Thanks for the nod Scott. For horizontal split case centrifugal supplied by storage tank only, psig can actually drop below zero psi... How much? h=v^2/2g :) On Feb 11, 2016 4:16 PM, "Travis Mack, SET" <[email protected]> wrote:
> I have yet to get any pump test information, but I assume it has been > tested properly. > > Thanks for the confirmation of the reducers. I was pretty certain that > you couldn't use a concentric back in the day, but I didn't have the > standard to verify it. > > What's funny is the pump is 8x6. They ran a 6" underground and piping up > to the suction of the pump, then had to put an 8x6 flanged "increaser" to > match up with the pump. You would think that some one would have had the > idea back then that this didn't seem quite right. > > 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 > > On 2/11/2016 3:12 PM, Scott Futrell wrote: > >> 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 >> > > _______________________________________________ > 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
