ASA B16 22

a designation for a wrought copper and alloy pipe joint fitting used by the American National Standards Institute (ANSI)-an organization that recommends standards for many different products in various industries, formerly known as ASA (the American Standards Association). The assurance that the design and construction of a piping system will meet prescribed requirements is accomplished through the use of published codes and standards. Piping codes provide specific design criteria such as permissible materials of construction, which must be considered in design.