Posted by LarryT on February 15, 2012 at 17:39:52 from (107.4.52.32):
In Reply to: Well pumps question posted by Greg K on February 15, 2012 at 16:40:04:
Your right as the longest column of water you can lift at sea level is 31 feet. We are at 5250ft here and it's about 24-26ft. Kind of interesting that I just had to replace one of mine. The well is 350ft with a screen at 160 to 180 and another at 300 to 320. There is a 7hp 2" pump and guess what????? There is a check/foot valve 21 feet above the pump. The static head in the case is at 38 ft. but the pull down is about 20 feet above the pump. the pump is set at 150 ft. I get 80 gpm at 120 psi.
Dam, I am long winded. You can loose your column in a submersible without a foot/check valve. When the pump starts if there is a void in the column, you can get what they call a water hammer. It's very much like when you shut a valve off suddenly and you see the pipes jump and move around. But this kind can crater a pump. Use the check valve.
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