API 610 Centrifugal Pump Standard
The API 610 is an extremely strict and common standard for centrifugal pumps. ANSI pumps are pumps that we commonly use to fix client problems. ANSI pumps can be compared to end-suction pumps that are manufactured according to the API 610 standard. API 610 can be applied to many different types of centrifugal pumps and other API 610 compliant machines, such as: overhung (OH) pumps, between bearing (BB) pumps, and vertical suspended (VS) pumps.
API 685 Sealless Centrifugal Pump Standard
API 685 entails the minimum requirements for sealless centrifugal pumps manufactured for the heavy duty petrochemical and gas industry services. API 685 is very similar to API 610, just the sealless pump equivalent. Unlike the various types of pumps that API 610 can be applied to, API 685 is applied to only two different classifications of overhung (OH) pumps: magnetic drive pumps and canned motor pumps. That is considered to be the industry standard for sealless pumps and has been for many years.