Tapping into boiler

This topic has 10 replies, 7 voices, and was last updated 9 November 2012 at 19:39 by nigel jones 5.

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6 November 2012 at 12:20 #102968
nigel jones 5
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@nigeljones5
Ive just drilled my 7ba pilot hole too deep and gone straight through the boiler wall. Ibe tapped 7ba and coated the bolt threads with bearing lock (weak loctite), should this be enough to stop it leaking?
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6 November 2012 at 12:20 #6424
nigel jones 5
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@nigeljones5
6 November 2012 at 12:37 #102969
Jeff Dayman
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@jeffdayman43397
At room temperature, probably, but at steam temperature, not likely. If it were me, I'd drill it out (and all others like it) and fit bronze bushes silver soldered in place.

Many designers of model engines specified tapped holes into the boiler shell for attaching things, Martin Evans in particular, even if only two full threads would be possible. Just not good practice. A boss through, or a tapped lug soldered on the outside of the shell under cleading is a much safer method.

JD
6 November 2012 at 14:02 #102979
KWIL
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@kwil
Steel boiler Fizzy? Weld the hole with MIG?
6 November 2012 at 18:10 #103003
nigel jones 5
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@nigeljones5
I can easily weld it but didnt want all the hassle of prepping into 6mm steel. I would tig it to be sure of penetration, but then it would be a pig to redrill and tap.

remember its only 7ba
6 November 2012 at 18:20 #103004
JasonB
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@jasonb
Can't you drill it out to say 1/4" prep and weld in a pre tapped blind bush made from a bit of 1/4" rod.

J

Edited By JasonB on 06/11/2012 18:21:27
6 November 2012 at 18:30 #103007
nigel jones 5
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@nigeljones5
hi Jason – not a chance. The amperage required to get good penetration would obliterate the bush for sure. Im gona take my chances with the loctite, its screwed in pretty tight so even if there is a small initial leak it wont be long before it gets filled with boiler gunk and blocks up! (tiny fragments of rust etc).
9 November 2012 at 00:16 #103182
Springbok
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@springbok
Hii Fizzy is it still pink??
9 November 2012 at 08:18 #103185
S.D.L.
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@s-d-l
Posted by fizzy on 06/11/2012 12:20:09:

Ive just drilled my 7ba pilot hole too deep and gone straight through the boiler wall. Ibe tapped 7ba and coated the bolt threads with bearing lock (weak loctite), should this be enough to stop it leaking?

Why not silver solder a bush in.

Steve Larner
9 November 2012 at 09:07 #103186
Dave Jones 1
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@davejones1
Sorry to hijack the thread, but I have a similar problem with a misplaced 1/8" hole drilled through a copper boiler. Could anyone advise if it would be safe to use a 1/8" solid copper rivet to fill the hole and then silver solder over it after it was fitted? If it makes a difference its a 3 1/2" gauge northumbrian boiler if that makes a difference.

Dave
9 November 2012 at 19:39 #103236
nigel jones 5
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@nigeljones5
that will be fine
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