Another option is to not run the pump at 150% Roland
On May 26, 2009, at 5:59 PM, Todd Williams wrote: > The pump is a 250 gpm; a minimum of 4" suction is required (OK, > 3-1/2). I did a project with the same size pump 2 years ago, taking > suction from 2 tanks with a 4" suction line. When we tested the pump > at 150%, we drew the suction down to -1 psi. There is going to be > more suction pipe on this than the last, so I told them to use 6" > because I was afraid that the suction would go below -3 psi at the > acceptance (per 5.14.3.2). So the 6" sizing was my doing for those > reasons. I provided the tank and suction pipe sizing and the rest of > the design is up to others. We also cannot increase the size of the > pump, as someone suggested because we only have single phase power > and 250 gpm at 60 psi is the largest we can get. > > I am now finishing up the final piping arrangement for the pump and > was questioning the reducer arrangement. _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
