Which american institute standard does piping engineer refer?

ASME for Power Piping

The American Petroleum institute (API)The American Iron & Steel institute (AISI) The American Society for Testing and materials (ASTM) The American National standard institute (AISI)The American welding society (AWS)The American Water Works Association (AWWA). The American Society for Mechanical Engineers (ASME)

 i support Mr Basharat  and i add only more referances,American National Standards Institute, Inc. (ANSI) & United States Bureau of Reclamation

Engineering and Research Center Code922 (USBR) & American Concrete Institute (ASI)

In my opinion the American Petroleum institute (API).American society of Mechanical Engineers (ASME).

American society of  Mechanical Engineers (ASME)