API STD 685-2011 PDF

Scope: This standard specifies the minimum requirements for sealless centrifugal pumps for use in petroleum@ heavy duty petrochemical and gas industry services. Refer to Annex A for application information. Notes following a clause are informative. This standard is applicable to single stage overhung pumps of two classifications@ Magnetic Drive Pumps (MDP) and Canned Motor Pumps (CMP). Sections 2 through 8 and Section 10 cover requirements applicable to both classifications. Section 9 is divided into two subsections and covers requirements unique to each classification. NOTE: Extension of applicability to other designs such as multistage will need additional input and agreement between Purchaser and Supplier. When application of sealless pumps is indicated@ relevant industry operating experience suggests sealless pumps produced to this Standard may be used for many applications and should be applied when conditions exceed any of the following: ?? Discharge pressure 1900 kPa (275 psig) ?? Suction pressure 500 kPa (75 psig) ?? Pumping temperature 150 ??(300 ?? ?? Rotative speed 3600 r/min ?? Rated total head 120 m (400 ft) ?? Impeller diameter 330 mm (13 in.) NOTE: For sealed pumps@ refer to ISO Standard 13709 (API 610).

API STD 685-2011 history

1970 API STD 685-2022
2011 API STD 685-2011 Sealless Centrifugal Pumps for Petroleum@ Petrochemical@ and Gas Industry Process Service (SECOND EDITION)
2000 API STD 685-2000 Sealless Centrifugal Pumps for Petroleum@ Heavy Duty Chemical@ and Gas Industry Services Downstream Segment