I think you might have problems Todd. A pump off an aboveground tank I did at a Loews 2 years ago developed "catching-up" issues. We were transferring from normal to emergency and during the switchover the supply bottomed out on start-up. We had transferred after switch-over but when the pump came up to speed, the main dropped to vacuum at the suction of the pump. I had a -30/30 gauge on the suction and she went from 4 PSI to -5 (I think) for about 30 seconds until the supply came back. They had run a 10" right to the pump and put in 2 eccentrics, 10x8 and 8x6 to the 6" inlet. I remember it had a 10" bypass with the jockey off either side and the jockey controller showed pressure while we took a dive. I'm kind of ham and eggs to the science end of it but I think if you could reduce once, 10 diameters, reduce again, 10 diameters, you might avoid this. Maybe something else but it was a surprise fer sure.
Go Red Sox!! Anybody ever have a problem going with this dramatic a reduction? At 02:17 PM 5/26/2009, you wrote: >Todd, > >Can you use a Victaulic #51 6" x 2 1/2" groove eccentric and connect to >flanges using vic flanges? > >Jim Johnston, P.E. >Fire Protection Engineer > >I have a situation where a 6" main from a tank is going to need to be >connected to a 2-1/2" suction flange on a pump. The largest eccentric >reducer I can get is 4 x 2-1/2. Can I back-to-back reducers without >causing problems? Could I used a 6x4 90 on the suction line and then >elbow back to the pump (with at least the minimum distance reqd)? Any >other thoughts? > >Todd G. Williams, PE _______________________________________________ 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)
