scope:

1 Scope

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.

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.

For process services not exceeding any of the limits below, purchasers may wish to consider pumps that do not comply with API Standard 685.