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

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Where,
Height = Incremental height of the tank.
M/D = Ratio of incremental height to the spread diameter.
Kc = Ratio of area of the full circle of the cylinder to that of the segment
given by standard table.
Kn = Co-efficient of the ratio of the volume portion of the head to the
total volume of head at the respective incremental height given by the
standard table.

Prepared By: Approved By:

……………………… …………………………….
Calibration Company Rep Director of Petroleum Resources

2.7 Calibration of Storage Vessels (Barges/FPSO/FSO/Coastal Vessels)
2.7.1 Application
This procedure and that for the calibration of Tank Cars shall be followed in fulfilling the
requirement for the certification of receptacles used for transportation of liquid petroleum
products in accordance with Part II of the Petroleum Regulations of 1967.
2.7.2 Accreditation
This shall be on annual basis and in accordance with the procedure outlined by the
Department of Petroleum Resources for registering Oil Industry Service Companies.
Calibrating Companies, before accreditation, shall always be required to show evidence of
expertise and equipment with which to conduct such exercises up to the standards
specified herein.
2.7.3 Principle
The underlining principle for this procedure is to obtain the linear incremental volume of
each tank in the storage vessels taking into consideration their design and construction
features. Appropriate correction shall be made for the chamber, expansion hatches and all
the deadwood in the form of stiffeners, pipelines, valves etc. The recommended method
shall be to dry-dock the storage vessels on even keel and inject measured known quantity
Height
M/D
Kc of Cylinder Kc * Vol of
Cylinder
Kn of
Head
Kn*Vol
Head
Partial
Vol.
Interv.
Vol.