This standard covers the minimum requirements for centrifugal pumps, including pumps running in reverse as hydraulic power recovery turbines, for use in petroleum, heavy-duty chemical, and gas industry services.This standard is based on die accumulated knowledge and experience of manufacturers and users of centrifugal pumps. The objective of this standard is to provide a purchase specification to facilitate the manufacture and procurement of centrifugal pumps for use in petroleum, chemical, and gas industry services.