Dry Pipe Valve - Main Drain for full flow?
Dry Pipe Valve - Main Drain for full flow?
(OP)
Hello Forum,
In a case where you have a 4" dry pipe valve on an upper level of a building and the 2" 'Main Drain' discharges into a 4" floor drain, does this floor drain need to take a full flow test or is the 2" drain simply for system drainage purposes. If I had a standard wet sectional valve, my drain assembly would have provisions for testing my alarm initiating device and also a full bore drain assembly for emptying the system. Is the drain on the dry pipe system valve considered a 'Main Drain' in terms of conducting a 'Main Drain' test for measuring pressure drop under flow conditions?
Thanks! JLC
In a case where you have a 4" dry pipe valve on an upper level of a building and the 2" 'Main Drain' discharges into a 4" floor drain, does this floor drain need to take a full flow test or is the 2" drain simply for system drainage purposes. If I had a standard wet sectional valve, my drain assembly would have provisions for testing my alarm initiating device and also a full bore drain assembly for emptying the system. Is the drain on the dry pipe system valve considered a 'Main Drain' in terms of conducting a 'Main Drain' test for measuring pressure drop under flow conditions?
Thanks! JLC





RE: Dry Pipe Valve - Main Drain for full flow?
RE: Dry Pipe Valve - Main Drain for full flow?
I would say yes required for the annual main drain test.
Yes should be piped to outside or legally piped to a drain that can handle the wide open valve
RE: Dry Pipe Valve - Main Drain for full flow?
RE: Dry Pipe Valve - Main Drain for full flow?
Is this just a general question or actual system you are looking at?
Not near the book, but you need a drain for each system.
And would have to see how the main drain test requirement reads
RE: Dry Pipe Valve - Main Drain for full flow?
RE: Dry Pipe Valve - Main Drain for full flow?
Suggest direct connection designed to the plumbing code for direct connection
RE: Dry Pipe Valve - Main Drain for full flow?