This standard specifies the definition of oil field crude oil loss, test parameters, measuring point locations, test instruments and requirements, selection of oil field gas samples, and test analysis methods and basic formulas. This standard is applicable to the determination of crude oil loss in oil fields. Warning: The application of this standard may involve hazardous substances, operations and equipment, but this standard does not address all safety issues related to their use. Users of this standard are responsible for establishing appropriate safety and health measures.