flanagaj Posted March 9 Posted March 9 I installed a temporary building supply which is due to be connected in a couple of weeks time. The trench inspection was done a month back and signed off, and I was going to back fill the trench yesterday. But when I connected my manometer and pressured the system to 4 bar, it wasn't holding pressure and very slowly decreased. The double check valve was a brass one with female threads and I used PTFE. I am yet to locate the location of the air leak, but wanted to ask whether an external tap when closed should hole air pressure? Also, is there a better option than PTFE tape. I know some people swear by the Loctite offering?
JohnMo Posted March 9 Posted March 9 Use soapy water on all joints, if you have an air leak it will bubble up. I started to use loctite 55 cord stuff. 1
flanagaj Posted March 9 Author Posted March 9 5 minutes ago, JohnMo said: Use soapy water on all joints, if you have an air leak it will bubble up. I started to use loctite 55 cord stuff. Rookie error, but I should have pressure tested it, before putting it in the ground and putting the piece of soil pipe over the vertical part. Still, it won't take long to whip it out and find out where the leak is.
Russell griffiths Posted March 9 Posted March 9 Where have you got any joins that could leak underground, you shouldn’t have any joins untill you hit the first fitting on your vertical timber holding all the gubbins and the tap. out of all the joints I can think you would have on that vertical timber the only one that would have ptfe on would be the tap into the backing plate. 1
Nickfromwales Posted March 9 Posted March 9 6 hours ago, flanagaj said: wanted to ask whether an external tap when closed should hole air pressure? Yup. 100% solid. Are there joints underground? Or a single pipe run? This stuff is crazy hardy, so I’d be shocked if you’ve managed to damage to pipe. Are you testing wet or dry? Best to just connect it to the mains and let the leak show itself. 2
Marvin Posted March 9 Posted March 9 3 minutes ago, Nickfromwales said: Yup. 100% solid. Are there joints underground? Or a single pipe run? This stuff is crazy hardy, so I’d be shocked if you’ve managed to damage to pipe. Are you testing wet or dry? Best to just connect it to the mains and let the leak show itself. Yup. You'll know for sure doing this...
Nickfromwales Posted March 9 Posted March 9 15 hours ago, Marvin said: Yup. You'll know for sure doing this... Yup. Whenever we test a whole of house plumbing system in front of clients I shout “OK……switch on the sprinkler system” lol. Gets mixed reactions 🤣 2
Marvin Posted March 9 Posted March 9 15 hours ago, Nickfromwales said: Yup. Whenever we test a whole of house plumbing system in front of clients I shout “OK……switch on the sprinkler system” lol. Gets mixed reactions 🤣 Yes. if anything, I prefer to see a mister system.... 1
Nickfromwales Posted March 10 Posted March 10 15 hours ago, Marvin said: Yes. if anything, I prefer to see a mister system.... The size of the droplets of water depends entirely upon whether we finished plumbing on a Friday afternoon or a Saturday morning lol.
ProDave Posted March 10 Posted March 10 18 hours ago, Nickfromwales said: Yup. Whenever we test a whole of house plumbing system in front of clients I shout “OK……switch on the sprinkler system” lol. Gets mixed reactions 🤣 Like when I energise a new electrical install I say "time for the smoke test" 1
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