Getting that kind of scour is rare and very dependent on available pressure. When is it supposed to be flushed? When it's installed, right? How does it, us? Who witnesses the pressure test, us? What If wide open, bagged or not, you can't achieve the 10 fps rate? I wrote #20 years ago about having pipe sections supplying sprinkler and fire stuff capped to keep out the debris but it went nowhere. Plumbing is always moving, albeit slow, but moving. Our's sits still and stagnant. Flushing is never a waste of water providing you don't go on for hours, 10 minutes really is fine (or until she cleans up). Flush your undergrounds every year when you test, I've gotten stuff from 3 blocks away but it's better than during the test. Flushing and laying of pipe really needs to be addressed and revised, especially for small sprinkler systems that never move large amounts of water. Thank you and goodnight, remember to tip your waitresses. George Church
We had a problem with our construction group wanting to allow a lower flow than the 10ft/s velocity in the lines saying that it was the maximum the system would flow, but they were only opening a single hydrant. We insisted and finally got them to get more hose monsters and flowed more hydrants to get a proper flush on the underground piping. The wording about the maximum is so that if you have a system that will flow 20ft/s in the line, then that is the rate you flush at to ensure that anything that could break loose and jamb up a sprinkler system has worked its way throught and out of the system and not during a fire when you need it. When the fire department is there and they need more water they are going to get it if it is to be had. Kevin Law, PE _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.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)
