Whittles wrote: ↑Sun Aug 13, 2023 8:54 pm
Sorry this post is years off the mark but please could anyone please explain the best way to go about making a gas tank such as the one shown here, its going to be for a Lady Owain as well, any help would be apricated.
You dug deep to find that one......
You don't say what workshop equipment you have, or your prior model engineering experience. A gas tank is a pressure vessel filled with highly flammable gas and not the sort of thing I'd recommend to a beginner as a first project.
The minimum setup needed would be a lathe to make the bushes, a bench drill, metalworking hand tools and a suitable size propane torch, along with some prior experience with silver brazing (known as silver soldering in civilised countries). I use a 15mm propane torch tip for making gas tanks, as things like a Bernzomatic, or the torches that clip on a butane can, aren't up to the job.
Are you certain that the gas tank that comes with a Roundhouse Lady Anne boiler kit won't fit in the corner of the Owain cab? The Owain kit was designed to fit an Accucraft chassis that came with a horizontal tank, but that doesn't necessarily rule out the RH Lady Anne cab layout. The other advantage of a Roundhouse tank is that it comes with a test certificate.
The photo below shows a horizontal tank I made recently for my replica Dylan which is built on a Lady Anne chassis and boiler. It is made from two pieces of 3/4" square brass tube 60mm long, with 1/16" end plates. This meets the Aust. code for gas tanks using the local butane grade, but I've no idea if it is up to the job in countries that use butane/propane mixtures. It was silver soldered up using SB42 silver solder which is the commonly used silver solder grade used for model boilers here in Oz.
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The gas tank that came in the boiler kit would have fitted into the cab on this model, but that tank had already been used in another loco.
There's not a lot written on designing and especially building butane gas tanks for little locos., but the process is similar to building a boiler. You may find a few designs for gas tanks in project articles for garden scale locos.
Regards,
Graeme
