Todd, What did you do to deserve such Karma? This guy will probably save them into a black money hole. Question: If they haven't run mains why do you get a 6" pipe when you only need 2 1/2"? Why have they hired you you if they're listening to they're amateur? The problem of the empty spot is real, I've seen it, and kudos to you for just suspecting the arrangement is bad. I think the long reducer (I'm seeing a giant underwriters' playpipe) will work but just how long? Maybe the same ratio as the playpipe but 6" to 2 1/2" instead of 2 1/2" to 1 1/8". The stepping with a straight pipe of sufficient diameters might also work. Why can't you just get a 4" UG?
On Tue, May 26, 2009 at 4:41 PM, Todd Williams <[email protected]> wrote: > That's the type of thing I am looking for. My original thought before > I posted this was a 6x4 90, the 10 diameters and a 4x2-1/.2 eccentric > reducer. Space may be an issue and when they run the underground > mains, I'll have to figure out the exact arrangement. This is a > church addition and the project is being run by the building > committee. One member deals with sprinklers a little bit at work and > has been thoroughly annoying. He is doing the layout for the tanks > and mains into the building (to save money). I'm trying to give input > as best I can, but I'm not sure what the final product will look like. > > > At 06:48 PM 5/26/2009, you wrote: >>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) > > Todd G. Williams, PE > Fire Protection Design/Consulting > Stonington, Connecticut > www.fpdc.com > 860.535.2080 > _______________________________________________ > 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) > -- Ron Greenman at home.... _______________________________________________ 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)
