NYC has a requirement for construction standpipes in all high-rises to be pressurized and monitored with a placard indicating required FDC pressures for required flows at each floor. Boston adopted this last year. Roadway standpipes are required to be timed for water delivery but are empty and have automatic air vents at the FDV’s. What’s the application requiring exhaust of standing air pressure? Is there a compressor connected and running? Horizontal or vertical installation?
TD Sidestep the issue. If you can, pull a slight vacuum on the standpipe instead of pressurizing it. On Feb 28, 2017, at 7:17 AM, Mike Stossel <[email protected] <mailto:[email protected]> > wrote: I am trying to calculate the time it will take for a 2-1/2” hose valve to relieve a standpipe system of air. I am designing a temporary standpipe system in NYC and the requirement is to fill the entire system with air and a single 2-1/2” hose valve needs to relieve the pressure within 3 minutes or a second will need to be added. My total system volume will be 1902 gallons and the staring air pressure will be at 18psi. Does anyone know of a way to calculate this? Thanks for the help. Mike Stossel SET
_______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
