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Popular Mechanics Boiler
ieezitin:
At work on our low pressure steam we use Key-Tite or never-seez on all threaded joints, my employer,s procedure calls for Teflon tape and Never-seez but I omit the Teflon tape. When we install unions we soap up the threads too so it comes apart easy.
One advantage of Key-Tite is that it never sets.
Ket-Tite is a registered Trade mark name.
Anthony.
awemawson:
When I re-plumbed my launderettes years back I did it in stages. Water distribution originally was in 2" screw galvanised. Getting a good seal onto fittings as I gradually replaced it all with copper over a few nights (keeping shop open during the day) was a nightmare. You could wrap as much teflon tape as you like round the male before screwing, and it would still leak - quite repeatable! I reverted to 'Boss White and Hemp' which instantly cured all problems. It wasn't until a bit later I found the reason. The hemp, put in dry, expands if a leak wets it and seals the joint. Sometimes the old ways are the best.
Not sure if 'Bosswhite' got across the great pond to the US but is a whiting and linseed oil composition. Now banned here for potable water.
vtsteam:
Thanks Anthony, I looked it up and it only seems available from the manufacturer with a $66 minimum quantity. :(
I also found this non Teflon stuff which seems pretty good in the specs:
http://www.gsasupplyco.com/gasntnonsofs.html.
Andrew -- is "whiting" white lead in linseed oil? I actually have some of that as an old unopened tub of traditional gesso.
ps. some forms of hemp are also banned here.....
mattinker:
Whiting is calcium carbonate, CaCo3 Chalk, the "hemp" is sometimes known as skrim in the UK I know what it is in French "fillasse" , I found oakum as a translation on the web. Wind the threads of hemp round the screw thread (previous in a clockwise direction as on would with teflon. It is very different to Lead oxyde. The jointing compound (or it's modern equivqlent)should be available in plumbing suppliers
Regards, Matthew
PekkaNF:
I pretty much hate teflon tape on any sytem that has small orifices, screens or such. I have cleand up fules systems, pumps etc. because someone had a bright idea. Bits of it always ends somewhere where it does most harm. Here probably into safety valve.
Teflon tape works on reasonably good brass fittings, when it is taped over male thread same way than you thread the union over it. DO NOT turn back at all when tightening. If turned back, it needs to be completely removed and replaced. Most good fittings works without it. Cast iron unions/iron pipe (central heating) seems to work best with traditional hemp/white paste. But pressure is not much in central heating system water circulation.
Pekka
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