Riser has been sitting for an hour. Does gauge read higher than immediately after test? Is system configuration cause substantial trapping of air?
If so, maybe municipal supply has considerable pressure surges. The air is being compressed over an hour. When single inspectors test opened compressed air provides impetus for flow until pressure drops below current pressure in municipal main. If you’ve ever lived off a single family well the (bladdered) pressure tank acts exactly the same to prevent the pump turning on at each small flow. Best. Bruce Verhei > On 10/06/2023 1:41 PM PDT [email protected] wrote: > > > > preparing for an inspection, i have 4 risers. 2 of them are 6” pipes and the > flow switches work perfectly. 2 of them are 8” pipes and not working as > smoothly. first test, it will take 25 seconds for the flow switch to > activate. 2nd and 3rd test, less than 5 seconds and they activate. after > waiting an hour, the first test will go back to 25 seconds to activate. > immediately after this first test, goes back to 5 seconds. any thoughts on > why this is happening? need to get this corrected so we can set these > accordingly to pass an inspection. i know after they activate, we have > settings for how long until it will set off the alarm. that’s not the issue. > the issue is the time frame for the switch to move when we open up the > inspector test. > > any insight would be appreciated. > > > > > _________________________________________________________ > SprinklerForum mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to [email protected] >
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