Indirect vaporizers must be constructed according to the applicable provisions of which code for a design pressure of 250 psig?

Indirect vaporizers designed for a design pressure of 250 psig must be constructed in accordance with the ASME Code. This code is established by the American Society of Mechanical Engineers and contains rigorous standards for the design, fabrication, inspection, and testing of pressure vessels and related components. Compliance with the ASME Code ensures that these systems can safely handle high pressures and adhere to industry best practices, which are essential for maintaining safety and functionality in propane gas applications. The ASME Code provides the necessary guidelines to prevent failures and hazards that could arise from improper construction or design of pressure vessels.

Other codes mentioned, such as the NFPA Code, focus on fire prevention and safety protocols rather than the specifics of pressure vessel construction. ISO Standards are international guidelines that set general requirements, while ANSI Guidelines primarily cover consensus standards but may not have the same specific depth that the ASME Code provides for high-pressure systems. Therefore, for the construction of indirect vaporizers at such specific design pressures, the ASME Code is the appropriate reference.