New York Low Pressure Boiler COF Practice

What is used when connecting two different types of metallic pipe?

1. Coupling

2. Dielectric kit or fitting

3. Sealant

4. Tape

The correct answer is: Dielectric kit or fitting

When connecting two different types of metallic pipes, a dielectric kit or fitting is used to prevent galvanic corrosion that can occur when dissimilar metals are in contact with each other. Galvanic corrosion happens because one metal can act as anode (corroding faster), while the other acts as a cathode. The dielectric fitting creates a non-conductive barrier between the two metals, effectively isolating them from electrical contact, which helps to extend the lifespan of the piping system and prevents leaks and failures that could arise from corrosion. In contrast, while a coupling is a common fitting used to connect two pieces of the same type of pipe, it does not provide the necessary protection against galvanic corrosion. Sealant and tape are typically used for sealing threads and joints but do not address the specific issue of connecting dissimilar metals. Thus, using a dielectric fitting is the appropriate solution for ensuring safety and longevity in such configurations.