The API Committee on Petroleum Measurement (COPM) provides leadership in developing and maintaining cost effective, state of the art, hydrocarbon measurement standards and programs based on sound technical principles consistent with current measurement technology, recognized business accounting and engineering practices, and industry consensus. This is accomplished through the committee's and API’s leadership role in the national and international standardization community in the development, publication, promotion, and revision of petroleum measurement standards, through its subcommittee structure, and through elimination of duplicative efforts. The committee is supported by API's Standards and Training Group, whose mission is to meet the needs of API and the oil and natural gas industry by producing internationally-acceptable petroleum standards and training programs on a self-supporting basis. Below is a list of the subcommittees and the areas they work with.
- The Subcommittee on Evaporation Loss Estimation (CELE) develops, approves, and maintains publications that provide methods for determining evaporation losses and emissions during storage and transfer of crude petroleum and petroleum products, MPMS Chapter 19.
- Calculation of Petroleum Quantities for NGL, MPMS Chapter 12
- Natural Gas Fluids Measurement, MPMS Chapter 14
- Allocation Measurement, MPMS Chapter 20
- Electronic Gas Measurement, MPMS Chapter 21.1
- Tank Calibration, MPMS Chapter 2
- Tank Gauging, MPMS Chapter 3
- Proving Systems, MPMS Chapter 4
- Metering, MPMS Chapter 5
- Metering Assemblies, MPMS Chapter 6
- Calculation of Petroleum Quantities, MPMS Chapter 12
- Statistical Aspects of Measuring and Sampling, MPMS Chapter13
- Measurement by Weight, MPMS Chapter 16
- Crude by Truck, MPMS Chapter 18
- Allocation, MPMS Chapter 20.1 (Joint with COGFM)
- Flow Measurement- Electronic Liquid Measurement, MPMS Chapter 21.2
- Marine Measurement, MPMS, Chapter 17
- Measurement Accountability
- Loss Control of Petroleum and Petroleum Products Involving all Modes of Transportation
- Temperature Determination, MPMS Chapter 7
- Sampling, MPMS Chapter 8
- Density Determination, MPMS Chapter 9
- Sediment & Water Determination, MPMS Chapter 10
- Physical Properties, MPMS Chapter 11
- Statistics, MPMS Chapter 13
- Use of SI Units, MPMS Chapter 15
- Develops, approves, and maintains standards for production and allocation measurement, MPMS Chapter 20
- The Subcommittee on Measurement Education & Training develops training programs based on current API measurement Standards.