2 zones popping on.

greenmonster304

LawnSite Platinum Member
Location
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i have this system we built a few years ago with I 90s. Each one has its own valve and is a zone. Lately when one zone is fired another will pop on for a few seconds to a minute. It happens randomly. It runs on a pump start with a submersible well. Runs at about 100 lbs. Any ideas?
 

benhargreaves

LawnSite Member
Location
South Dakota
What is the supply GPM from the pump and what is the GPM of the zone(s)?

I have a lake pump system where zones will randomly pop on when the pump first kicks in. It's also a pump start. Sometimes is will be 1 or 2 zones and they stay on for less than a minute. My working theory is that the first zone to come on isn't using enough water and the other valves are literally being pushed open by the excess supply from the pump. Haven't gotten around to testing my theory or running the numbers though.
 
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greenmonster304

greenmonster304

LawnSite Platinum Member
Location
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What is the supply GPM from the pump and what is the GPM of the zone(s)?

I have a lake pump system where zones will randomly pop on when the pump first kicks in. It's also a pump start. Sometimes is will be 1 or 2 zones and they stay on for less than a minute. My working theory is that the first zone to come on isn't using enough water and the other valves are literally being pushed open by the excess supply from the pump. Haven't gotten around to testing my theory or running the numbers though.
That is pretty much the same theory I have. Each head uses about 60 gpm I believe and the pump makes 85-90
 

stebs

LawnSite Senior Member
Location
Eastern KS
Why add a pressure tank when the system was built several years ago and has been fine til now? Is it the same zone that randomly pops on?
 
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greenmonster304

greenmonster304

LawnSite Platinum Member
Location
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Why add a pressure tank when the system was built several years ago and has been fine til now? Is it the same zone that randomly pops on?
Well truth be told he says it has always happened just never thought to mention. We noticed today while there fixing a leak
 

ArTurf

LawnSite Fanatic
Location
Ark
So a valve need pressure to shut off aka seal. So I'm thinking there's leak down when system isn't running and it takes a little time to fill lines and create enough pressure to shut off the valves that are not "on". Seen this often on pump systems
 

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