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Boiler bush sizes

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Barry Purchase18/03/2010 11:44:54
7 forum posts
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The drawing for the boiler shows the thread sizes for the Blowdown, Clack, Water glass bushes and fusible plug as 1/4" x 26 tpi. Commercial maufactured Clacks and Water Gauges are normaly 1/4" x 40tpi.
Is there any reason why they can not be 1/4" x 40 tpi?
 
Circlip18/03/2010 12:32:14
903 forum posts
Did the article go on to describe the boiler fittings?? At one time. only the rich could afford to BUY fittings, you only paid for taps and dies once. (Perviding you were careful)
 
  Regards  Ian.
nick feast19/03/2010 08:24:23
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74 forum posts
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Well done Barry, I'm just writing up the boiler article for ME right now and of course 40 tpi is what I should have drawn. I will have a bit to say about commercial clacks and how to make them work properly later on!
 
Regards
 
Nick
Barry Purchase19/03/2010 10:12:37
7 forum posts
1 photos
Thanks Nick. I will amend my copy of your boiler drawing. I think, also, that the dimension for the depth of the flanges is missing. I would think they are are about 10mm. Can you confirm.
 
Best Regards,
 
Barry
nick feast26/03/2010 13:57:13
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74 forum posts
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Hi Barry, the drawing shows all the flange dimensions on my copy, can you confirm which one is missing?
Thanks
Nick
Barry Purchase27/03/2010 20:56:53
7 forum posts
1 photos
Hi nick.
 
I have rev 2 of your drawings Q1-008-L006 and L007 as supplied by Polly and cannot find the flange depth for front tube plate, throatplate etc. Also fire hole is not dimensioned other than it being 24 long.
I'm having the boiler made for me, so may have more questions in the future.
 
Again, Many Thanks.
Barry.
nick feast12/04/2010 17:04:37
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74 forum posts
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Hi Barry,
Sorry to be slow replying, just checked and these dimensions are definitely missing. Obvious when its pointed out!
Boiler flange dimensions will be decided by the boilermaker, need to be just wide enough to make a sound joint. 6mm is enough, 8mm is ok.
I made the firehole oversize at 40mm od by 4mm wall, it could be smaller if you like, but bigger is easier to keep fed with coal.
Regards
Nick
Barry Purchase16/04/2010 06:16:11
7 forum posts
1 photos
Many Thanks Nick.
 
Barry.
Barry Purchase10/05/2010 19:45:53
7 forum posts
1 photos
Nick,
Sorry to be a pain, but on the steam pipe bush on front tubeplate,Drg Q1-008-L006 & L007, the dimensions are 18m dia with 4 holes 6BA on 13mm pcd. On the regulator assy drg, Q1-008-L008, they are shown as 22mm dia with holes on 15mm pcd. Can you confirm which are the correct dimensions.
22dia would seem to be the correct size.
 
Regards
Barry.
nick feast18/05/2010 10:51:53
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74 forum posts
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Barry,
Oops, sorry for that.  I made the first boiler with the 22mm bush and the second one with 18mm. If you make it 18 the bolt holes can break into the 'O' ring recess, so 22 is safer.
 
Best Regards
 
Nick
Barry Purchase18/05/2010 20:50:29
7 forum posts
1 photos
Nick,
Many thanks. I will amend my copy of the drawing.
Barry.

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