Custody transfer is the point where gas ownership or value is determined using measured quantity and quality.
Why the standard is higher
Because money and contractual performance depend on the result, the measurement system must be accurate, traceable, maintained, and defensible.
What forms the chain
The chain usually includes flow measurement, pressure and temperature inputs, gas composition, property calculation, and reporting logic.
Why uncertainty matters
Small biases can have large commercial impact over time. Good custody transfer systems focus on systematic measurement quality, not only day-to-day operability.
Why this matters beyond metering specialists
Many analyser and chromatograph decisions influence custody transfer quality even when they are made outside the metering team.
