Yup that's exactly what happened. Swung the valve shut and instant water hammer. The fire Dept told me if any leaks showed up, is was my resposibility to repair them.
Water hammer is all about the velocity or speed of the water moving in the pipe. That's why the CSV eliminates water hammer from the pump, it slows the water down gradually before shutting the pump off. Think about water moving at 10 or 20 gallons per minute in a pipe, compared to water moving in the pipe at 1 gallon per minute.
sounds like you turned the valve to fast to cause the water hammer, where the gate valve would close it slow to not cause water hammer?
I'm thinking the last guy to work on this system didn't have a clue what the CSV was, and added the second pressure tank.
I am going to post some more videos on a CSV,Polly pipe, and if I come across steel pipe which is harder to find now days. Also When I go to a job with a good gpm pump with one check valve that I can test but I would like to see one tested with one check valve and 200'+ of drop pipe above the check valve for pump shut off water hammer, to show major pipe movement and how this will give short life to the check valve and your pump, I am sure this is why engineers want you to use multiple check valves in the well.
Quite the gauge needle jumping action at 1:13 and at the end. Pressure tank is in the house.Last test on multiple check valves in the well, then on to the next test.
No needle jumping.60psi in well CSV with buried tank system, what you would see between on/off and how it eliminates Water Hammer from pump start and pump stop.
I had trouble reading the Franklin Aid June 1984 scan initially. It was easier this way:Did you not read why multiple check valves get used?
This is awkward, but...
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