Boiler Feed

This topic has 5 replies, 4 voices, and was last updated 30 October 2017 at 22:54 by John Billard 1.

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11 July 2017 at 22:19 #1623
RickyT
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@rickyt
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11 July 2017 at 22:19 #306769
RickyT
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@rickyt
I am building a 5 inch gauge Manor broadly to the Martin Evans design. It has the usual GWR top feed arrangement. Ideally I would like to have twin injectors plus a tender hand pump plus a crosshead pump. I am constrained however by only being able to run one pipe up each side of the boiler to the feed.

On the left hand side I have combined the tender hand pump with an injector.

That leaves me with the second injector and crosshead pump to think about. If I were to combine these two on the right hand I can see that the right hand injector would only have any chance of functioning if the locomotive (and therefore the crosshead pump) were stationary. That is fine. What concerns me more is the possibility of the crosshead pump forcing water back through the injector rather than into the boiler. Is this likely to be problem?

One alternative solution is to run the crosshead output over to the left hand side for a 3-way combination with the hand pump and left hand injector. But this may over-complicate things and compromise the operation of the left hand injector. It would at least give the right hand injector an untrammeled run to the top.

The simplest way out is to forget having twin injectors and simply connect the crosshead pump on the right hand side with just the remaining injector and tender pump,on the left.

Any wisdom on this dilemma gratefully received.
15 July 2017 at 19:58 #307309
Werner Schleidt
Participant
@wernerschleidt45161
Hallo Ricky,

if i had this layout you discribed i had the handpump and the crosshead pump on one side with check valves to the

boiler and the same on the other side. Two injectors separated by check valves.

So you have no problem by mechanical feed and even if only one of the two injectors is working you have a functioning loco. And i see no reason why not both injectors can work at the same time by such a layout.

Werner
15 July 2017 at 22:29 #307346
julian atkins
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@julianatkins58923
Hi Richard,

You have an unread PM

Cheers,

Julian
11 August 2017 at 22:12 #311546
RickyT
Participant
@rickyt
Apologies for pause in reply – I've been away for a while.

Many thanks both for your suggestions

Have decided to risk simply fitting two injectors, cross my fingers and reconfigure if it doesn't work out.
30 October 2017 at 22:54 #324553
John Billard 1
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@johnbillard1
Apologies for a delayed reply – I am catching up.

My Manor has one injector, the cross head pump and the tender hand pump. The hand pump feeds into a separate clack into the firebox below the cab foot boards, leaving the others into each top feed.

I never have to use the hand pump as the cross head pump correctly set will keep the water level up when passenger hauling all day; using the injector for topping up when the engine is stationary for a period.

With the Great Western design using the "vacuum" cross head pump to use water the advantage is that it is accessible and can be removed very quickly for maintenance.

My engine, originally built about 25 years ago by Ken Morris of Maidenhead, has run thousands of miles and remains a very reliable performer. I have not considered the need for a second injector.

With kind regards

John Billard
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