volmaakt Posted November 5, 2020 Report Share Posted November 5, 2020 Hello. Any recommendations for what to use for sealing the fittings (compression) going into the back of my boiler stove? PTFE? Stove silicone? Thanks Link to comment Share on other sites More sharing options...
matty40s Posted November 5, 2020 Report Share Posted November 5, 2020 Link to comment Share on other sites More sharing options...
volmaakt Posted November 5, 2020 Author Report Share Posted November 5, 2020 Ta. Is that a fancy (better?) version of Boss White? Link to comment Share on other sites More sharing options...
Tracy D'arth Posted November 5, 2020 Report Share Posted November 5, 2020 33 minutes ago, volmaakt said: Hello. Any recommendations for what to use for sealing the fittings (compression) going into the back of my boiler stove? PTFE? Stove silicone? Thanks Should need nothing, just the olives, finger tight and then half a turn will be fine. Do not overtighten, its totally unnecessary and just damages the olive and leads to leaks. Link to comment Share on other sites More sharing options...
volmaakt Posted November 5, 2020 Author Report Share Posted November 5, 2020 It was more the threaded bit going directly into the stove I was wondering about. Link to comment Share on other sites More sharing options...
BEngo Posted November 6, 2020 Report Share Posted November 6, 2020 Wot matty said, or liquid PTFE. PTFE tape struggles on larger threads, especially if you follow the instructions and only use 3 turns. If you must use tape on a larger fitting go for the thicker gas stuff in a yellow reel and use plenty- at least 6 turns. N Link to comment Share on other sites More sharing options...
bizzard Posted November 6, 2020 Report Share Posted November 6, 2020 And wind it on in the correct direction or it's likely to unwind when the fitting is screwed on, especially the thick gas tape. Link to comment Share on other sites More sharing options...
Slim Posted November 6, 2020 Report Share Posted November 6, 2020 (edited) 17 hours ago, Tracy D'arth said: Should need nothing, just the olives, finger tight and then half a turn will be fine. Do not overtighten, its totally unnecessary and just damages the olive and leads to leaks. On my Morso the boiler stubs were a BSP so some form of sealant was required. Can't remember what I used. On the matter of connections has anyone used any form of flexible pipe between the stove and the pipework?. When I fitted the stove (years ago) I managed to work within the limited space. These days my chances of getting in there are zero. Edited November 6, 2020 by Slim Link to comment Share on other sites More sharing options...
Tracy D'arth Posted November 6, 2020 Report Share Posted November 6, 2020 27 minutes ago, Slim said: On my Morso the boiler stubs were a BSP so some form of sealant was required. Can't remember what I used. On the matter of connections has anyone used any form of flexible pipe between the stove and the pipework?. When I fitted the stove (years ago) I managed to work within the limited space. These days my chances of getting in there are zero. The connectors used for copper cylinders are 1" BSP , just need a washer to seal to the stubs Link to comment Share on other sites More sharing options...
David Mack Posted November 6, 2020 Report Share Posted November 6, 2020 45 minutes ago, Slim said: On my Morso the boiler stubs were a BSP so some form of sealant was required. 17 minutes ago, Tracy D'arth said: The connectors used for copper cylinders are 1" BSP , just need a washer to seal to the stubs Depends whether the stubs have taper or parallel threads. Sealant or ptfe tape for taper threads, fibre washer for parallel threads Link to comment Share on other sites More sharing options...
Tracy D'arth Posted November 6, 2020 Report Share Posted November 6, 2020 10 minutes ago, David Mack said: Depends whether the stubs have taper or parallel threads. Sealant or ptfe tape for taper threads, fibre washer for parallel threads They are parallel threads, cylinder connections have loose nuts that are also parallel and a face seal on the union, no ptfe tape needed, just a washer Link to comment Share on other sites More sharing options...
blackrose Posted November 6, 2020 Report Share Posted November 6, 2020 (edited) 1 hour ago, bizzard said: And wind it on in the correct direction or it's likely to unwind when the fitting is screwed on, especially the thick gas tape. That's what I use. Edited November 6, 2020 by blackrose Link to comment Share on other sites More sharing options...
bizzard Posted November 6, 2020 Report Share Posted November 6, 2020 6 hours ago, blackrose said: That's what I use. Example. Hold the fitting with the thread on it in your left hand and wind the tape on clockwise,''looking at the threaded end of the fitting'' keeping tension on it as you wind, like using self amalgamating tape. Zooming of course its a normal righthand thread. Link to comment Share on other sites More sharing options...
system 4-50 Posted November 6, 2020 Report Share Posted November 6, 2020 24 minutes ago, bizzard said: Example. Hold the fitting with the thread on it in your left hand and wind the tape on clockwise,''looking at the threaded end of the fitting'' keeping tension on it as you wind, like using self amalgamating tape. Zooming of course its a normal righthand thread. depending of course on which hemisphere you are in. Link to comment Share on other sites More sharing options...
Jen-in-Wellies Posted November 6, 2020 Report Share Posted November 6, 2020 (edited) 7 hours ago, David Mack said: Depends whether the stubs have taper or parallel threads. Sealant or ptfe tape for taper threads, fibre washer for parallel threads The Morso back boiler threaded stub connections are 1" BSP parallel thread. Uses a flanged back nut on the outside to fit, so a fibre washer under is a good idea. The presence of the back boiler should keep temperatures reasonable for the fibre washer. Mine hasn't got any, just metal to metal. From there I used 1" BSP to 28mm compression angles to connect to the gravity circulation pipework. Jen Edited November 6, 2020 by Jen-in-Wellies Link to comment Share on other sites More sharing options...
David Mack Posted November 6, 2020 Report Share Posted November 6, 2020 1 hour ago, Jen-in-Wellies said: From there I used 1" BSP to 28mm compression angles to connect to the gravity circulation pipework. But to seal, you should have had a fibre washer between the end of the boiler stub pipe and the seating face inside the brass angle fitting. Link to comment Share on other sites More sharing options...
Jen-in-Wellies Posted November 7, 2020 Report Share Posted November 7, 2020 9 hours ago, David Mack said: But to seal, you should have had a fibre washer between the end of the boiler stub pipe and the seating face inside the brass angle fitting. Yes it should. I sealed it with ptfe tape and no leaks in the last thirteen years, but this isn't the proper way of doing it. Link to comment Share on other sites More sharing options...
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