[modeleng] Re: Headers and domes
- From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Tue, 26 Oct 2004 22:29:44 +0100
I would opt for PB, but I am not aware of anyone who makes socket head
screws in that material.
Although I am not keen on stainless steel in model boilers, in the case of
the wet header, I cannot foresee any great problems with it, even if they do
go through into the boiler. In either case, I would ensure that there wasn't
any thread actually inside the boiler, as it could get corroded, and make it
harder to remove.
Also, and I may be being over-cautious, if I did use SS, I would take the
header off every two years, or maybe annually, and inspect for signs of
pitting.
Not a bad thing to do in any case as superheaters get a lot of wear and
tear.
alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
www.alanstepney.info
Model Engineering, Steam Engine, and Railway technical pages.
----- Original Message -----
From: "Tim Rickard" <the_viffer@xxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Monday, October 25, 2004 5:15 PM
Subject: [modeleng] Headers and domes
I'm fitting out a loco with a nice new boiler. Has anyone any thoughts on
the best fasteners for the wet header and the dome? I'm thinking terms of
either phospor bronze or cap head socket stanless in either case with a bit
of copper grease and a jacking screw provision. Anyone any thoughts or know
if I can get socket phospor bronze?
I know that with stainless I need to have blind holes in the boiler bush to
avoid electrolytic damage to the screw but what about pb? it seems to me
that by going all the way through I decrease the chance of breaking a tap
but increase the chance of a leak.
Also I've been told (and Johnson Matthey's website bears it out that brazing
stainless with Easyflo results in the likelihood of crevice or interfacial
corrosion in the presence of sulphur and therefore that one should use
Argobraze 56 instead. Anyone got any thoughts on this one?
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