I thought Brad would have the suction size answer! Suction size has been for some time based upon the pressure remaining above 0 psi when flowing at 150 percent of the rated capacity. So, 6" might be possible, but you'd have to verify the supply.
Agree completely, no concentric on suction side. Scott Office: (763) 425-1001 x 2 Cell: (612) 759-5556 -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Brad Casterline Sent: Thursday, February 11, 2016 4:08 PM To: [email protected] Subject: Re: NFPA 20 around 1988 No to concentric on suction side--- Requires ECCENTRIC, top flat. (if this is vertical in-line, different ballgame) On Feb 11, 2016 3:58 PM, "Travis Mack, SET" <[email protected]> wrote: > Was it ever permitted for a 1000 GPM pump to be supplied by 6" piping? > Also, was it ever permitted to put a CONCENTRIC 8x6 reducer on the > suction flange of a pump. > > We have an existing project where the owner was hoping to remove the > pump and to supply from city water. I informed them that the water > pressures on site were not compatible. They also have a pump that has > been requiring a lot of maintenance. As I looked at the as-built > plans (yeah, miraculously they had them for a building built in 1988), > it shows a 6" supply for the > 1000 gpm pump and the concentric reducer on the suction flange of the pump. > > In the most recent editions of NFPA 20, a 1000 gpm pump needs an 8" > suction line. > > -- > Travis Mack, SET > MFP Design, LLC > 2508 E Lodgepole Drive > Gilbert, AZ 85298 > 480-505-9271 > fax: 866-430-6107 > email:[email protected] > > http://www.mfpdesign.com > https://www.facebook.com/pages/MFP-Design-LLC/92218417692 > Send large files to us via: https://www.hightail.com/u/MFPDesign > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.org > _______________________________________________ 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
