mott
Hi-poster
Posts: 151
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Post by mott on May 10, 2006 7:19:46 GMT
Hi guys, I am having difficulty in making the joint between the barrel of my boiler and the inner dome steam tight. Its quite a narrow flange which makes it difficult to make a new gasket from card which doesn't break around the studs. What fexible gasket material could I use instead? I tried one by a company named Kent called "sili -gasket" but at about 50lb pressure it blew. Hylomar - blue wasn't strong enough. Green Hermitite has been mentioned. I also have some loctite flange sealer but am doubtful that it will stand up to the high temperature. I have beefed up the bolts clamping the flange already and the joint will be metal to metal if I go down this route. A friend has suggested instead making up a copper gasket, well annealled which would do the job but if there is a flexible sealer out of a tube it would be much easier! Mott
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Post by baggo on May 10, 2006 9:11:53 GMT
I was reading the Britannia Builders Diary the other day and it mentions a sealant called Foliac Graphited P.J.C made by Rocol which Modelworks use for sealing the cylinder backplates. Looking up the specs it appears it will withstand temps of 450 degrees C and pressures of up to 1400PSI ! It might be worth giving that a try. It needs to be left for 24hrs at least though before using. Loctite also do some liquid sealants for pipe flanges etc. that may be suitable. I have seen Hermetite gasket sealants recommended as well.
John
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Post by Deleted on May 10, 2006 15:01:09 GMT
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mott
Hi-poster
Posts: 151
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Post by mott on May 10, 2006 17:36:31 GMT
Hi Guys, Debbie says use the gasket, she is supplying a spare, with blue Hylomar. I have several pots of Foliac supplied with my 14XX kit but have not used them because I was advised by other builders that foliac dries out over time. I wonder if this is the same spec as the foliac PJC made by Rocol mentioned in the Britannia Builders site? Mott
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Post by davidimurray on May 16, 2006 12:46:59 GMT
We always used to make our own version of Foliac at the railway where I worked. Consisted of mixing graphite powder with cylinder oil until you got a nice thick paste. Worked a treat!
Cheers
Dave
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