Can you use galvanized union for gas？

The use of galvanized joints on gas lines is generally not recommended and is often prohibited by building codes in many areas. Here’s why:

● Corrosion risk: Galvanized pipe fittings are coated with a layer of zinc to prevent rust. However, when used in natural gas pipelines, this zinc coating can corrode over time due to the presence of hydrogen sulfide and moisture in the gas, causing the zinc flakes to peel off. These flakes can clog gas regulators, valves and burners, creating potential safety hazards. It is not recommended to use galvanized pipe fittings to install gas systems.

● Building Codes: Many local building codes and standards, such as the National Gas Code (NFPA 54) in the United States, limit or outright prohibit the use of galvanized fittings in gas lines. Instead, they often specify black iron steel pipe and fittings, which are more resistant to the conditions found in gas piping systems.

● Alternative Materials: Black iron pipe and fittings are commonly used for natural gas and propane pipes because it does not have a zinc coating that can corrode and flake. Other acceptable materials may include corrugated stainless steel pipe (CSST) and certain types of polyethylene pipe for underground installations.

To ensure compliance with local codes and safety standards, always consult the applicable building codes in your area or consult a professional plumber or gas installer before installing or modifying gas lines. They can provide guidance on the proper materials and methods to use for gas piping in your specific location.

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