== Role in settings specifications == 

 This needs more work. API sets standards in several different areas of the industry, including drilling and production equipment, refining, lubricants, offshore engineering and construction. There is a spec for centrifugal pumps in refinery and flowline service, but the standard centrifugal pumps used on drilling rigs are not controlled by API (although they may be surrounded by other drilling equipment that is governed by an API spec).