Most DPV's that I'm aware of have the main drain below the wet seat.
Therefore allowing a main drain test without tripping the DPV.
-Bill
On 12/28/2012 8:49 AM, Todd Williams wrote:
Vince,
You may not find the 2" drain on the dry system worthless after a trip test and it
may be advantageous to pipe it to the outside wall (even if partially trapped). That
being said, from what my understanding is that the 2" drain test is to verify that
the valves are open and that by comparing results year over year, you can detect changes
in water supply. Those can be pretty much done from a test at the main riser , with the
exception of the valve for the dry system. The AHJ will probably be the determining
factor.
At 09:38 AM 12/28/2012, you wrote:
Good morning & Happy New Year!
A 2" main drain test is required for system acceptance.
We're installing a dry pipe valve downstream and
auxiliary to a wet system with an alarm valve and a 2" drain.
My question is , would a 2" main drain test from the existing wet
system stand for an acceptance test or do we have to find a way
to run a worthless 2" drain line from the new dry system (at an inside wall)
to an outside wall?
Thanks! Vince
Vince Sabolik, West Tech Fire Protection, Inc.
11351 Pearl Road / Strongsville, Ohio 44136 440 238-4800 Fax 440
238-4876
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, CT
860.535.2080
www.fpdc.com
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