What is typically used to ensure that piping does not promote galvanic action?

The use of approved materials is essential in plumbing systems to prevent galvanic action, which occurs when two dissimilar metals come into contact in the presence of an electrolyte, leading to corrosion. By utilizing materials that are compatible with each other, and specifically engineered to minimize the risk of galvanic corrosion, the integrity and longevity of the piping system are preserved.

When materials are approved, they generally meet industry standards, which consider factors like corrosion resistance and material compatibility. This ensures that the components will perform well together in a plumbing system, reducing the potential for electrical currents (which can cause galvanic action) to develop.

In contrast, sealing tape, bearing grease, and insulation have specific purposes in plumbing but do not directly address the issue of galvanic action. Sealing tape is typically used for sealing pipe threads to prevent leaks, bearing grease is meant for lubrication, and insulation is commonly used for thermal protection. While insulation can help reduce moisture and condensation, it does not inherently prevent galvanic action between metals. Hence, the choice of approved materials stands out as the most effective means to mitigate galvanic problems in piping systems.