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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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B.        Pipeline 
i. Hydrostatic strength (20 deg centigrade, 100h, 80 deg c, 165h, 80 deg c,1000h) 
ii. Elongation at break 
iii. Resistance to slow crack growth e</= 5mm (Cone test) 
iv. Resistance to slow crack growth e> 5mm (Notch test) 
v. Resistance to rapid crack propagation (critical pressure, Pc) 
vi. Oxidation induction time (Thermal stability) 
vii. Melt mass flowrate (MFR) 
viii. Longitudinal reversion 
C.         Valves 
i. Resistance to weathering 
ii. Leak-tightness of seat and packing  
iii. Actuation mechanism resistance  
iv. Resistance to bending between supports 
v. Thermal cycling resistance dn>63mm 
vi. Leak-tightness under bending with thermal cycling, dn</= 63mm 
vii. Leak-tightness under tensile loading 
viii. Leak-tightness under and after bending applied to the operating mechanism 
5.   FLOWLINE, PIPELINE & RISER SYSTEMS FOR OFFSHORE OPERATIONS 
5.1 Basic Statutory Approvals 
Basic statutory pipeline approvals applicable to offshore flowline, pipelines and riser 
systems shall as a minimum be as given in section 3. 
5.2 Design Criteria 
In addition to the general requirements of Sections 3 & 4 of this guideline, proper design 
consideration shall be given to establish acceptable / tolerable limits for the design of any 
Flowline and Riser System in the Nigerian offshore and deep offshore locations. API STD 
2RD and API RP1111-2015 shall form the additional basic reference codes / standards for the 
design of these systems. 
Where model studies will be carried out for any of the systems associated with the FLRs, 
for the purpose of guaranteeing any design / technological procedure, the company shall 
notify the Department of Petroleum Resources at least four (4) weeks prior to the conduct