Re: Boilers

>The new FRA rules don't outlaw lap-seam boilers. Lap-seam boilers are still legal, but they do have some specific and more stringent inspection requirements. This is reasonable due to the higher potential for problems with this type of construction.<
True, Part 230.30 does require an annual inspection inside and out of unreinforced lap joint longitudinal seams.
Also, you are correct that Part 230 does not "outlaw" lap joints. However, Part 230.24(b) does require a factor of safety of 4 if the original code of construction is used. This requirement could affect boilers constructed prior to about 1913.
An additional question in my mind has to deal with repairs that are made. For example, an item is perfectly acceptable under the original code of construction but if that item is to be repaired or modified, could the original code of construction be followed or should current code of construction be followed.
Given my experience, I would tend to follow the new code of construction requirements.
From a historical perspective, if the WW&F #9's boiler is in such condition that there is a question concerning it's integrity, I would prefer to see the old boiler retained in it's entirety as a display piece, than to modify it through extensive repairs. I think that it is highly possible to construct a new boiler that has the appearance of the old boiler (after all you can't see under the lagging) to allow the locomotive to continue to operate.
To me the combination of the old boiler on display complete with explanations of the technology of the era contrasted to the current requirements would be an excellent exhibit. One only has to tour the main floor of the Museum of Science and Industry in London to see the importance of this type of exhibit. In their galleries, you can trace the development of steam power starting with Savery, Newcomen and Watt on up to the present day.