Model Boat Mayhem

The Shipyard ( Dry Dock ): Builds & Questions => Steam => Topic started by: 3838Derrick on April 03, 2017, 07:08:54 pm

Title: Sealer
Post by: 3838Derrick on April 03, 2017, 07:08:54 pm

Is there a sealer that you guys use when screwing fittings into a boiler?

Title: Re: Sealer
Post by: Baldrick on April 03, 2017, 07:27:02 pm

http://www.ebay.co.uk/itm/like/152474948117?chn=ps&adgroupid=39613511478&rlsatarget=pla-279121822241&abcId=923836&adtype=pla&merchantid=115069114&poi=&googleloc=9045848&device=c&campaignid=737386489&crdt=0

Title: Re: Sealer
Post by: derekwarner on April 04, 2017, 06:37:17 am

3838Derrick...............

Model boilers appear to range from 1.5 Bar to 5 Bar working pressure

A boiler with a relief valve setting of 3 Bar will produce steam at ~~135 degrees C on your boiler steam discharge valve

The Technical Data sheets for these Loctite type products  are limited to ~~120 degrees C, however to remove a fitting.....heating to ~~160 degrees C may be required

Long before these Loctite products were developed and marketed, copper shimmed washers were used for sealing boiler valving.......

If an ill-fitting height occurred with the alignment of a steam valve fitting ........some times that RED Stag    >>:-(jointing compound was used

This would however never be recommended in a model valving seating.....

Derek

Title: Re: Sealer
Post by: KNO3 on April 07, 2017, 10:05:39 pm

I recommend Teflon tape. Much easier to use, remove if necessary and clean up than Loctite, for boiler fittings.

Title: Re: Sealer
Post by: rhavrane on April 08, 2017, 09:23:08 am

Bonjour,
Personally, I use a combination of Loctite 577 and Teflon, specially when screw threads or viroles are thin because I already broke several of them screwed too hard (and hard very relative). It is not obvious at all to stop a leak, and going on screwing is not the best solution an example here at 1'00 : https://www.youtube.com/watch?v=t-EI3i1Bhcc .
The worst leak is not the steam one, but the gas one, gas is the fluidest product we manipulate and the most dangerous one  ! 

Title: Re: Sealer
Post by: Waz on April 08, 2017, 11:11:43 am

Normally I use Teflon tape and a copper washer, however if the fitting needs to be in a certain orientation then I use a copper compression washer. Where the faces are really bad you can use Loctite 574 but be warned this does take 24-48 hours to cure so don't expect to be able to put it on screw the fitting in and then go back an hour later and steam.

Title: Re: Sealer
Post by: tonyH on April 08, 2017, 01:59:41 pm

Loctite 272 works well and has a service range of up to 200 degrees C but needs heating up to remove it.


Tony