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Selecting a size of boiler to a marine steam engine of known size..

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Jens Eirik Skogstad25/12/2009 08:36:08
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Hi all folks!
 
I has a twin cylinder double acting steam engine, the bore are 1/2" and stroke 5/8" (12.7 mm x 14.7 mm). Working pressure are 29-44 PSI (2-3 Bar).
 
How can i find the right size of boiler from smallest to biggest in this range adapted for a steam engine where the cylinder volume are known?
 
Are there some calculation to find the size of steam boiler when the cylinder volume are known?
 
Merry Christmas and Happy new year to all folks in forum!
Circlip25/12/2009 10:00:16
1723 forum posts
And a very Merry Christmas to you too Jens Eirik. It's a bit late for a Christmas present, but a book which falls into your requirement is "Model Boilers and Boilermaking" by K.N.Harris. Not only does it give a full explanation of how to size a boiler but shows the construction of various types.
 
   Best  Regards  Ian.
Jens Eirik Skogstad25/12/2009 19:49:43
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Thanks, i am trying to seek after the book "Model Boilers and Boilermaking" and buy/bid if the book are in Ebay.
AndyB26/12/2009 11:54:02
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Season's Greetings to everyone.
 
Jens,
 
Try Amazon, the UK site has several for sale
Circlip26/12/2009 13:01:23
1723 forum posts
Jens, you should be paying NO MORE than £14.99 for a NEW copy of the book.
 
       http://www.teepublishing.co.uk/search.php   and http://www.camdenmin.co.uk/have them. Had there been any current Model engineering Exhibitions, you could have probably bought it cheaper.
 
   Regards  Ian.

Edited By Circlip on 26/12/2009 13:04:24

Edited By Circlip on 26/12/2009 13:08:45

Edited By Circlip on 26/12/2009 13:10:57

Edited By Circlip on 26/12/2009 13:12:23

Jens Eirik Skogstad26/12/2009 23:52:37
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A lot of thanks! There are really cheap books
 
I has a question about the boiler:
 
The time steam boiler will give steam quantity in a time period determined by the amount of water?
 
Vapor pressure is determined by the heating effect provided by the burner or the size of heating surface?
 
Are this correct?
 
 
Circlip27/12/2009 10:50:37
1723 forum posts
Jens, your command of English is far better than my command of your native language, but to answer what I think you have asked :-
 
  A given content of water in any boiler is capable of generating a certain volume of steam. The way to increase the volume of steam is to feed the boiler while it is operating, with more water to compensate for that which is evaporated. You do this by adding a boiler feed pump which can be operated manually or coupled to the engine but needs to be controlled within limits so that not too much OR too little is fed in.
 
  Vapour (Steam) pressure is controlled by burner heat and also heating surface which are determined by  the evaporative rate of a boiler, but the design of the boiler controls the efficiency of the heating surface.
 
  DON'T stop asking questions, but it will become a lot clearer when you see the book mentioned. K.N. gives worked examples of how to "Size" a boiler for the engines requirements and also the different DESIGNS of boiler for different applications.
 
   There are times when you want to tear your hair out with the course you have chosen to amuse yourself with, but it IS worth it in the end.
 
   Regards  Ian. 

Edited By Circlip on 27/12/2009 10:52:00

Alan Worland28/12/2009 22:12:51
247 forum posts
21 photos
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.
Circlip29/12/2009 14:14:48
1723 forum posts
I'd be surprised if you couldn't Alan, only about thirteen different designs in it.
 
   Regards  Ian.
 
  An if the guy I LENT my copy to is reading this, can he let me have it back, with the other three he BORROWED. 
Ian S C30/12/2009 07:06:01
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Hi Ian he proberbly sold them on Ebay,Alan might have just bought it!Ian S C
Steve White23/03/2010 23:13:00
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2 photos
Hi there,
further to answers received on this topic, similarly, does anybody know how to correctly size the engine to the hull or vice versa (and prop)? 
 
after making a few live steam locomotives, I have a yeaning to build a model steam powered boat of some description, I fancy an Edwardian steam yacht and envisage sedate speed rather than planing!
Any ideas on sources for suitable boat plans?
 
Many thanks
Steve
David Clark 124/03/2010 10:25:57
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3357 forum posts
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10 articles
Hi There
Martin Ranson is starting a series on a steam power plant in ME4375.
Try the www.myhobbystore.co.uk website for plans.
regards David
 

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