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mysterypump
New Member
California
USA
4 Posts |
 Posted - Jul 24 2010 : 08:28:29 AM
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Hello,
I'm trying to determine the ID or at least HP of a mystery pump located in a well. I've been told that it is a Gould's pump and only a few years old. The DTW in the well is 300 feet, when the pump is producing 5 gpm the draw down is only a foot in the well. The pump can producer 5 gpm at a pressure of 48 psi at the pressure tank (which doesn't quite trip the shut-off). Using well charts from goulds (http://www.goulds.com/pdf/7310.pdf) I'm guessing that the pump is an 18GS20 (2 hp). Does this seem about right or am I missing some efficiency factor?
Thanks
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lkoops
Senior Member
Michigan
193 Posts |
Posted - Jul 24 2010 : 4:44:22 PM
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| Where is the water level in the well? The pump should make more pressure than 48 psi. There is either something wrong with the pump or its a high volume lower h.p. in which case it should be replaced. Properly sized sub. systems should be capable of making 80-90 psi. or more. |
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mysterypump
New Member
California
4 Posts |
Posted - Jul 24 2010 : 6:11:06 PM
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The static DTW in the well is 295 feet below top of casing; the water column is about 85 feet and the total well completion depth is about 380 feet.
I'm wondering if the pressure gauge is a little faulty. |
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lkoops
Senior Member
Michigan
193 Posts |
Posted - Jul 24 2010 : 11:48:21 PM
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| Its possible, A 18 gpm 2 hp pump seems like it would struggle at that depth (have to look at the pump curve to know for sure)Is there a control box somewhere? It should have the horsepower stamped on it. Also the local health dept. may have a well record of your well. |
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speedbump
admin
Riverview
Florida
6268 Posts |
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snake
Advanced Member
CA
135 Posts |
Posted - Jul 25 2010 : 12:51:13 PM
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I'm guessing DTW means Depth To Water, because he mentions static water.
Snake |
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snake
Advanced Member
CA
135 Posts |
Posted - Jul 25 2010 : 1:00:02 PM
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Why couldn't be a model 5GS10, oh I see it now, you are determining the model by the shutoff pressure... unfortunely those curves are for new pumps, and I'll bet yours isn't new, and I'll bet at one time it built up pressure enought to turn off the pressure switch.
Snake |
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mysterypump
New Member
California
4 Posts |
Posted - Jul 25 2010 : 6:27:15 PM
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I'm thinking that its age/upkeep are an issue too. It's getting the job done for now, but .....
Thanks for all the comments- It's confirming some of my thoughts; just seems like kinda the wrong pump for the well conditions
DTW is depth to water, and about 300 feet |
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snake
Advanced Member
CA
135 Posts |
Posted - Jul 26 2010 : 09:14:37 AM
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Well you won't know the pump model until you pull it, unless you contact the last pump man that put it in, he would have it in his logs.
Snake |
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speedbump
admin
Riverview
Florida
6268 Posts |
Posted - Jul 26 2010 : 09:15:30 AM
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Duh! I just drew a blank on that DTW and it was so easy. Brain Fart I guess!
A two horse 10 or 15 gpm would work, but it really has a lot to do with the drawdown of the well also. If it only makes 5 gpm, the 1.5hp 10 gpm would probably be more suited to that well.
Products and Pricing
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mysterypump
New Member
California
4 Posts |
Posted - Jul 26 2010 : 11:23:45 AM
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Thanks for all you help and ideas.
We'll probably stick with it for awhile and see if things continue to work OK. If not I know where to find replacements now.
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mystery pump
