What should be placed between different joints and piping materials?

The inclusion of an approved adapter fitting between different joints and piping materials is essential in ensuring a proper connection that can handle the specific pressures and temperatures involved in high-pressure boiler systems.

Adapter fittings are designed to convert or connect two different types or sizes of piping materials, thus allowing for compatibility and integrity in the overall piping system. They help in preventing leaks and failures that might occur if incompatible materials are directly joined without proper fittings designed for that purpose.

Using an approved adapter fitting also ensures compliance with safety and regulatory standards, which is critical in high-pressure environments. This adherence to regulations reduces the risk of accidents or malfunctions, as the connection will be secure and able to withstand the operational conditions of the boiler system.

In contrast, other methods like clamps may provide temporary solutions but do not typically ensure the required structural integrity or compliance with high-pressure conditions. Sealing tapes, while useful for minor leak prevention, are not sufficient for providing a strong mechanical connection between different piping materials. Temporary plugs serve a different purpose as they are used to close off openings and are not suitable for making permanent connections.