Hot water pump and coolers

[nw-mailing-list at nwhs.org]

Dave,
	I'm not real sure of the exact reference here but I believe you are
referring to the coils used to cool the compressed air from the air pumps.
When compressed, the air gets quite hot and is very heavy with moisture.
Using the coils to extract the heat caused the water to condense so it could
be removed  before it got into the brake lines.  Water in a brake line can
cause brake failure.
	As to the hot water pumps, I am not familiar with them and have not
seen any documentation to their use, unless you are referring to the
injectors?  But this would be unheated water directly from the tender.  I
have heard that on some engines, hot water was circulated into the tender to
prevent freezing of the supply in cold weather but I have never seen this
actually documented.

	Harry Wilkins


> -----Original Message-----

> From: nw-mailing-list-bounces at nwhs.org 

> [mailto:nw-mailing-list-bounces at nwhs.org] On Behalf Of 

> nw-mailing-list at nwhs.org

> Sent: Monday, July 10, 2006 9:18 PM

> To: nw-mailing-list at nwhs.org

> 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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