ACD is an engineering and manufacturing company specializing in machinery designed to operate at cryogenic temperatures as lo ... w as – 420 degrees Fahrenheit, the boiling point of Liquid hydrogen. For over 50 years, ACD has specialized in centrifugal and reciprocating pumps as well as turbines for air separation. ACD has the most diversified product line in the industry covering nearly every application requiring pumps or turboexpanders. read more