LNWR coal tank boiler

[jordanleeds]

I have recently commenced construction of a 5" gauge LNWR coal tank and glancing over the drawings there is no reference to working pressure/ design pressure can anyone advise how to go about finding this and also what work would be needed to raise the working pressure up above the design pressure?

[ettingtonliam]

Is this the one described in EIM? If so, is it in the articles, or failing that enquire from EIM, or whoever supplied your drawings.

Richard

[alanstepney]

I wouldnt even think about raising the pressure.
There is rarely any good reason for doing so, and if done, it can have more disadvantages than benefits.

Apart from which, it would mean a complete redesign (as far as testing and insurance goes) which is a lot of work.

So, WHY, do are you considering raising the pressure?

[jordanleeds]

It is indeed the One serialised in EIM however i dont have them to reference from as i made enquirys. And was quoted £136 for them alone. The thought of raising the pressure is One more of having a dryer steam. Uses.on.the engine and also Rather than a single superheater flue the fitment of two flues side bu side

[Andrew C]

Raising the pressure won't make much difference to the dryness of the steam. Increasing the superheater area will but and it is a big but, to do any good you will need to redesign the boiler then through all the testing etc.

Your best bet is to use the boiler as is and fit a good radiant superheater.

Andrew

[jordanleeds]

Thanks chaps! i shall make contact with Chris rayward and find out the relevant information and calculations. just looking ot order the copper shortly so its in store ready for when its needed

[greensands]

On the subject of placing an order for boiler materials how have you found the current market for buying the copper and silver-solder required for your boiler?
Regards

[durhambuilder]

not wishing to hijack the thread but I've just ordered all of the copper for my Superclaud boiler. prices for the kit of parts ranged from £325 to £612 but by cherry picking between the two cheapest I got the price down to £290 including two lots of carriage, admittedly I did already have a limited stock of sheet. Typical prices Live Steam Models 5 1/2" dia 10g boiler tube 13" long £56.32, Reeves 2000 same tube £162, 10swg copper sheet LSM £38.78 Reeves £105!!!
Live Steam Models and PLHill for me this time.

[jordanleeds]

thanks for that durham builder i shall look into it, i havent started sourcing materials as of yet as i need my club inspector to look over the drawings as there is no working pressure on them for the boiler design.

[brozier]

Hi,

I have just about every issue of EIM and had a look for the boiler pressure - It's 100psi.

The pressure is not mentioned at all when "Hotspur" is describing the boiler.

To find the pressure I had to backtrack to the first article Volume 15 No. 5 (October 1993) here he describes the Prototype and then on Page 145 the model is described including the boiler design pressure.

The articles written of the course of 6 years contain a lot of constructional detail so I'd say it's worth getting your hands on the Original mags or reprints.

Best Regards
Bryan

[jordanleeds]

thanks Bryan! great help it shouldnt be a issue now as the inspector will be placated now!
having been quoted £136 for the articals i have taken the aproach of buying them as and when funds permit