When you open an FDV, water comes out, it's automatic. Manual standpipes, like in unheated parking garages with no water supply, just an FDC, are manual. Pump isn't undersized, assuming it serves HMD sprinkler requirements with hose stream allowances, just doesn't supply standpipe demand, FDC does. TD
-----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of very Cool Sent: Thursday, April 28, 2016 8:40 AM To: [email protected] Subject: RE: standpipe and sprinkler pressures Tom: That's a good point, even if the sprinkler booster pump is undersized for standpipe requirement, and only manual wet standpipe is required, would the standpipe be considered automatic wet in this case? For example, if the sprinkler booster pump is 500 GPM @ 70 PSI, and standpipe requires 1000 gpm @ 150 PSI in a combined system, would the standpipe be considered automatic in this case, or will the sprinkler booster pump need to become a fire pump with more flow and pressure to achieve 100% automatic operation? _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
