ACD (also known as Nikkiso ACD) is a manufacturer of reciprocating and centrifugal pumps for all cryogenic liquids and turboexpanders for air separation. It specializes in the design, custom engineered solutions, sales and after-market service of cryogenic machinery including centrifugal pumps, reciprocating pumps, LNG systems, cryogenic and gas processing equipment, and engineered solutions and service. The company serves drilling and energy companies, aerospace companies, materials research, industrial gas facilities, steel plants, etc.