ABSTRACT
Centrifugal pumps are generally installed in identical pairs; one serving as the operating, the other one serving as the standby or spare pump. Compared to an API pump, the typical ANSI pump exhibits API pumps are simply pumps that comply with the safety and reliability-focused stipulations promulgated by American Petroleum Industry Standard 610. The reviewer will generally know the principal differences between ANSI pumps and API pumps: corrosion allowance, permissible nozzle loads, stuffing box dimensions, wear rings, foot mount vs. centerline mount, bearing housing seals, and bearing style, type and rating. However, the real depth of his technical know-how will show in the way he explains exceptions taken to API-610 or supplementary user's specifications. When purchased in the 1970's, each of these pumps complied with API Standard 610 and supplementary specifications then issued by the engineering offices of many contractors or major petrochemical companies.
