At 08:16 AM 5/2/01 -0400, you wrote:
>I notice that there are no crown stays above the firebox in Henk's design.
>Would that be a problem at the 60 psi working pressure noted in the writeup?
>Casey Sterbenz
Casey,
A combination of things does away with the need for them. The crown
sheet of course is actually a "beam" and as such must either be short and
stout, or be supported along its length. In this case the "beam" is very
short, and through a combination of material thickness, the staying effect
of the firebox sides, and the "corrugation"-like rolls in the crown, it is
made self-staying. The "corrugated firebox" was used quite a bit in full
size traction and portable engines. In the case of Henke's boiler my only
concern would be what effect a 120psi hydro test will have on that crown
sheet. Maybe none, depending upon the thickness of the metal.
Regards,
Harry Wade
Nashville, Tn
