On 17/2/04 5:49 pm, "mart.towers" <[EMAIL PROTECTED]> wrote: > As the tank will almost certainly be loco mounted butane will work OK, as > the temp drop will be balanced by the radiant heat gain from the > boiler/chassis. Also what manufacturer recommends. > However butane/propane mixtures & isobutane needn't cause any alarm if the > snow is thick on the ground up there in the woods & butane gives a flaccid > response. > Roundhouse tanks are pressure tested and are good to psis in the thousands. > (filler valves much, much less of course) > If it's a second hand loco check that some clown hasn't moved the tank close > to the boiler in which case mixtures or isobutane are a no-no. Well the > whole thing is a no-no in that case, IMO.
Roundhouse gas tanks are designed for butane AND propane/butane mix and have been for some years. The current firing systems are (according to Roger Loxley of Roundhouse) designed for butane only - hence the label on the tank. I have not myself seen any difference in performance - but I prefer to believe the guys that build 'em. Couple of predictions here. Roundhouse will move to "mixed gas" this year. They are also likely to use gas pressure regulation - as Cheddar do now. Boiler fill systems (and gauge glass) on all new engines - this last isn't a prediction - it is already in place. We will shortly see whistle and/or draincocks on RH locomotives.... -- Tag Gorton Editor Garden Rail Atlantic Publishers http://www.trevor-ridley.co.uk/index.html Editor 16mm Today http://www.16mmngmodellers.org.uk/
