This guideline identifies the maintenance checks to be performed on a turbine meter that has been removed from service.
TURBINE METER AND POSITIVE DISPLACEMENT METER
Procedure When any maintenance or inspection is performed, the meter shall be
proved immediately upon being returned to service and a new curve shall
be generated.
Repair or replace components not in accordance with manufacturer’s recommendations. Completely dissemble the meter while making the following checks:
1. All meter clearances, rotor run out measurements, diffuser ring measurements, bearing and cone measurements shall be determined and recorded on designated forms when initially purchased, prior to being sent to factory for repair and on return from factory after repair.
2. Inspect blade weld connections to rim, rim surfaces and buttons,
blade surfaces and blade angles for damage.
3. Blade surfaces should be sharp and smooth.
4. Check for the effects of erosion, corrosion and electrolytic action.
5. Inspect bearings, shaft, hub and journals for signs of rubbing or poor lubrication.
6. Inspect straightening vanes to ensure all tubes are clean, straight and free of obstructions.
POSITIVE DISPLACEMENT METER INSPECTION
This guideline identifies the maintenance checks to be performed on a PD meter that has been removed from service.
Procedure Rotor assembly should be dipped or steam-cleaned prior to disassembly.
When any maintenance or inspection is performed, the meter shall be
proved immediately upon being returned to service and a new curve shall
be generated.
When the inner mechanism assembly of a double-case PD meter is removed from service, tag the assembly with the serial number of the meter from which it was removed, and fill out a Meter Inspection Report. Include in the remarks the date the rotor was removed and the date the rotor was repaired and ready for service.
Completely disassemble the meter while making the following checks:
1. Gauge all clearances and caliper all parts subject to wear.
2. Inspect all bearings, rollers and bushings.
3. Inspect packing gland and check torque load.
4. Check for the effects of erosion, corrosion and electrolytic action.
5. Check all gearing in the counter.
6. Inspect the compensator for wear and general condition.
7. Inspect the temperature correction bulb and bellows assembly and the
ambient temperature correction bellows.
8. Inspect all meter accessories including counter, transmitters, angle take-off, etc.
9. Inspect other associated equipment such as air eliminators, strainers, samplers, automatic controls and fail-safe devices.