When to use continuity bonding

[Paul 1978]

Hi,
I know when applying flame to a fitting you remove the gas meter and fit bonding upstream and downstream, and if cutting into a gas pipe you use bonding either side of break. Do you use it if replacing and isolation valve?

 

[ShaunCorbs]

On water you mean ?

 

[Old Account]

Hi,
I know when applying flame to a fitting you remove the gas meter and fit bonding upstream and downstream, and if cutting into a gas pipe you use bonding either side of break. Do you use it if replacing and isolation valve?

As far as I know yes, because you break into a pipe supply

 

[johnduffell]

The long answer is technically all bonding should be close to the point the metallic part whether it be a pipe or whatever enters into the house.
If you break into the pipe before that point, even when there is not an existing broken neutral in the supply network you could be breaking a decent current if the phases are not in balance. Factor in a broken neutral and in a totally extreme case the bonding could be the return path in place of the neutral.
Gas is particularly sensitive to sparking when a pipe is pulled apart for obvious reasons. But in any case you are removing the protective bonding, so if the water was the only bond and you cut into it you could leave yourself with a decent voltage across the two separated parts.

 

[hammers4spanner]

The only time I ever use it is when I am on a gas safe inspection