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[Klunk]

can you use ptfe or boss white for threaded pipes on a boiler? THE PIPE COMES OUT OF THE BOILER as and elbow and then a straight pipe. it is at this joint i NEED to seal

[derekwarner]

klunk ...PTFE tape certainly has the thermal properties capable of withstanding model boiler steam temperatures.....[150 degrees C]. [Loctite 567 {liquid teflon} is listed as suitable for use @ 205 degrees C]

However most commercially build boilers use fiber or annealed copper washers for the main threaded bushing connections

The only down side here is that you may need to lap the boiler bushing surface to obtain the desired fitting alignment.....Derek

[Underpressure]

I have used PTFE tape on and old boiler (NO! Not the wife) of unknown manufacture that I have had for many years. It's worked fine and passed several boiler tests in that time. Loctite Loc'n'Seal will also do the same job, which is what I have used on my Cheddar Proteus boiler.

Always nice to have a choice.

Neil

[HS93 (RIP)]

good job it passed  ..........as you where the tester   



Peter   

[Klunk]

some pics of the area effected
pic1 is the boiler area, it is at this elbow that I need to rejoin.
pic2 is straight section to the water level tube.
pic 3 is the  pressure release
pic 4 is the threaded joiner at the elbow/straight piec that needs to to sealed with ptfe or equivalant.
pic 5 is the pressure release agin
the others are genral of the cylinder end

[Underpressure]

That's a Cheddar Puffin boiler. Cheddar used to supply Loctite Loc'n'seal in the kit for all those metal to metal joints. I have recently been using Loctire 243 to do the same job as Loc'n'Seal is not available locally. Both products allow you to screw the fitting into position and align it, before it sets, but they do set pretty quickly. The same method was / is used to seal all the blanking plugs in the boiler.

You can get a full set of O rings, for the glass gauge and also for the safety valve from Jerry Watson at Clevedon Steam: http://stores.shop.ebay.co.uk/Clevedon-Steam__W0QQ_armrsZ1

Peter, when I was boiler tester, getting my own kit tested was a PIA, as who can test the testers test? In the case of my old boiler I had the first test done by a local boiler maker, Ron .... I can't recall his surname. By the time it needed testing again, we had recruited a few more testers   

[derekwarner]

mmmmm a quotation from the Henkel...Loctite WEB page ...my only real concern is the boiler steam discharge valve screwed joint @ ~~~~~150 degrees C ........Derek

LOCTITE® 243™ is designed for the locking and sealing of
threaded fasteners which require normal disassembly with
standard hand tools. The product cures when confined in the
absence of air between close fitting metal surfaces and
prevents loosening and leakage from shock and vibration.
Particularly suitable for applications on less active substrates
such as stainless steel and plated surfaces, where
disassembly with hand tools is required for servicing. The
thixotropic nature of LOCTITE® 243™ reduces the migration of
liquid product after application to the substrate.
NSF International
Certified to ANSI/NSF Standard 61 for use in commercial and
residential potable water systems not exceeding 82° C.

[Underpressure]

As I said, Cheddar used to supply Loc'n'Seal. If you can find that, or its numbered equivalent, then that is what I would go with.

Neil

243 datasheet: http://www.loctite.sg/sea/content_data/93815_243EN.pdf