Components
Custody transfer requires an entire metering system that is designed and engineered for the application, not just flowmeters. Components of a custody transfer system typically include:
- Multiple meters/meter runs;
- Flow computers;
- Quality systems (gas chromatographs to measure energy content of natural gas and sampling systems for liquid);
- Calibration using in-place or mobile provers for liquid, or master-meter for liquid or gas; and
- Supporting automation.
A typical liquid custody transfer skid includes multiple flowmeters and meter provers. Provers are used to calibrate meters in-situ and are performed frequently; typically before, during, and after a batch transfer for metering assurance.
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