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LACT Unit & Crude Custody Transfer Measurement Checklist
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Verify metering accuracy, proving, sampling, and calculation practices for a Lease Automatic Custody Transfer (LACT) unit measuring crude oil for sale and royalty accounting.
API MPMS Ch. 6.1API MPMS Ch. 12API MPMS Ch. 4/530 CFR 1202
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Metering & Proving
- Is the custody transfer meter proved at the required frequency against a certified prover? *
- Do the latest proving runs meet the required repeatability and meter-factor tolerance? *
- Record the current meter factor from the latest proving report. *
- Are prover and master-meter calibration certificates current and traceable? *
Sampling & Quality Determination
- Is an automatic sampler collecting a representative composite sample proportional to flow? *
- Is the sediment and water (S&W / BS&W) content determined and applied to net volume calculations? *
- Are the sampler grab rate and sample-loop mixing verified to ensure representative sampling? *
- Is the BS&W monitor calibrated and set to divert or alarm off-spec crude above the sales limit? *
Temperature, Pressure & Volume Correction
- Are temperature and pressure at the meter recorded for correction to standard conditions? *
- Is API gravity determined and used with correct correction factors in the net standard volume calculation? *
- Are volume calculations performed and rounded per API MPMS Chapter 12 procedures? *
Ticketing, Seals & Records
- Are custody transfer (run) tickets generated with opening/closing meter readings, meter factor, and quality data? *
- Are meter, prover connections, and sampler seals intact with a documented seal log? *
- Are measurement records retained to support royalty reporting and audit requirements? *
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