Thread locking inside boilers

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Thread locking inside boilers

This topic has 11 replies, 8 voices, and was last updated 25 January 2022 at 18:14 by John Purdy.

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24 January 2022 at 13:02 #582105
John Billard 1
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@johnbillard1
What is the best sealant to use these days for screwed joints within a 5" gauge boiler when subsequent access might be "difficult".

Best wishes

John B
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24 January 2022 at 13:02 #2115
John Billard 1
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@johnbillard1
24 January 2022 at 13:22 #582107
Former Member
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@formermember12892
[This posting has been removed]
24 January 2022 at 13:22 #582108
Former Member
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@formermember12892
[This posting has been removed]
24 January 2022 at 13:22 #582109
Former Member
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@formermember12892
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24 January 2022 at 15:03 #582118
KWIL
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@kwil
br,

It must be something you do, does not happen to me!
24 January 2022 at 15:58 #582127
Grindstone Cowboy
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@grindstonecowboy
Not saying it's the cause of multiple posts, but I sometimes double-click where I should single-click.

And to (partly) answer John B's original question, I'm afraid I've never built a boiler. However, I have had success with this for other sealing requirements, and I'm sure I read somewhere that it's suitable for steam. Doubt whether it has any thread-locking capabilities, though.

Rob

Links to https://rectorseal.com/rectorseal-tru-blu-group/
25 January 2022 at 08:42 #582256
John Rutzen
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@johnrutzen76569
Hi, I think Loctite is ok with steam for say screwing a thread into a boiler to hold on a support bracket but it does lose it's strength as I found out. I had screwed my regulator rod into the cam it used to operate the device and sealed it with loctite. I steamed up and wondered why the loco wouldn't move – the thread had unlocked itself! So I don't know of any thread sealant which will do anything other than seal inside a boiler.
25 January 2022 at 11:50 #582302
John Billard 1
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@johnbillard1
Thanks for the replies. I am just interested in sealing threads at the moment e.g.main steam pipe in to the regulator and oil pipes etc into unions/bushes.

Farmer para 287 uses Boss White but this was 1964.

John B
25 January 2022 at 12:16 #582311
Paul Lousick
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@paullousick59116
I used graphite sealant on the studs that screw into the barrel on my boiler. Graphite based compound is the traditional sealant for threaded and flanged connections on steam engines.
25 January 2022 at 12:21 #582314
old mart
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@oldmart
Google Loctite thread sealants to get the exact specifications. https://www.turtle.com/ASSETS/DOCUMENTS/ITEMS/EN/Loctite_21472_Catalog.pdf

**LINK**

Edited By old mart on 25/01/2022 12:24:09
25 January 2022 at 18:14 #582377
John Purdy
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@johnpurdy78347
I have used Loctite PST high temperature thread sealant #567 on my boiler fittings (internal and external), for many years and have never had a problem. Its a white paste in a tube, Loctite part #56747. It doesn't set hard so fittings can be easily removed in the future. According to the spec sheet its strength reduces to 55% of initial strength after 1000 hours exposure at 250C (482F). That's equivalent to a boiler pressure of about 550 PSI.

John

Edited By John Purdy on 25/01/2022 18:20:19

Edited By John Purdy on 25/01/2022 18:51:58
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