At Q=1000, V=11.5FPS and F=.025psi/ft, so 100 feet of suction line on a 24' high tank would be ok. At Q=1500, V=17.0 FPS and F =.052psi/ft, so 100' of suction line would go below 0 with less than a full tank. Mark at Aero 602 820-7894
-----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Travis Mack, SET Sent: Thursday, February 11, 2016 3:41 PM To: [email protected] Subject: Re: NFPA 20 around 1988 Even if the increaser is technically OK, the 6" suction pipe could be a problem. I haven't calc'd it yet, but that may put the velocity in excess of 15 fps for the suction piping. I'm pretty certain they are going to replace the pump and just upsize the suction piping for the 10 pipe diameters to be in compliance with NFPA 20 current edition. 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 3:35 PM, [email protected] wrote: > Then technically that makes the "6x8 Increaser" okay doesn't it? > Mark at Aero > 602 820-7894 > > -----Original Message----- > From: Sprinklerforum > [mailto:[email protected]] On Behalf Of > Travis Mack, SET > Sent: Thursday, February 11, 2016 3:16 PM > To: [email protected] > Subject: Re: NFPA 20 around 1988 > > 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-firesprin >>> k >>> l >>> er.org >>> >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprink >> l er.org _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprink >> l >> er.org > _______________________________________________ > 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-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
