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

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1.3.4 The date of in-factory test and calibrations of the meters and the prover shall be
notified to the Director of petroleum Resources one month ahead while the date of all
subsequent calibrations and proving of the meters and prover shall be notified to the
Department of Petroleum Resources two weeks ahead of time.
1.3.5 A representative of the Department of Petroleum Resources shall be present to
witness all tests and calibrations of meters and prover in satisfaction of the specific
provisions of the Petroleum (Drilling and Production) Regulation 52 (3) of 1969.
1.3.6 The allowable metering devices shall be of the same type for all the meters in a bank
and for the meters at interfaces along the same pipeline.
1.3.7 No by-pass of the meter bank or provision for reverse flow through the bank shall be
allowed for any system. For existing installations, all by-pass shall be suitably blanked
off at the inception of this guide.
1.3.8 A file shall be maintained for each meter which will contain all information relevant to
the design and maintenance of the meter throughout its operational life.
1.3.9 It shall be mandatory that no PD meter in a bank shall be operated at more than 80%
of its maximum name plate capacity. Consequently, the number of meters required for
a given service shall be obtained from the following empirical relationship, rounded-
off to the next whole number:
No. of Meters =
𝑀𝑒𝑡𝑒𝑟 𝑠𝑡𝑎𝑡𝑖𝑜𝑛′𝑠 𝐹𝑙𝑜𝑤𝑟𝑎𝑡𝑒
0.80∗𝑀𝑎𝑥𝑖𝑚𝑢𝑚 𝐶𝑎𝑝𝑎𝑐𝑖𝑡𝑦 𝑜𝑓 𝑒𝑎𝑐ℎ 𝑚𝑒𝑡𝑒𝑟
1.3.10 An extra meter shall be provided in each bank, as back-up, to allow for uninterrupted
operations.
1.3.11 Control procedure shall be worked out for the witnessing and approval by the
Department of Petroleum Resources of the metering system, and its functional
acceptance test before leaving the factory and on the completion of installation on
site before commissioning. This shall follow the lodgment of construction and
installation Program with the Department of Petroleum Resources.
1.3.12 Accessory equipment which may include filters, temperature, pressure gauges and
transmitters as well as protective valves shall be installed as indicated in the
Department of Petroleum Resources approved Detailed Engineering Design (DED).
1.3.13 During meter selection, the meter linearity, accuracy and turn-down ratio of the meter
shall be considered.
1.3.14 The linearity of a custody transfer flow meter shall be ±0.15% or lower. Meters shall be
operated and proved within this linearity limit.
1.3.15 The LACT system must be located within a clear visibility range to the injection point.
1.3.16 This point shall be agreed by both parties and approved by DPR.