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

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1.15.15 Field Meter validation
The following verification procedure shall be carried out on quarterly basis and witnessed
by DPR. It includes but not limited to the following:
1. Zero-flow verification test shall be carried out as follows;
• If zero-flow verification is performed at elevated pressure, blind flanges shall
be attached to the ends of the flow meter body.
• The acoustic properties of the reference gas shall be well known and
documented.
• The gas pressure and temperature shall be allowed to stabilize at the outset
of the test.
• The gas velocities for each acoustic path shall be recorded for at least 30
seconds. The mean gas velocity and standard deviation for each acoustic path
shall then be calculated.
• Adjustments to the meter shall be made as necessary to bring the meter
performance into compliance with the specifications stated in this guideline.
• The measured speed-of-sound values shall be compared with the theoretical
value computed using a complete compositional analysis of the reference gas
• The zero-flow verification test shall meet the following:
a. The individual path gas velocity no greater than ±0.02 ft/sec (0.006 m/s)
b. The speed of sound per path within ±0.2% of the theoretical value
c. Percentage of accepted pulses for each acoustic path are 100%
d. All gain levels are within the nominal limits provided by the manufacturer
e. Maximum Speed of Sound path spread not greater than 1 .5 ft/s (0.5 m/s)
2. Speed of sound measurement analysis
3. Individual path measurement analysis
4. Internal inspection
5. Dimensional verification
6. Other mechanical and electrical tests
During the validation if the meter did not pass Zero check and verification of sound, the
meter should be taken out for service.

1.15.16 Pre-commissioning checklist
A
HEADER
DETAILS
STATUS
1
Company name

2
Date of Inspection

3
Name of Inspector(s)

B
GENERAL INFORMATION

1
Serial number

2
Nominal Pipe diameter

3
Fluid
measured
(gas/liquid)

4
Meter type

C
METER TUBE

1
Flow
conditioner
(Yes/No)

2
Type of flow conditioner

3
How
fastened?
(welded/flanged/pinned)