<HTML>Hi Rolly,
Yowch! What type/size of boiler was this? Thanks for the heads-up on the insurance/regulatory hurdles. This sure points out the advantages of drumless boilers, and those with little or no welding or homebuilt jointing. Though I bet those have their own paperwork hassles, and they definitely have technical disadvantages relative to a Lamont or other type.
I have been told that some states exempt boilers below a certain size, and it is possible that a number of those units plumbed together, a la Andy Patterson's multi-boiler concept, would also be exempt. Only the boiler inspector knows for sure. Or at least his opinion is what counts. A steam car old-timer once told me that a state boiler inspector angrily refused to inspect his small high-pressure monotube -- "don't waste my time!" Laws and practices vary from one jurisdiction to the next.
I have been keeping an eye on custom iron castings, which definitely have advantages. The layered steel-plate heads currently on my drawing board would be heavier, and more costly in mass production, but easier & cheaper, I think, in the prototype stage and in possible pilot production. They also have a few technical advantages over cast-iron heads/blocks.
If I end up doing iron castings, I will seriously consider building a small cupola furnace a la Steve Chastain or Stewart Marshall's plans in the Lindsay catalog [
www.lindsaybks.com] Some of those suckers can do serious iron pours, and they don't look too tough to build. From the foundry prices I've heard of, I think one of these would pay for itself with the first pour.
I have some experience with patterns, sand molds, and furnace operation, and have a circa 1980 Pyramid brand propane foundry set for pours of 10 lbs or so. Foundry work is not for the careless or faint of heart! I can do it, and it's real pride of workmanship when finished, but masses of glowing liquid metal, crucible handling, sand explosions, gas furnace flame-outs/backfires, etc still give me the willies. The hiss and grumble of a fresh-poured green sand mold have to be heard to be believed. Really satanic stuff.
I sure understand why most guys leave foundry work to the pro's. Legal disclaimer: I do not advise or advocate a home foundry for anyone -- "kids, don't try this at home".
Peter</HTML>