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Allchin

Building the boiler

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RICHARD CALLIS27/09/2019 13:44:08
3 forum posts

In the 2018 boiler guide it states that either the water gauge or injector can be fed from the manifold but not both. Has anyone overcome this.

Cheers

Richard

Paul Lousick27/09/2019 13:58:02
1186 forum posts
498 photos

The Australian code for model steel boilers states that the water gauge shall be connected to the boiler independent of all other fittings, including the steam manifold. Reason being that any take-off of steam to a fitting attached to the water gauge will lower the pressure and will give a false reading in the gauge.

Paul.

tractionengine4227/09/2019 15:05:59
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362 forum posts
104 photos
Posted by RICHARD CALLIS on 27/09/2019 13:44:08:

In the 2018 boiler guide it states that either the water gauge or injector can be fed from the manifold but not both. Has anyone overcome this.

Cheers

Richard

I've built a 3" Allchin with a steel boiler.

I fitted a plug between the two ports on the manifold, then ran a pipe from the boiler to the other end of the manifold so that the manifold is fed from both sides and each side only feeds one outlet.

My boiler has two ports under the crankshaft, I used one of these, I fitted a custom low profile elbow to it and ran the pipe under the gears and up to the manifold, it's a bit tight but easy enough to find a route that does not clash with anything moving. I used 1/4" pipe.

If you're building a 1-1/2" with a copper boiler then maybe you can add a threaded bush to the top of the boiler in a suitable location.

Nigel

Edited By tractionengine42 on 27/09/2019 15:29:55

3404627/09/2019 16:11:12
760 forum posts
4 photos

Try Station Road Steam archive - plenty of pictures there of the boiler backhead.

The water gauges all seem to be on the L H side and on two seperate bushes for WG only, one above the other.

Cannot see any connected to the manifold.

Hope this helps.

Bill

Edited By 34046 on 27/09/2019 16:11:51

RICHARD CALLIS30/09/2019 19:14:52
3 forum posts

I would like to thank everyone for get back to me with their comments.

My next stage is to split the manifold and at the forecoming model show look at finished models to find a point in the boiler top where I can fit an extra bush.

I will update you when I have the answer

Cheers

Richard

JasonB30/09/2019 19:39:38
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16411 forum posts
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1 articles

Bill, you must be looking at different engines to me. The first three on station road steam all have the water gauge, injector feed, water lifter feed and pressure gauge all off the same manifold as per the drawings.

Richard, at the end of the day it will be your boiler inspector who will have the final say so talk through any solution swith him before cutting metal.

JasonB30/09/2019 19:53:52
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16411 forum posts
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This photo shows the manifold that fixes to a pad on the top of the boiler so all 4 items are off the manifold

manifold.jpg

One option may to enlarge the front left fixing hole and use a banjo type fitting and run a short length of pipe from that to the top of the water gauge. Though check clearance to gears.

Edited By JasonB on 30/09/2019 19:56:12

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