[modeleng] Re: Blowing down

Peter,

Some people say to wait till the boiler is at about 30 PSI before blowing
down.  In full size practice of course the boiler was blown down frequently
while running, but naturally they didn't blow it all the way down as we do.
Better get to blowing down every day no matter how much trouble it is to
fill the Hunslet.  There was a sectionalized boiler at Mid-South a few years
back and it was unbelievable how much crud was in there piled up in the
water legs and between the flues.  I don't know if it had never been blown
down or just not frequently enough, but that boiler was full of rusty
minerals.

Jesse

> I now have to engines that I can blow down.
>
> So far, the Hunslet ("The Widow" or "Lady Mari Jacqueline" to give her,
her
> full name!) has not been blown down for the simple reason that it is a
right
> pain to refill.
>
> Shirley (the Bagnall) has a super blow down system.  It is permanently
> plumbed from the blow down valve, through a shut off cock to a length of
> copper pipe that I also use to refill the boiler (it takes about 2 minutes
> to refill!)  [I plan to adopt the same system on The Widow at the end of
the
> season].
>
> The question is very simple, at what pressure do (or should you) you blow
> down from?  If you blow down from a too high a pressure can you put
thermal
> stresses on the boiler? (i.e. rapid cooling)
>
> Cheers
>
> Peter

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