Susan wrote:
> See: http://www.copper.org/tubehdbk/figures/figure3.html
>
> For info on collapse pressures of copper tube. Use the annealed table.
>
> Don't forget to allow the 8x safety margin and an allowance for wear.
Keep in mind that those tables already have a safety factor built into
them. Which means that running at 1/8th the pressure shown in those
tables is just that much better!
> So the 0.032" to 0.035" wall (approx 20-21 SWG) tube looks okay - over
> 550 psi which will give a max 70 psi working pressure.
>
> My understanding is that about 1/4" ID is the smallest workable tube for
> a locomotive (i.e. horizontal) boiler.
Thanks. I'm still juggling ideas; I may have to resort to some
prototyping.
- - Steve
