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Ground joint unions are used to make new connections to threaded gas piping systems (tapping into an existing gas line).

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Guido Larkin

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3y ago

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What is a ground-joint union for gas lines?

Ground joint unions are used to make new connections to threaded gas piping systems (tapping into an existing gas line).


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Yes. But, only if the union is after a main shut off valve and is before and appliance connection. ex. A ball valve then pipe and a union before an furnace connection. Unions used as couplings to lengthen pipe are not code approved.


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Gas lines typically appear as thin, metallic pipes that can be either black iron, copper, or flexible plastic tubing, depending on the installation and local codes. They may be installed above ground or buried underground, often running from a gas meter to various appliances. The lines are usually connected with fittings and valves, and they may be marked with warning signs indicating the presence of gas. In residential settings, gas lines are usually painted yellow for visibility and safety.


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when a quake happens in urban areas gas lines may burst turning into flames


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