Which code contains rules for the construction of low-pressure hot water supply boilers?

The rules for the construction of low-pressure hot water supply boilers are contained in ASME Section IV. This section specifically focuses on the design and construction of boilers and pressure vessels, including various types of low-pressure systems.

ASME Section IV outlines the requirements regarding materials, construction practices, testing, and maintenance of boilers that operate under low-pressure conditions, making it the relevant standard for hot water supply boilers. This ensures that equipment is safe, reliable, and efficiently operates within the designated parameters.

Other standards mentioned, such as ASME Section VIII, focus on pressure vessels for higher pressure systems, while CSA B51 pertains to boiler, pressure vessel, and pressure piping codes applicable in Canada, but does not specifically cover low-pressure hot water supply boilers to the same extent as ASME Section IV. CSA B52 deals with mechanical refrigeration, which is not applicable in this context. Therefore, ASME Section IV is the correct reference for the construction rules of low-pressure hot water supply boilers.