API STD 685 For Petroleum Refining Standards

This standard covers the minimum requirements for sealless centrifugal pumps for use in petroleum, heavy duty chemical and gas industry services. Refer to Appendix U for application information.

Note: A bullet (•) at the beginning of a paragraph indicates that either a decision or further information is required. Further information should be shown on the datasheets (see Appendix B) or stated in the quotation request and purchase order.

Single stage pumps of two classifications, Magnetic Drive Pumps (MDP) and Canned Motor Pumps (CMP), are covered by this standard. Sections 2 through 8 and 10 cover requirements applicable to both classifications. Section 9 is divided into two subsections and covers requirements unique to each classification.