© 2019 Department of Petroleum Resources. All rights reserved Department of Petroleum Resources (DPR) PROCEDURE GUIDE

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1.1 Application     
This procedure applies to all equipment used in the process of determining the quantity and 
quality of bulk petroleum and petroleum products at all facilities. 
Specifically, the following equipment and devices shall be covered by the procedure: 
 i)      Thermometers 
ii)      Hydrometers/Densitometers 
iii)     Steel Tapes 
iv)     Storage Tanks (upright cylindrical types) 
v)      Storage Tanks (horizontal cylindrical types) 
vi)     Storage vessels (Barges/FPSO/FSO) 
vii)    Trailer Mounted Tanks (Tank Cars) 
viii)   Pressure measuring instruments 
1.2    General Guidelines 
1.2.1   All these equipment shall be calibrated by an approved authority or accredited 
corporate body and in accordance with the procedure specified for each equipment 
and shall be witnessed by representative(s) of the Department of Petroleum 
Resources. Field Data/results generated shall also be reviewed and endorsed by the 
representative(s). Where data is to be inputted for tank tables computation, 
representative(s) of Department of Petroleum Resources shall participate. 
1.2.2      In all cases, calibration companies shall be pre-qualified by the Director of Petroleum 
Resources. The validity period of a calibration certificate or table shall be as stated 
for each equipment and no equipment shall be accepted for use for measurement at 
any facility outside the validity period of its calibration certificate. 
1.2.3     All equipment calibration shall be done locally except in cases where the facilities are 
not available locally in which case appropriate approval shall be obtained from the 
Director of Petroleum Resources for offshore calibration of such equipment. 
1.2.4     Conditions for accrediting Corporate Bodies and Agencies to carry out equipment 
calibration shall be set out for each equipment type and shall form the basis of 
approval by the petroleum Resources of the certificate or table issued after a 
calibration exercise.