MASTER METER PROVER TROUBLESHOOTING FOR OPERATIONS

Scope
This guideline identifies the methods to be used for troubleshooting
proving operations using the master meter prover.

Frequency As indicated below
Procedure

Problem	Location & Probable Cause	Test/Inspection	Corrective Action
Poor Repeatability	—– Master Meter Prover —–
	Cavitation	Apply excessive backpressure for a brief period	Adjust back-pressure to appropriate level.
	Pulse generator fault	At uniform flow rate check that pulse frequency is constant.	Repair or replace as required
	Electrical noise	Check for random electrical interference.	Trace and eliminate interference.
	Entrapped air or gas and/or cavitation	Open vents slowly, then close.	Locate air or gas source and eliminate.
	Worn meter parts	Dismantle and inspect.	Reassemble with new parts as required and reprove master meter.
	Leaking valves	Check for full open or close position and leak tightness.	Repair or replace as required.
	—– Field Meter —–
	Cavitation	Apply excessive backpressure for a brief period	Adjust back-pressure to appropriate level.
	Pulse generator fault	At uniform flow rate check that pulse frequency is constant.	Repair or replace as required
	Temperature variation	Measure temperature often and accurately.	Correct for temperature effects on field meter and master meter.
	Warn meter parts	Dismantle and inspect.	Reassemble with new parts as required and reprove master meter.
	Turbine meter straightening section	Remove and inspect for damage.	Repair or replace as required.
	Pressure variation	Check gauges.	a) Look for cavitation. b) Check back-pressure valves.
	Temperature variation.	Check temperature sensors.	Maintain stable flow condition.

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