In this day and age of digital everything it’s surprising that someone doesn’t sell a hydro pump set up with any auto shut off, with a standard 205 psig and select, with relief at 210 psig.
Best. Bruce V. > On 04/16/2021 4:12 PM Tom Duross via Sprinklerforum > <sprinklerforum@lists.firesprinkler.org> wrote: > > > Thanks Matt. > I also got a tip to buy/rent a large pressure washer today. I'm thinking > this little 3/4 hp Reed is not going to do it at all. > I did 800' of 8" ductile today, flush, pressure test, forward flow test. It > was 32° and snowing just north of Boston at this University. Took me 1 hr. > 10 mins. to pump from 66 to 210. It held fine but I got to thinking (during > the 2 hr. rest) that just one of these roadway #502 standpipes are 2300' > long, all 6" except the risers to the gated wye's and air releases every > 275' and a drop at each end to a 5" Storz and Vic717R. I doubt I will have > much free use of the local FD's pumper, I'm told they're not too happy about > having to do it. Kind of like the power company putting panels on your roof > with no rental but have to provide access. I'll know more next week. I'm > writing up test procedures over the weekend to coincide with #25 and #502, > and then some. Haven't done a roadway system in a few years but it looks > like 5 AM Saturdays for 5 weeks and the bridges are in use, never closed. I > gotta see what's out there for rentals. Going to use Scott's math to see > what the street fill will take and then the pressure pump-up. Thanks Scott, > we'll do pizza again next time your in town. Hey Scott, I got 10 minutes to > show a full stream after pulling the trigger on 150#, starting empty, think > I'll make it? > > > It might not be a real fast approach, but is there some reason that you > could not have the standpipes pressurized to 200 psi before the inspector > arrives? We frequently hook up the test pump and then go about > moving-off/cleaning up until the little pump reaches the pressure. If you > don't have enough time to get it pumped before the inspector comes (ask for > an afternoon appointment?) - we have pumped the systems up partially the day > before so that they are close to the test pressure but not excessively high. > Then you don't need as long to top them off. Just be sure you have a > helper/day laborer keep an eye on the gauge! > > I suppose it would just depend on how much big pump rental or nitrogen tanks > would cost VS a couple hours of small pump babysitting. > > Matt > > > Fill completely with water; then connect a high-pressure nitrogen cylinder > and quickly jack the system to 200 psi. Have seen this method used before to > test large warehouse systems where it is very time consuming to pressurize > the system(s). > > > > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
