Dry pressure testing

[ShaunCorbs]

0.5 bar acceptable for gas?

A air rifle has legal limit of 12ft lbs, this is enough to kill small animals with a 1.77 pellet. Imagine what a 15mm speedfit cap could do at 3 bar or even higher.

On domestic you won't go over 0.20 on ng and it's the volume air rifle stores a small amount

 

[stevetheplumber]

weve air tested at 10 bar that way you can hear the leaks hep trep used to put 20 bar into a piece with two elbows and skip with it

 

[AWheating]

0.02 bar

 

[ShaunCorbs]

0.02 bar

or 2000 pascals

 

[Mgrant]

gas runs at 0.2mb so I suppose you would test this with a air with a dry testing kit to 0.3mb 1.5 x working pressure. As said I am doing my nvq level 3 to get my gas quals. I will stick to wet testing when testing c/h systems etc then.

 

[hammers4spanner]

From what i recall you need a licence if you test with air above a certain pressure.

 

[flat Eric]

A 15mm poly plumb end cap does about 20 feet at 3 bar, it wont kill you. As someone already said its to do with volume. A paintball gun ( spyder fenix ) needs 750psi to fire a 3 gram paintball to the legal limit of 300 feet per second where as a Eclipse Etha only uses 200psi. If you dont use enough air it wont show a leak, all CH circuits and gas pipes should hold 3 bar with ease so if they pop whats the point of a PRV set at 3 bar?

 

[AWheating]

0.2mb is a little low for a domestic gas supply

20ft is BS unless you had a very small volume of pipe work. Any gun paint or air uses a tiny volume of air/ gas. It's not the cap end that will do you harm anyway it's the small shard of metal from the failure. Some water mains I've worked on recently have been 8bar so I would need to air test and 12bar. Sounds stupid to me, buy a water test pump and keep safe.

And gas pipe work can only be tested to the regs.