Boiler for Bolton triple engine

[Tony MartyrParticipant @tonymartyr14488]

I've just completed a Bolton design triple expansion engine. The valve timing of which is a bit of a pain – "if I ever made another I would do things differently etc"

As I thought I can't get it to run on compressed air, probably due to the very early cut-off required on the HP cylinder so I'm about to build the boiler and ancillaries system. To save some time I'm considering buying a Blackgates boiler kit but can't find an image of one on line. I could build a 4.5 or 5 inch dia vertical fire tube unit that would provide saturated steam at about 50 psi but I would like to hear from anyone who has steam run this or similar triples before I start

suggestions most welcome

Tony

[Tony MartyrParticipant @tonymartyr14488]

[nigel jones 5Participant @nigeljones5]

Ive built many a vertical boiler…what is the size and sweep of the first cylinder?

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