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

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tank for the simple reason that the stock in that tank had been known at 8.00am. Such
a step only succeeds in confusing the exercise the more.
6.2.4 In rare cases where a tanker has completed loading from two tanks prior to 8.00am
and the same tanker is still receiving cargo from the third tank, then the total
shipments from the three tanks is regarded as export for the new month while the
opening gauge before pumping from the three tanks concerned are taken as the stock
at 8.00 am on the first day of the new month. However, for bill of lading purpose, the
date and time that loading is completed shall be documented on the bill of lading
document unless otherwise requested by the exporter and approved by the Director
of Petroleum Resources.
6.2.5 Calculation: The petroleum and petroleum product produced for any particular month
is calculated by a simple material balance equation.
6.2.6 Example
Production for January = Export (including local delivery) for January + Closing stock
for January – opening stock for January.
Export for January = Summation of exports between 8.00am on 1st of January to
8.00am on 1st of February.
6.2.7: - DETERMINATION OF PRODUCTION/TERMINAL ADJUSTMENT (ERRORS) Definition:
Terminal adjustment is referred to as volumes which represent the difference in
production obtained from material balance and that derived from production receipt
into terminal. Production/Terminal Adjustment (Errors) = Total Production
(Obtained by Material/Mass Balance) – Total Cumulative Production (Obtained by
Summation of Total Receipt into Terminal).
6.2.7.1: Terminal adjustment or losses should be determined and the report on Reconciled
Monthly Stock Inventory Production Mass Balance shall be signed -off jointly by the
operator, NNPC and DPR Representatives in the approved format shown below in
Appendix 1.
6.3 Procedure for Special Purpose Vessel Storage (SPV)
6.3.1 All such installations shall be adequately equipped with meters to measure receipts
into and off-takes from the vessel. Meter selection, sizing, installation, operation and
maintenance shall be in accordance with the procedure guide on dynamic
measurement contained in Part II of this document. Meter tickets shall be taken at
8.00am daily from the production meter bank and at the end of the batch pumping for
the off-taker meter bank.
6.3.2 Production in a particular month shall in this case be the sum of meter records over
the month while the stock shall be deduced from the total production and off-takes
during the month.
6.4 Procedure for Reporting and Allocating Crude Oil Loss/Theft Volume
6.4.1 All production/injection figures for both terminal operators and third party injectors
shall comply with the provisions of this procedure guide.