Which organization is known for setting codes and standards for plumbing related to mechanical systems?

The organization primarily recognized for establishing codes and standards specifically for plumbing as it pertains to mechanical systems is the American Society of Mechanical Engineers (ASME). ASME plays a critical role in the development of standards that ensure safety, reliability, and efficiency in various mechanical applications, including plumbing systems.

ASME’s contributions include the creation of the ASME A112 series of standards, which covers plumbing system components such as fittings, fixtures, and materials, making them crucial for the plumbing industry's integrity and operational standards. Their guidelines also encompass various other mechanical engineering aspects, ensuring a comprehensive understanding and regulation.

While ANSI oversees the establishment of standards across a wide spectrum of industries, and ASTM focuses more on material testing and specifications, ASME explicitly addresses the mechanical engineering components related to plumbing systems. NSF, on the other hand, is mainly involved with public health and safety standards concerning water quality and sanitation but does not specifically address mechanical systems in the same context as ASME.