If I had to I’d go back to first principles.

The main drain has two functions. 

A high flow, that should be fixed in configuration, to test water system supply.

And to drain the system to work on the system, or drain after a head opens.

Is it possible to split these functions?

Best.

Bruce Verhei 

> On Feb 22, 2018, at 12:29, Brian Harris <bhar...@bvssystemsinc.com> wrote:
> 
> Any suggestions on draining a system located in a basement below grade?
> 
> Brian Harris, CET
> BVS Systems Inc.
> Design Manager
> bvssystemsinc.com<http://bvssystemsinc.com/>
> Phone: 704.896.9989
> Fax: 704.896.1935
> 
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