One method is: Put the FDC check in the building. Put a ball drip out  
at the FDC, below frost, wrapped in drain cloth, in a gravel drain  
field with a standard pyramid box over the ball drip location. Make  
sure grade is not sloping into the pyramid box.

Allan Seidel
St. Louis, MO

On Nov 12, 2009, at 9:01 AM, Gobeli, Paul wrote:

> Forum,
>
>
>
> What is the correct configuration to design and install a free  
> standing
> FDC that is drained properly for a building without a basement?  Does
> the portion of piping below grade need to be drainable even though  
> it is
> below the frost line?  A ball drip needs to be installed such that it
> can be determined whether or not the FDC check valve inside the  
> building
> is functioning correctly.  An additional drain of some type must be
> installed below the frost line to drain the vertical barrel of the FDC
> just like on a fire hydrant.  I do not believe that this must entirely
> drain the below grade FDC piping, just the piping above the frost  
> line.
> Does a vault need to be installed for a ball drip on the underground
> portion of this pipe or just a proper drain field?  How is this done  
> in
> industry?
>
>
>
> Thank you,
>
>
>
>
>
> Paul Gobeli, CET
>
> Fire Protection System Designer
>
> Minneapolis - St. Paul Office
>
> Burns & McDonnell  ::  Engineering  ::  Architecture
>
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>
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