Technical metering systems, in complying with the requirements as laid down in the American Petroleum Institute (API)Measurement Standards. The major components of a
Technical Audit are;
1.An evaluation of the condition and design of each metering system with regards to Electronic Condition as per API Standard.

2. Verification of throughout, calculations for Gross Measured
3. Volume Standard Volume Validation of any other Computer
   Constants and or functions.
4. Calibration checks on Temperature and Pressure
   Instrumentation.
   4.Check on-line sample analysis Procedures and function
   test autosampler.
5. Establishing flow curves for meters over the flow range for
   linearity andrepeatability.
   6.Verification of Proving calculation and examination of
   current prover loop calibration Certificate, checking current
   base volume is in use and correct defect switch pair is
   selected.Examinationof internal conditionofProver.
6. Prove that all critical valves in system are bubble tight when
   closed under normal operating condition; function check
   associatedleak detector system.
   Calibration of instrumentation can also be conducted in the
   course of the exercise to reduce errors and improve overall
   measurementuncertainty.