Water pre-heat question.

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cp4449
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Water pre-heat question.

Post by cp4449 » Mon Feb 05, 2018 3:53 pm

Has anyone done either:
A: Placed about 2-4 coils of feed water pipe inside the front of the smoke box, to preheat the water? If done, does the copper pipe hold up?
or
B: Used a closed steam line into the tender to heat the water before being sent to the boiler? (I would assume i one sits on the tender, you rear might get warm)

Thanks for any replies
C.P. Mahony
Apparently reinstated 1" Foreman
Los Angeles Live Steamers

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makinsmoke
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Re: Water pre-heat question.

Post by makinsmoke » Mon Feb 05, 2018 4:07 pm

Do NOT heat your water in the tender.

One of the reasons injectors won't lift is if they get too hot. A leaking boiler check valve is the usual culprit.

A friend had a return line to the tender that somehow got hot. The water in the tender got hot and the injectors quit working.

Tested by running cold water from a hose onto one injector. Once we figured that out, a hand into the tender weather revealed the source of the problem.

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makinsmoke
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Re: Water pre-heat question.

Post by makinsmoke » Mon Feb 05, 2018 4:08 pm

The Gene Allen design has a coil or two of copper line from the axle pump, around the inside of the smokebox to preheat the water before pumping into the boiler.

cp4449
Posts: 488
Joined: Tue Jun 06, 2006 10:54 am
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Re: Water pre-heat question.

Post by cp4449 » Mon Feb 05, 2018 4:59 pm

Then I will do the Gene Allen design. That seems safer, and easy to do.

Thanks
C.P. Mahony
Apparently reinstated 1" Foreman
Los Angeles Live Steamers

Pontiacguy1
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Re: Water pre-heat question.

Post by Pontiacguy1 » Mon Feb 05, 2018 5:22 pm

make sure your lines are out of the way, and also make sure they are easy to clean. they will get a lot of crap sticking to them and need to be cleaned pretty often. Also, you need to use copper on these or you won't be doing any good. I like to use stainless steel for my tubing inside of the smoke box, but a stainless steel feedwater heater would transfer so little heat as to be useless.

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Bill Shields
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Re: Water pre-heat question.

Post by Bill Shields » Mon Feb 05, 2018 5:34 pm

preheaters of this coil type, and one that I just removed from a loco that looked like a 'bed stead' are a mess to keep clean and take a real beating.

once you have one that works, make a spare and stick it in your tool box....

cp4449
Posts: 488
Joined: Tue Jun 06, 2006 10:54 am
Location: Granada Hills

Re: Water pre-heat question.

Post by cp4449 » Mon Feb 05, 2018 5:48 pm

How about three large coils around the inside of the smoke box walls, right near the door?
C.P. Mahony
Apparently reinstated 1" Foreman
Los Angeles Live Steamers

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Bill Shields
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Re: Water pre-heat question.

Post by Bill Shields » Mon Feb 05, 2018 9:45 pm

whatever you can fit and clean around is better than nothing.

how much better is to be determined.

Suggest you build it so that it can be removed easily...

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