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

The ASME Section IV code specifically covers the rules and regulations for the construction of boilers and pressure vessels operating at low pressure. This section is particularly tailored for boilers, including low-pressure hot water supply boilers, ensuring that they are designed and constructed safely and effectively to manage the low-pressure systems they operate in.

ASME (American Society of Mechanical Engineers) establishes comprehensive standards that help ensure the safety and reliability of pressure-containing equipment, and Section IV is dedicated to the requirements pertinent to this type of boiler. It includes guidelines for materials, construction, installation, and maintenance that are recognized for ensuring safe operations within an established low-pressure framework.

Other codes, such as ASME Section VIII and CSA B51, have a different focus. ASME Section VIII pertains to pressure vessels for services beyond low pressure and CSA B51 relates to the Canadian Standards Association’s requirements for pressure vessels; neither is specifically intended for low-pressure hot water supply boilers. CSA B52, on the other hand, deals with mechanical refrigerating systems and heat pumps, which does not encompass the rules for low-pressure hot water supply boilers. Thus, ASME Section IV is the appropriate reference for this specific application.