eniacs Posted December 6, 2023 Share Posted December 6, 2023 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 Link to comment Share on other sites More sharing options...
markocosic Posted December 21, 2023 Share Posted December 21, 2023 Generic stuff available at Screwfix https://www.screwfix.com/p/flomasta-pipe-sealing-cord-80m/2272v 1 Link to comment Share on other sites More sharing options...
JohnMo Posted December 21, 2023 Share Posted December 21, 2023 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. Link to comment Share on other sites More sharing options...
markocosic Posted December 21, 2023 Share Posted December 21, 2023 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. Link to comment Share on other sites More sharing options...
Iceverge Posted December 21, 2023 Share Posted December 21, 2023 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. Link to comment Share on other sites More sharing options...
markocosic Posted December 21, 2023 Share Posted December 21, 2023 Loctite 55 leak? After roughing up threads etc? It's effectively hemp and paste, no? Or the pipe seal compound leaking? Link to comment Share on other sites More sharing options...
Iceverge Posted December 24, 2023 Share Posted December 24, 2023 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. Link to comment Share on other sites More sharing options...
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