Which code governs the construction of indirect vaporizers for LP-gas?

The correct choice is governed by the ASME Code, which stands for the American Society of Mechanical Engineers Code. This code specifically outlines the standards for the design, construction, inspection, and testing of pressure vessels and other equipment that holds or processes gases, including LP-gas (liquefied petroleum gas).

Indirect vaporizers are devices that convert liquid propane into gas without direct flame contact, and their construction is essential to safety and operational efficiency. The ASME Code ensures that these vaporizers are built to withstand the pressures and temperatures they will experience during operation, thereby minimizing the risk of failures or accidents.

The NFPA Code primarily addresses fire protection and safety measures, while ANSI Standards encompass consensus standards for various products and processes, but do not specifically focus on the construction of indirect vaporizers for LP-gas. ISO Specifications are international standards that may cover a broad range of topics, but they do not directly apply to the construction of equipment as specific as indirect vaporizers in the context of gas safety. Thus, the ASME Code is the most relevant and appropriate standard governing the construction of indirect vaporizers for LP-gas.