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I'm building a 1/3 size steam roller...I used the ASME Section I calculations, part PMB specifications, code materials, and all Section IX welding requirements even though in most states it will be smaller than the size they will usually bother to inspect..... However, it also cost about twice as much for me to do it that way. Yes, I could have saved a lot of time, money and aggravation and still have had a quite safe boiler, but the burden of proof for any design is laid squarely at the builder's doorstep, and it's often easier to argue if you followed an accepted practice.... While the ASME code is absurdly impractical in Gauge 1, there are several standards, (British and Australian to name a couple) that are quite workable. (BTW I'm still having the devil's time getting my boiler inspected in Pa because nobody wants to be the first person to sign off on it.)  I also strongly recommend using commercial made safety valves, even if you scratchbuild everything else...they really aren't all that expensive. If you can get one, a Bagely type is much better than a checkball and spring. Sizing is important, it should be able to relieve the pressure faster than you can build  even with a roaring fire...if in doubt use two, besides the full sized ones did.   There are lots of other important things to consider... Like material selection -- Use copper and bronze for small boilers and fittings, not brass. Use true silver solder, not the cheaper silver bearing stuff. Also, try to design your fuel supply so that it runs out BEFORE you run out of water (that should be obvious, but it isn't always done, and cooked boilers are no fun). Make it maintenance friendly....Cleanouts-you really can never have too many, especially with a wet leg firebox. Accessibility- whatever you can't access easily will usually be the first thing to go wrong. Lubrication- should be obvious, grease and oil are MUCH cheaper than hard parts. If you have space an adjustable dead leg cylinder lubricator is better than a pass through, which is better than none at all.... Confused yet?
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