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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Where to use PTFE tape - water connections
Should I use PTFE tape on threaded olive connections? I can get then
water tight but I have to tighten them up so much I worry I will break the thread (though I haven't yet) Also I assume you use plenty on threaded connections e.g. a TVR valve into a radiator? |
#2
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Where to use PTFE tape - water connections
In article ,
405 TD Estate writes: Should I use PTFE tape on threaded olive connections? I can get then water tight but I have to tighten them up so much I worry I will break the thread (though I haven't yet) PTFE should not be used anywhere near the sealing surfaces. One layer on the sliding surfaces makes a good lubricant to ease tightening them up -- that's the thread, and the back of the olive, but not the front or inside of the olive. If a compression fitting has failed and won't stop leaking with appropiate tighening, the PTFE on the sealing surfaces can sometimes make a reasonable bodge-it repair. Also I assume you use plenty on threaded connections e.g. a TVR valve into a radiator? Yes. Radiators and tails vary, but I tended to start with 10 turns. If it screwed all the way home without getting tight, dismantle, discard the used tape, and repeat with 12-15 turns. -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
#3
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Where to use PTFE tape - water connections
"Andrew Gabriel" wrote in message
... In article , 405 TD Estate writes: Should I use PTFE tape on threaded olive connections? I can get then water tight but I have to tighten them up so much I worry I will break the thread (though I haven't yet) PTFE should not be used anywhere near the sealing surfaces. One layer on the sliding surfaces makes a good lubricant to ease tightening them up -- that's the thread, and the back of the olive, but not the front or inside of the olive. I never put add anything anywhere near any compression fittings - just make sure everything is clean, bright and undamaged - that is how they are designed to be used Also I assume you use plenty on threaded connections e.g. a TVR valve into a radiator? Yes. Radiators and tails vary, but I tended to start with 10 turns. If it screwed all the way home without getting tight, dismantle, discard the used tape, and repeat with 12-15 turns. Indeed - I always do this even if it does tighten - fill the threads with PTFE by screwing in, then remove, add more and make the final seal. -- Bob Mannix (anti-spam is as easy as 1-2-3 - not) |
#4
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Where to use PTFE tape - water connections
On 9 Jan, 12:27, 405 TD Estate wrote:
Should I use PTFE tape on threaded olive connections? I can get then water tight but I have to tighten them up so much I worry I will break the thread (though I haven't yet) It sounds like you might be overtighening them, resulting in a worse seal (possibly through deformation). My rule of thumb is to hand-tighten the nut then add half a turn with the wrench (marking the nut/body can help if for some reason you need to do this in two go's e.g. limited access). Mathew |
#5
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Where to use PTFE tape - water connections
On Wed, 9 Jan 2008 04:27:37 -0800 (PST), 405 TD Estate wrote:
Should I use PTFE tape on threaded olive connections? No, compression joints should not require any thing other than finger tight plus 1/2 to 3/4 of a turn. A smallest smear of something on the inside of the nut to act as a lubricant is sometimes helpful. I can get then water tight but I have to tighten them up so much I worry I will break the thread (though I haven't yet) Presumably 'cause you've got lots of PTFE stopping the olive bite the pipe properly and seal against the fitting. Also I assume you use plenty on threaded connections e.g. a TVR valve into a radiator? Cast iron and other parallel threaded stuff is about the only place to use PTFE tape. -- Cheers Dave. pam is missing e-mail |
#6
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Where to use PTFE tape - water connections
In article ,
"Bob Mannix" writes: "Andrew Gabriel" wrote in message ... In article , 405 TD Estate writes: Should I use PTFE tape on threaded olive connections? I can get then water tight but I have to tighten them up so much I worry I will break the thread (though I haven't yet) PTFE should not be used anywhere near the sealing surfaces. One layer on the sliding surfaces makes a good lubricant to ease tightening them up -- that's the thread, and the back of the olive, but not the front or inside of the olive. I never put add anything anywhere near any compression fittings - just make sure everything is clean, bright and undamaged - that is how they are designed to be used In spite of what I said, I agree with you. I've only used it on large compression fittings where the librication was helpful. Never do this with gas pipework though, as you wouldn't be able to prove you hadn't got some PTFE into one of the seals. -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
#7
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Where to use PTFE tape - water connections
"405 TD Estate" wrote in message ... Also I assume you use plenty on threaded connections e.g. a TVR valve into a radiator? Is the TVR the sports version of the TRV ? :-) |
#8
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Where to use PTFE tape - water connections
"diy-newby" wrote in message ... "405 TD Estate" wrote in message ... Also I assume you use plenty on threaded connections e.g. a TVR valve into a radiator? Is the TVR the sports version of the TRV ? :-) It's the one that bits drop off on a regular basis until it seizes up and stops working. I think all of mine were like that when I bought the house because none of them lasted long. -- Dave Baker Puma Race Engines |
#9
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Where to use PTFE tape - water connections
In an earlier contribution to this discussion,
405 TD Estate wrote: Should I use PTFE tape on threaded olive connections? I can get then water tight but I have to tighten them up so much I worry I will break the thread (though I haven't yet) Also I assume you use plenty on threaded connections e.g. a TVR valve into a radiator? PTFE tape is designed for use on tapered threaded connections - where the seal has to be made within the threads. [When Adam were a lad, Boss White and hemp did the same job - albeit a bit less tidily]. So you should certainly use tape when screwing radiator valve tails into radiators. You should *not* use it on compression joints which - if done properly - seal perfectly when assembled dry. If you *must* put something on them, a smear of Boss White round the olive is preferable to PTFE tape, but probably acts more as a lubricant while doing it up than as a sealant. You should also not use tape on parallel threaded joints - which are designed to seal by means of a rubber of fibre washer between two mating faces, rather than on the threads per se. -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! |
#10
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Where to use PTFE tape - water connections
"Roger Mills" wrote in message
... In an earlier contribution to this discussion, 405 TD Estate wrote: Should I use PTFE tape on threaded olive connections? I can get then water tight but I have to tighten them up so much I worry I will break the thread (though I haven't yet) Also I assume you use plenty on threaded connections e.g. a TVR valve into a radiator? PTFE tape is designed for use on tapered threaded connections - where the seal has to be made within the threads. [When Adam were a lad, Boss White and hemp did the same job - albeit a bit less tidily]. So you should certainly use tape when screwing radiator valve tails into radiators. You should *not* use it on compression joints which - if done properly - seal perfectly when assembled dry. If you *must* put something on them, a smear of Boss White round the olive is preferable to PTFE tape, but probably acts more as a lubricant while doing it up than as a sealant. You should also not use tape on parallel threaded joints - which are designed to seal by means of a rubber of fibre washer between two mating faces, rather than on the threads per se. -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! I found that very interesting cos I have been using PTFE on compression. I will try to do without now. So where does "Boss White" fit into this then ? Richard |
#11
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Where to use PTFE tape - water connections
In an earlier contribution to this discussion,
Jack Fate wrote: "Roger Mills" wrote in message ... PTFE tape is designed for use on tapered threaded connections - where the seal has to be made within the threads. [When Adam were a lad, Boss White and hemp did the same job - albeit a bit less tidily]. So you should certainly use tape when screwing radiator valve tails into radiators. etc. I found that very interesting cos I have been using PTFE on compression. I will try to do without now. So where does "Boss White" fit into this then ? Richard I think Boss White was just one particular make. It's the same stuff as http://www.screwfix.com/prods/69694/...-Compound-400g. It's a putty-like substance, but a bit runnier than window putty. In the old days you would seal threads by dipping your finger in Boss White, wiping round the male thread and then winding thin strands of hemp onto it - the final bit being similar to the use of PTFE tape. It was particularly good (much better than PTFE tape) in cases where you needed a joint to be tight and leak-proof at the same time as facing in a particular direction - such as screwing an outside tap into a threaded flange, and needing the tap to be upright. I still use it on 'difficult' compression joints - especially if I have to dismantle and subsequently re-assemble a joint. Whilst on the subject of sealing pipe threads, I gather that PTFE *liquid* such as http://www.screwfix.com/prods/53863/...Compound-240ml is all the rage these days - but I haven't yet tried it. Maybe it will replace PTFE tape *and* Boss White? -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! |
#12
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Where to use PTFE tape - water connections
Bob made the most significant point - cleanliness! A bit of grit can ruin a good seal. |
#13
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Where to use PTFE tape - water connections
Roger Mills wrote:
Whilst on the subject of sealing pipe threads, I gather that PTFE *liquid* such as http://www.screwfix.com/prods/53863/...Compound-240ml is all the rage these days - but I haven't yet tried it. I used it (actually Screwfix 'No Nonsense' brand) for the tails of the three new radiators to TRV's and lockshields that I installed here recently and it worked a treat. Maybe it will replace PTFE tape *and* Boss White? It will for me ;-) With careful application, just a smear all over the threads, it lubricated the threads well and helped with the doing up and left me with only a slight ring of the stuff that was easily wiped away. Far better than trying to pick away bits of PTFE tape that would have protruded and spoilt the appearance of the chrome TRV4's! But, as this has been said before in this thread (sorry for pun), it or any other sealant is not intended to make olives watertight. Steve |
#14
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Where to use PTFE tape - water connections
On Wed, 09 Jan 2008 04:27:37 -0800, 405 TD Estate wrote:
Should I use PTFE tape on threaded olive connections? I can get then water tight but I have to tighten them up so much I worry I will break the thread (though I haven't yet) Also I assume you use plenty on threaded connections e.g. a TVR valve into a radiator? On joints that make their seal using threads. However string (aka loctite 55) and resin (e.g. Liquid PTFE) do the job better, IME. -- Ed Sirett - Property maintainer and registered gas fitter. The FAQ for uk.diy is at http://www.diyfaq.org.uk Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html |
#15
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Where to use PTFE tape - water connections
Dave Liquorice wrote:
On Wed, 9 Jan 2008 04:27:37 -0800 (PST), 405 TD Estate wrote: Should I use PTFE tape on threaded olive connections? No, compression joints should not require any thing other than finger tight plus 1/2 to 3/4 of a turn. A smallest smear of something on the inside of the nut to act as a lubricant is sometimes helpful. I use PTFE on the threads of compression joints - only 1 or 2 turns - simply as a lubricant. Agreed never on the olive. -- Dave - The Medway Handyman www.medwayhandyman.co.uk 01634 717930 07850 597257 |
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