Boiler End Plates

boiler endplates and tubes

Should boiler end plates on a copper boiler be concave or convex? Is there a reason they go one way or the other?

smokebox of traction engine lying on plan

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?

About Nigel 338 Articles
I've been making models since I was around 7 years old and using a lathe from the age of 11, a self taught engineer with a passion for making model engines.

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