Underground metallic piping requires the use of an ______ fitting before the piping enters the building

Underground metallic piping requires the use of an ______ fitting before the piping enters the building

• A. Insulating (Dielectric)
• B. Compression
• C. Flare
• D. Solder

Answer: (A)

Electrical isolation at the entry point is needed to prevent galvanic corrosion and stray electrical currents from damaging the gas piping as it goes from underground into the building. An insulating (dielectric) fitting electrically separates the underground metallic pipe from the portion inside the building, stopping the flow of electrical current that can cause rapid corrosion when different metals or moisture in soil are involved. The other joint types—compression, flare, or solder—are methods of joining pipe, but they do not provide this necessary electrical isolation at the point where the pipe enters the building, so they won’t prevent the corrosion or grounding issues that dielectric fittings address.

Electrical isolation at the entry point is needed to prevent galvanic corrosion and stray electrical currents from damaging the gas piping as it goes from underground into the building. An insulating (dielectric) fitting electrically separates the underground metallic pipe from the portion inside the building, stopping the flow of electrical current that can cause rapid corrosion when different metals or moisture in soil are involved. The other joint types—compression, flare, or solder—are methods of joining pipe, but they do not provide this necessary electrical isolation at the point where the pipe enters the building, so they won’t prevent the corrosion or grounding issues that dielectric fittings address.