hallo john
Charles here
now that's music to my ears , at least it gives me an idea .. i just have the
chance of picking up some 2mm copper enough for the bullied rebuilt ,,,you are
Wright about lbsc that's what he recommended a bit doggy these days ,,threading
copper is ok,, overtighten the union and you loose the thread ,,nice meaty
bushes is the order of the day ,,,,progress is slow this end just about
finished the pony truck steel prefabricated job the whole lot was tacked
together with the mig all in 1/8 steel i will send a picture through to you
when it looks half decent thanks for the information john ,,,,,at least i am
on the Right track,,,,,,,,,Charles

----- Original Message -----
From: John Baguley
To: halfinchlivesteamforum@...
Sent: Monday, May 12, 2008 4:54 PM
Subject: [Half inch live steam forum] Re: question on boiler material


Hi Charles,

I am not sure if there is actually a spec laid down over here for
metal thickness versus boiler size. However, the 'standard' seems to be :

barrel, wrappers, and crown stays - 16swg (1.6mm)
Smokebox tubeplate, throat plate, backhead, firebox plates - 13swg (2.5mm)
Tubes - 18swg or 20swg (0.9/1.2mm)

For a small boiler you can get away with 16swg for the throat plate,
firebox tubeplate and firebox door plate. Makes flanging the plates
much easier as well. I've read that the only reason for using 13swg
for the backhead was that LBSC used to thread his fittings straight
into the copper without using bushes and the thicker metal gives more
thread. I would not recommend that practice nowadays though!

John

--- In halfinchlivesteamforum@..., "charles"
<mortimer@...> wrote:
>
> what is the british standard of boiler thickness to obtain a
> certificate on 2.5 gauge is it 2mm thick or code l 3mmthick tube just
> checking before i buy some copper
> charles australia
>





[Non-text portions of this message have been removed]