pressure testing

[soother223]

what pressure an how long should i dry test my JG circuits for?

 

[muggles]

However you like, you won't be following manufacturers procedures with a dry test anyway. I'd say 1.5 × max working pressure for an hour if you must do it that way. John Guest recommend a wet test of 2 bar for 10 minutes followed by 10 bar for 10 minutes. You'll do well to find a compressor that will pump up to 10 bar

 

[Onetap]

You'll do well to find a compressor that will pump up to 10 bar

Only an idiot tests with air. If you've bought one of those Monument dry test kits sold for the use of incompetent simpletons, then I'd suggest you take it back and ask for your money back; it is unfit for the purpose for which it was sold.

The instructions don't specify pressure or duration because it's ****ing dangerous.

 

[muggles]

You'll do well to find a compressor that will pump up to 10 bar

Only an idiot tests with air. If you've bought one of those Monument dry test kits sold for the use of incompetent simpletons, then I'd suggest you take it back and ask for your money back; it is unfit for the purpose for which it was sold.

The instructions don't specify pressure or duration because it's f***** dangerous.

I haven't bought one, I was simply making the point that it can't be done...suppose I maybe should have explained why it's more dangerous than testing with water at the same time, but I didn't, because I don't know why Maybe you could do that...

 

[dextrous]

You'll do well to find a compressor that will pump up to 10 bar

Only an idiot tests with air. If you've bought one of those Monument dry test kits sold for the use of incompetent simpletons, then I'd suggest you take it back and ask for your money back; it is unfit for the purpose for which it was sold.

The instructions don't specify pressure or duration because it's f***** dangerous.

Out of interest, why is the airtester unfit for purpose, and why is it more dangerous than hydraulic testing?

 

[transam]

Whats a jg circuit ? air at very high pressures if it fractures a pipe & suddenly releases is un-safe , when they test large ind , gas mains they are only allowed to test up to a certain pressure with air , there after thay have to use water & hydrulically test the pipe , & the water has to be tankered in & out ! ever seen a car tyre over pressurised & burst I did bloke ended up in casualty !!

 

[DP]

Because it is same as an airgun. If something comes off, it will take you head off.

 

[dextrous]

But why is, for example, a hydraulic "explosion" at say 3 bar safer than a pneumatic one at the same pressure? After all, 3 bar would be a reasonable test for a heating circuit?

 

[ManxPlumber]

what pressure an how long should i dry test my JG circuits for?

JG?

If you mean gas then you would already know if you were registered as competent, if you are neither then no RGI should be telling you

 

[dextrous]

what pressure an how long should i dry test my JG circuits for?

JG?

If you mean gas then you would already know if you were registered as competent, if you are neither then no RGI should be telling you

Think the op is referring to JG (John Guest) placcy pipes for water purposes (possibly undefloor heating?)

 

[soother223]

thanks guys! i had heard some stories about testing with air so just wanted to check it out...

 

[ManxPlumber]

There's two tests as set by the water regs:

Test A.
1.5 times max working pressure for 30 mins, test continues for further 90 mins without further pressurising; pressure then reduced to a third of test pressure after 30 mins; pressure does not drop below one third of test pressure over following 90 mins; no visible leaks throughout test

Test B.
1.5 times max working pressure for 30 mins, then note pressure, test continues for 150 mins without further pressurising; drop in pressure must be less than 0.6 bar (60kPa) after the following 30 mins, or 0.8 bar (80kPa) after the following 150 mins; no visible leaks throughout test