[modeleng] Re: Blowing down

I agree.  I have blown down industrial boilers at only
15 psi on the gauge and it still raises quite a fuss.

Al Messer
--- alan Stepney <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
wrote:
> In my view, at only a few psi.
> All you need is sufficient pressure to blow out all
> the muck.
> 
> Alan
> 
> 
> ----- Original Message ----- 
> From: "Peter Sheppard" <peter.sheppard@xxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Wednesday, May 25, 2005 11:39 AM
> Subject: [modeleng] Blowing down
> 
> 
> 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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