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Member postings for Alan Worland

Here is a list of all the postings Alan Worland has made in our forums. Click on a thread name to jump to the thread.

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Thread: HTS Bolts
31/12/2009 13:33:03
I use similar 'T' nuts to Circlip and use long bolts where I can, the bolt is wound through the T nut until the bolt end touches the base of the slot, jacking the nut up which secures it in place and thus stops it/them moving around - which I find they always do at the wrong moment!
Thread: Selecting a size of boiler to a marine steam engine of known size..
28/12/2009 22:12:51
I have just purchesd the above mentioned book from Ebay (10.50 inc p&p) in the hope it will help establishing my boiler feed water supply - there were 2 on there, the other one went for £7 or so!
I dont know when the book was first published but I am also hoping that I might be able to identify my existing boiler design.
Thread: Boiler Feed Pump
18/12/2009 15:33:45
Wow! That a lot to take in, thanks to all.
This is where I am at::
I have discovered (from Stuart) that the engine should be mounted horizontally to enable the sump to retain oil for splash lubrication. Doing this has moved it forward into the space where the paraffin burner tank was located.
As I remember this burner was an all or nothing device, which was great if you required flat out power, but I want more control over the flame with a requirement for more sedate running.
Work is progressing on the feed pump drive which is going to use a worm on the crank (36:1)  driving a 1/4 in bore pump with the stroke to be determined.
Probably over the Christmas period I shall fire it up in my test facility (bath!) flame is going to be supplied by  my range of Seivert burners and I hope to establish the maximum size (kW) of burner required for full power to maintain boiler pressure.
While this is going on I shall be counting pump strokes from the hand pump (3/8 in bore) mounted in the hull - hopefully I can calculate the water consumption!
I think prior to this it might be prudent to carry out a hydraulic test of the boiler.
I am not sure if this is to an acknowledged design, it appears well made from 3/32 seamless copper both for the outer and inner shell with diagonal cross tubes all siver soldered together.
The Bassette Lowke gauge fitted reads full scale 60 psi? which would suggest a working pressure of 40? (seems low) any thoughts on test pressure?
I am trying to basically finish off the boat to a usable level and am trying to keep things simple!
17/12/2009 23:40:12
Alan, I must admit I had thought about condensing the exhaust for return, but at this stage of the project I was just trying to get the basics right (or about right!) to get it running again with a feed pump capable of delivering the correct(ish) amount of water.
Are there figures relating to gas burner output and steam production? I realise this would depend on boiler efficiency.
17/12/2009 23:00:48
Hi Les, Thanks for your input!
Your'e right this is at atmospheric pressure - my reasoning was that the water going into the boiler starts off at atmospheric and the final steam out of the exhaust is at atmospheric pressure?
But I think your right - I need some guidance!
17/12/2009 22:10:09
I think I am getting somewhere!
I have found out that water when turned into steam will expand about 1600 times - so 1cc of water when boiled will produce about 1600cc of steam.
I know my engine has two cylinders of 3/4 inch bore and stroke so I can determine the stroke of my feed pump when running via a worm drive (36:1) off the engine.
I will be allowing some sort of 'safety margin' so the pump will deliver more than I believe the engine is using, the excess could go to waste?
My question is, what sort of safety margin shall I allow, 50% seems a good starting point but it would be nice to know if this is considered 'about right'
15/12/2009 16:50:49
I have read Model Engineers Workshop for a long time but only just joined the 'forum'! and plant my first post!
I was recently having a rumage in the loft when I thought I would get my old steam boat out for a play. Built by my Dads uncle about 1950 I think.
It consists of an aluminium and ply hull about 4 foot long, powered by a paraffin fired copper water tube boiler - 5 inch diameter by 9 inches long with a 2 1/2 flue fitted with 8 water tubes and a superheater.
This feeds a Stuart Turner Sun engine and drives a single prop.
I can remember my Dad having this afloat at Victoria Park boating lake in London when I was a wee nipper. It used to go well but lacked any sort of control - set the rudder, open the steam valve and hope you, or some helpfull person would 'catch' it round the other side! all very nerve racking! Of course then the hand pump would be used frantically to replenish the boiler!
So, my current project consists of equiping the boiler with some sort of gas burner to enable more control (and perhaps a bit quieter), re mounting the engine horizontal and building a gear driven drive for a boiler feed pump I have, and here is my problem, I can't seem to find out what sort of water volume it should be pumping to maintain boiler water level. The Sun engine is a single acting twin of 3/4 bore and stroke.
Is there any tables which give a guide to steam (water) consumption for a given engine size? I realise that this would probably only be a guide, but a guide is better than not a clue!
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