Dielectric union in gas line

[Galt]

This is in regards to LP gas , all the local suppliers are isolating the underground copper gas lines with a union. Isn't this a lightning hazard?

 

[mopowr steve]

This is in regards to LP gas , all the local suppliers are isolating the underground copper gas lines with a union. Isn't this a lightning hazard?

I would think so! By the way just because it's a union doesn't mean that it is a dielectric union.
Although they may have done it because of some instances where service personal were getting shocked from tank/underground copper lines due to faulty grounding/ open neutral. Which should have been corrected instead they tried to isolate there gas lines/tanks.

 

[don_resqcapt19]

The code says that the gas piping in the building must be bonded. The code says that underground gas piping can't be a grounding electrode. If there is no dielectric union the under ground pipe becomes a grounding electrode.

All of the natural gas lines in this area had dielectric unions on the street side of the meter...now they just use non-metallic piping from the street main to the building so there is no need for that now.

 

[Galt]

What happens if lightning hits a tree in the yard close to the tank or the underground line? I have repaired a lot of lightning damage over the years it seems to me it does the most damage when it has to jump a gap of some sort. Can a dielectric union take this without failing?

 

[don_resqcapt19]

What happens if lightning hits a tree in the yard close to the tank or the underground line? I have repaired a lot of lightning damage over the years it seems to me it does the most damage when it has to jump a gap of some sort. Can a dielectric union take this without failing?

Lightning jumps miles...it will have no problem jumping the dielectric union. There would likely be damage at the union.