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britannia boiler

blower on backhead

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David Bothwell 114/05/2022 15:26:46
188 forum posts

I have a three and a half inch gauge Britannia with a professionally made boiler. My question is I can.t understand the blower setup. I tried a rod into the backhead inlet and it hit the narrow part of the backhead. That is the lower left backhead inlet. The drawings show a pipe leading from the upper right backhead inlet. do I need to insert a tube (to the smokebox? )Any help gratefully received and acknowledged .

noel shelley14/05/2022 16:50:30
1347 forum posts
21 photos

I know nothing about this boiler BUT, A common way to feed steam to the blower is a hollow stay ! The hollow stay will have a valve on the backhead feed through the boiler to the smoke box then a blower jet or ring. The valve will be fed with live steam from often the manifold. Might give you a clue. Noel.

David Bothwell 114/05/2022 17:44:35
188 forum posts

Hello Noel, Thanks for the reply, I think I have worked out that the top right is where to place the hollow stay, what I cant understand is why this is not part of the construction process?

Nick Clarke 315/05/2022 09:47:09
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1427 forum posts
63 photos

Assuming the 'Brit' is the LBSC design, the description does give details of the blower arrangement, even if it is a little unusual. The 1/4" threaded hole on the lower left of the backhead is where the blower valve is mounted, however there is no steam access to it from the boiler here - it is purely a mounting. Steam for the blower is taken from the turret/manifold and from there to the hollow stay which is shown on the drawings and described in the text.

backhead.jpg

blower2.jpg

blower1.jpg

Edited By Nick Clarke 3 on 15/05/2022 09:49:38

David Bothwell 115/05/2022 15:33:40
188 forum posts

Hello Nick, I am most grateful for your reply, which clears things up!

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