December 6, 20232 yr See photos. The gismo is a water flow meter for a heat pump. It has the same fitting as a water meter would do - 1 inch bspp plastic threads. I've bought unions which use a fibre washer and these seem to sit ok and look like it will seal. The problem is the unions came with a 3/4inch bspp male thread. I've bought a BSPP female to 28mm compression fitting, but there doesnt appear to be anywhere for a washer to go, so how on earth can I seal this? Or have I bought the wrong fitting? Note - I've already destroyed 1 flow meter getting this wrong... Thanks
December 21, 20232 yr Generic stuff available at Screwfix https://www.screwfix.com/p/flomasta-pipe-sealing-cord-80m/2272v
December 21, 20232 yr Wrap the thread in PTFE tape. Do around 15 time around, sounds a lot, but does work. Wrap clockwise, and run your fingers around the PTFE tape to smooth it off and push it into the threads. Or Screwfix do a liquid PTFE, apply tighten and then leave while you have a coffee to harden.
December 21, 20232 yr Try the string and you'll be a convert away from PTFE I promise! Liquid seal is good if - if - you have the time to wait for it to cure and you don't then disturb the joint. The waxed string on the other hand can be busted/moved a little bit after fitting (e.g. to realign a fitting) and will still hold pressure.
December 21, 20232 yr 3 hours ago, markocosic said: Try the string and you'll be a convert away from PTFE I promise! Liquid seal is good if - if - you have the time to wait for it to cure and you don't then disturb the joint. The waxed string on the other hand can be busted/moved a little bit after fitting (e.g. to realign a fitting) and will still hold pressure. I've had this leak on my UVC after a year. I prefer Hemp and plumbers compound. It's old school but so long as you roughen the male threads beforehand I've had zero problems.
December 21, 20232 yr Loctite 55 leak? After roughing up threads etc? It's effectively hemp and paste, no? Or the pipe seal compound leaking?
December 24, 20232 yr On 21/12/2023 at 13:07, markocosic said: Loctite 55 leak? After roughing up threads etc? It's effectively hemp and paste, no? Or the pipe seal compound leaking? Don't know yet. Its losing a teaspoon a day. Its on the list of jobs to fix.
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