall notify the Department of the completion of construction of the pipeline 
or any sections of it which is due for testing giving notice of not less than one month from 
the date of commencement of such tests.  Inspection shall be guided by the following: 
The pipeline material and construction shall be inspected visually and examined radio 
graphically according to the procedure enumerated in Chapter VI of the reference 
standard ASME B 31.4 – 2019 and internationally recognised standards approved by DPR. 
a. All tests shall generally be hydrostatic and be conducted in a manner that will 
ensure the protection of life, property, and the general environment of the 
pipeline. 
b. The entire length of the pipeline shall be tested to the designed rated pressure 
while any in-line pressure vessel or prefabricated manifold on the pipeline shall 
be tested to the manufacturer’s specifications in accordance with the Mineral 
Oils Safety Regulations (MOSR). 
c. The pressure recording instruments to be used for the tests shall have a valid 
calibration certificate which should not be more than a year of issue and the chart 
record of the test shall be continuous and legible and all test results and any 
remedial action taken shall be submitted to the Department for approval before 
commissioning of the pipeline. The Accuracy of the pressure recorder shall be 
within two per-cent (2%) of its range. 
d. Unless otherwise permitted by the DPR, pressure test duration shall not be less 
than four hours of continuous test both for leaks and material failures. Buried 
pipeline of up to 100 meters in length and all surface running pipelines could be 
tested for less periods but not lower than (1) hour. 
e. The general guiding rule for environmental protection shall be as follows: 
i. 
Where the test pressure shall result in a hoop stress greater than 75 percent 
of specified minimum yield strength of the pipeline based on the nominal