gas pipe bonding question

[Lectricbota]

If I have a poly gas line coming to a building where they then transition to a 1" stainless steel pipe for the last 3 feet or so coming out of the ground, does this pipe have to be bonded?

 

[Dennis Alwon]

The gas company does not want any bonding on the gas pipe on the line side of the meter. If this is the line side don't touch it. Since it is less then 10' in the ground then the gas line is technically not an electrode but the bonding of the gas line can be done thru the equipment that has a circuit run to it. Look at 250.104(B)

 

[RICK NAPIER]

Even if it was in contact with earth the gas line couldn't be an electrode.
250.52

(B) Not Permitted for Use as Grounding Electrodes.​

The following systems and materials shall not be used as grounding electrodes
(1) Metal underground gas piping systems​

(2) Aluminum

 

[petersonra]

Even if it was in contact with earth the gas line couldn't be an electrode.
250.52

(B) Not Permitted for Use as Grounding Electrodes.​

The following systems and materials shall not be used as grounding electrodes
(1) Metal underground gas piping systems​

(2) Aluminum

I have often wondered what difference it makes.

These days you have to bond the gas pipe to the GE system if CSST is used. How is that any different than using it as a GE?

 

[GoldDigger]

Well, only slightly tongue in cheek, in the first case you are bonding the pipe to all the other electrodes to protect the pipe while in the second case you are bonding to it to decrease the overall GES to earth impedance to protect other things. (But still not to provide a fault clearing path in either case, of course.)

Tapatalk!

 

[Dennis Alwon]

I have often wondered what difference it makes.

These days you have to bond the gas pipe to the GE system if CSST is used. How is that any different than using it as a GE?

Most gas meters have a dielectric fitting installed so that you cannot use it as a ge .

 

[Birken Vogt]

If gas pipe is metal it should be coated and/or taped to galvanically isolate it from all earth anyway. And, as stated, there should be a dielectric union at the point it leaves the ground so that there is no possibility of it being used as an unintentional grounding electrode. The bonding of the pipe inside the house is done to keep it at zero potential, and not to have the gas line become a grounding electrode of any kind. I suppose the short section of exposed (usually coated/insulated) metal between the dirt and the dielectric union just has to be overlooked.