[Steam-engine] heating surface

[JEFF LUND]

You need to calculate the square footage from the top
of the grates to the last tube before the chimney.
Then you need to multiply the square feet by 5.  This
will tell you the minimum pounds of steam per hour. 
This is referenced out of the NBIC section on
historical boilers.  This is a minimum and should size
your releif valve slightly larger than this. 
Excessively large  capacity is not recommended by ASME
sec I.  This is because it causes priming.

I hope this helps.

Jeff Lund
Lund Machine Works
New Ulm MN


--- Andy glines <pioneersop96 at yahoo.com> wrote:

> I need to calculate the heating surface of my boiler
> so that the safety valve can be properly sized.  I
> have a Huber return flue boiler that does not have a
> traditional firebox.  Do I include the entire
> surface
> area of the fire flue?  How about the front
> tubesheet?
>  How do to calculate a locomotive boiler
> differently?
> 
> =====
> Andy Glines
> Evansville, IN
> 
> 
> 		
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