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?
> From: [email protected] > To: [email protected] > Subject: RE: standpipe and sprinkler pressures > Date: Thu, 28 Apr 2016 08:27:07 -0400 > > If your using 175 class fittings and hydrostatic testing to 200 then you > can't pump in more than 150. You have to base your standpipe hydraulics at > 150 psi max from the pumper at the FDC. > You said combination so your standpipe is automatic, fire pump serves > sprinklers only, fine, FDC serves to supplement standpipes from whatever to > 100 at 500-750-1000. > Tom > > Ben, > > I always do whatever it takes in sizing the standpipe mains to keep the > pressure below 175 (I usually shoot for 150 to 155). It may mean that you > run more 6" bulk and maybe even 8" to the first standpipe. If you do this, > you can stay away from PRV's or 'high pressure' valves/ftgs, etc. > > Cliff Whitfield, SET > President > Fire Design, Inc. > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
