Should boiler end plates on a copper boiler be concave or convex? Is there a reason they go one way or the other?
One reason for the convex endplates is that I intend to rivet the smokebox to the boiler of my miniature traction engine.
The rivets cannot go through the boiler surface forming a hole into the steam volume and a leak path.
On the other end of the boiler the connection is to the firebox and again I need to fix this through the surface of the boiler. Hence the end dome is again concave.
Hence we come back to the question as to whether the endplates of a boiler should be concave or convex? Or even does it matter?