Nevertheless as Justin said the top of the bowls is where the water leaves the pump and assuming the water line at that point is your source you'll have zero supply and need to include the elevation below the flange, the turn at the flange and the pump housing down to the bowls in your calculation. I believe that the housing is manufactured such that the shaft does not contribute to the losses. Of course if you tell your pump guy your numbers at the flange and how far dbelow that the top of the bowls are he'll do the magic for you.
On 2/28/08, Dyce Geoffrey H. <[EMAIL PROTECTED]> wrote: > Thanks Justin. Actually, it's a below ground 30,000 gal tank with the pump > sucking the water up and out. > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Justin Reid > Sent: Thursday, February 28, 2008 4:35 PM > To: [email protected] > > Subject: RE: (no subject) > > When doing vertical turbine calcs, I have given my pump a dummy source, > such as a 5 foot long 10" diameter pipe and then run this through the > pump curve in the calculation software. My source is zero pressure and > flow so all pressure and flow at the discharge of the pump is a result > of the pump curve that I input. > > Keep in mind that your pump discharge elevation is actually at about the > top of the bowls. What looks like the "discharge flange" for a vertical > turbine pump is actually just a 90 degree turn for where the water > enters your piping above your tank or reservoir. I believe the rated > capacity of vertical turbine pumps is assuming a drained tank with the > water level just above the bowls; so, if your water level is any higher > than this, you will have a higher discharge pressure than shown on the > pump rating. > > Justin D. Reid, P.E. > Project Engineer > RLH Fire Protection > 3430 Unicorn Road > Bakersfield, CA 93308 > Office: (661) 410-1350 > Cell: (213) 798-0251 > Fax: (661) 322-6816 > [EMAIL PROTECTED] > > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Dyce > Geoffrey H. > Sent: Thursday, February 28, 2008 12:56 PM > To: [email protected] > Subject: (no subject) > > I am becoming very lazy in my old age and should know this answer. > Using a vertical shaft pump, is it acceptable to begin my calcs at the > pump discharge. For example...a 1000 gpm pump at 100 lbs. My source > node will be 1000 at 100 psi. Any problem doing this?? > Thanks in advance. > > > Geoffrey H. Dyce > > Sales Manager > > Industrial Fire & Safety > > 12075-34th St N, Unit A > > St. Petersburg, Fl 33716 > > Ph: 727-573-1556 > > Fx: 727-572-7266 > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email > to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) > -- Ron Greenman at home.... _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
