Station · Pipelines
Custody Meter
The metering skid where ownership of the oil or product changes hands, so the volume must be measured to a high accuracy.
What it does
Measures volume or mass with temperature and pressure correction, and is proved regularly against a known volume. The reading is the basis for payment between shipper and carrier.
Basics
| Meters | Coriolis or turbine |
| Corrections | Temperature and pressure |
| Checked by | Regular proving |
| Also | Air eliminator ahead of the meter |
Common failures
- Meter drift that goes unnoticed between provings
Troubleshooting
- Symptom
- Meter factor changes a lot between provings
- Likely cause
- Wear, installation effects, changed fluid or air in the line
- What to check
- Check the air eliminator, inspect the meter and prove again