Hot water pump and coolers

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Worthington SA Feedwater Heater Systems consisted of a cold water pump, a 
heater unit, and a hot water pump.  The cold water pump (turbine) supplied 
water to the heater unit ahead of the smokestack, after which the hot water 
pump (reciprocating) pumped it through the check valve into the boiler.

When air comes out of an air pump it is hot.  Engines were provided with 
coils or loops of piping between the air pump and the air reservoirs to cool 
it; later, after coolers such as the Wilson seen on many class A engines did 
the trick.  After it was cooled, it was easy to remove water which may have 
been condensed with the air.

Ed King
----- Original Message ----- 
From: <nw-mailing-list at nwhs.org>
To: <nw-mailing-list at nwhs.org>
Sent: Monday, July 10, 2006 10:18 PM
Subject: Hot water pump and coolers



> Veterans,

>

> What is the purpose for a 'hot water pump' on a steam locomotive?  Pumping

> from where to where?

>

> Also, what is the purpose for a 'cooler' or 'after cooler'? I presume it's

> to cool water (or steam), but why?

>

> Thanks,

> Dave Willis

> N&W Steam lives on in Indiana.

>

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