SMALL VOLUME PROVER TROUBLESHOOTING FOR OPERATIONS
| Problem | Location & Probable Cause | Test/Inspection | Corrective Action |
| Poor Repeatability | —– Small Volume Prover —– | ||
| Detector(s) | Check detectors for proper operation. |
a) Shield optical switches from ambient light.b) Replace detectors, if faulty.
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| Electronics, pulse | Check per instructions in API MPMS Chapter 4, Section 6. |
Adjust, Repair, or replace as required. |
|
| Improper plenum pressure |
Verify plenum pressure per manufacturer’s specifications. |
Adjust as required. | |
| —– Field Meter —–
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| Meter bearing wear | a) Dismantle and inspect.
b) Analyze pulse train with |
Repair or replace as required. |
|
| Damaged PD or turbine meter rotor |
a) Dismantle and inspect.
b) Analyze pulse train with |
Repair or replace as required. |
|
| Decrease in meter registration, meter factor increases |
Prover temperature too low. |
Stabilize temperature. | |
| Meter | Replace bearings or replace meter. |
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| Increase in meter registration, meter factor decreases |
Prover temperature too high. |
Check thermometer. | |
| Fluid viscosity increase |
Stabilize viscosity. | ||
| Decrease in meter registration, meter factor decreases |
Build-up on prover pipe wall. |
Clean prover. | |
| Increase or decrease in meter registration, meter factor increases or decreases |
Meter calibrator. | Lubricate or replace calibrator. |
|
| Severe change in meter factor |
Malfunction in ATC assembly. |
Perform hot and cold test. |
|
| Severe decrease in meter factor |
Collapsed bulb and bellows. |
Replace bulb and bellows. |
|
| Displacer undersized. | Resize or replace displacer |
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| Sever increase in meter factor |
a) Malfunction of calibrator |
Repair or replace as required. |
|
| b) Inner mechanical problem |
b) Inner mechanical problem |
PROVING METERING SYSTEMS | PROCESS & CONTROL SYSTEM
Shop Inspection and Testing of Reciprocating Compressors
EQUIPMENT CALIBRATION METHODS | PROCESS & CONTROL SYSTEMS
Custody Transfer Meters – Liquids