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Old 02-11-2010, 06:25 PM   #16
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Originally Posted by dawktah View Post
Is the Grundfos a system I can purchase and install myself? Well is only 40 ft. deep.
Buy, yes. Install it. Not likely. Many drillers don't try them.

A 40 foot well likely has a screen, at least it would around here. Setting any pump in the screen is touchy.

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Old 02-11-2010, 08:44 PM   #17
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Originally Posted by Driller1 View Post
Buy, yes. Install it. Not likely. Many drillers don't try them.

A 40 foot well likely has a screen, at least it would around here. Setting any pump in the screen is touchy.
The reports says that at 40 ft. the layer is gravel. So does that mean there probably is some sort of screen? I will contact the driller again and see if they found paperwork.

How do you calculate the dynamic head?

--Chris
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Old 02-11-2010, 08:56 PM   #18
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Originally Posted by dawktah View Post
The reports says that at 40 ft. the layer is gravel. So does that mean there probably is some sort of screen? I will contact the driller again and see if they found paperwork.

How do you calculate the dynamic head?

--Chris
It will be on your well log. It could be static water level. (it is on ours) The screen information is there too or, it will say bedrock intake (no screen).

On a new well I use a water meter that goes down in the well and BEEPS when it hits water.
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Old 02-12-2010, 09:14 AM   #19
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Quote:
Originally Posted by Driller1 View Post
It will be on your well log. It could be static water level. (it is on ours) The screen information is there too or, it will say bedrock intake (no screen).

On a new well I use a water meter that goes down in the well and BEEPS when it hits water.


After looking on it is says:
  • Static Water Level 8 ft. (8 ft. should I be using this well?)
  • Screen
    • Length 2.0
    • Material SS
    • Diameter 4.0
    • Slot size .050
How do you calculated the dynamic head???

Last edited by ChrisDIY; 02-12-2010 at 09:29 AM.
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Old 02-12-2010, 11:21 AM   #20
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Quote:
Originally Posted by dawktah View Post
After looking on it is says:
  • Static Water Level 8 ft. (8 ft. should I be using this well?)
  • Screen
    • Length 2.0
    • Material SS
    • Diameter 4.0
    • Slot size .050
How do you calculated the dynamic head???
The well is fine. Some wells have a 0 static. They flow.

Not sure what you mean by "dynamic head".

Not crazy about the SS screen but, it is a personal preference. A SS screen will plug faster. At least around here.
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Old 02-12-2010, 12:36 PM   #21
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All this work was done by previous owner, I bought house in June of last year, and its been fun! In the Grundfos sizing guide you have to add:

Hmin = Static Head + System pressure + above grade elevation

Hmax = Dynamic Head + System Pressure + friction loss + above grade elevation

I have to decide how much I am willing to do, local driller says they run 1" or larger to the house and house the house has 3/4". So the company that drilled the well didn't do the plumbing so anything can be in the ground from well to the house. The driller that installed well installs the Grundfos, so I can just use contractor if I don't want to dig up and/or think I may have trouble getting it set at correct depth.

--Chris

Last edited by ChrisDIY; 02-12-2010 at 12:50 PM.
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Old 02-12-2010, 01:11 PM   #22
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Originally Posted by dawktah View Post
All this work was done by previous owner, I bought house in June of last year, and its been fun! In the Grundfos sizing guide you have to add:

Hmin = Static Head + System pressure + above grade elevation

Hmax = Dynamic Head + System Pressure + friction loss + above grade elevation

I have to decide how much I am willing to do, local driller says they run 1" or larger to the house and house the house has 3/4". So the company that drilled the well didn't do the plumbing so anything can be in the ground from well to the house. The driller that installed well installs the Grundfos, so I can just use contractor if I don't want to dig up and/or think I may have trouble getting it set at correct depth.

--Chris
Just set the pump at the same depth as the old pump. It is likely just 20 foot + the pitless pipe.

Is this a 5" PVC?? I see the screen is 4" but, sometimes we put the screens on the end of the casing rather than telescope with a K-pack.
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Old 02-13-2010, 11:25 AM   #23
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Constant pressure or variable speed or frequency pumps do not last long in many cases and are expensive to buy and even more expensive to repair. They run at up to 10,000 rpm.

All residential pumps are rated continuous duty meaning they are made to turm'em on and let them run until you shut off the water. It's the number of starts, on/off that kills motors.

A much better choice is a CSV (www.CycleStopValves.com) for less than a couple hundred dollars depending on what size you need, which is a small one in your case. They are nonelectric, install in the water line before the pressure tank and allow the use of very small pressure tanks but...

You have a 4" well with roughly .5 gals/ft of water from the static water level in the well down to the inlet of the pump. IOWs very little storage in the well, so you must know the recovery rate of the well TODAY, not years ago based on what is on a well driller's years old log. 40'- 10' to set the pump 10' off the bottom if the screen is at that level - 8' static gives you 22' *.5 gals = 11 gals in storage; or at 22 gpm, 30 seconds worth. Meaning that at best after 30 seconds all 22 gpm must enter the well through the screen. Based on the hardness of the water and any bacteria, that type of flow in a 4" screen can scale it closed in a short period of time.

I seriously doubt your shallow 40' deep screened well will produce the volume of water you want, 22 gpm, for say 15- 20 minutes plus all other water used at the same time. Or the desired irrigation system.

You need a pump guy or well driller to come out and test the draw down and recovery rate of this well before you do anything else. A camera inspection to locate and check the condition and size would be a very good idea.

The next thing that is critical is the size of your softener and any other water treatment equipment. Your present softener is not sized to treat this 22+ gpm. That 22+ gpm would require a 4.0 cuft or larger softener.
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Last edited by Scuba_Dave; 02-19-2010 at 02:06 PM. Reason: removed comment about Driller1
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Old 02-13-2010, 12:48 PM   #24
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By the way, I know what dynamic head meant to me. Just wondered what it meant to the OP.

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Old 02-13-2010, 01:00 PM   #25
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BTW, a screen in a water well has nothing to do with the amount of water it produces. We have drilled many that has a screen and produces 80 GPM. And more.
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Old 02-13-2010, 01:02 PM   #26
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Quote:
Originally Posted by Gary Slusser View Post
Constant pressure or variable speed or frequency pumps do not last long in many cases and are expensive to buy and even more expensive to repair. They run at up to 10,000 rpm.

All residential pumps are rated continuous duty meaning they are made to turm'em on and let them run until you shut off the water. It's the number of starts, on/off that kills motors.

A much better choice is a CSV (www.CycleStopValves.com) for less than a couple hundred dollars depending on what size you need, which is a small one in your case. They are nonelectric, install in the water line before the pressure tank and allow the use of very small pressure tanks but...

You have a 4" well with roughly .5 gals/ft of water from the static water level in the well down to the inlet of the pump. IOWs very little storage in the well, so you must know the recovery rate of the well TODAY, not years ago based on what is on a well driller's years old log. 40'- 10' to set the pump 10' off the bottom if the screen is at that level - 8' static gives you 22' *.5 gals = 11 gals in storage; or at 22 gpm, 30 seconds worth. Meaning that at best after 30 seconds all 22 gpm must enter the well through the screen. Based on the hardness of the water and any bacteria, that type of flow in a 4" screen can scale it closed in a short period of time.

I seriously doubt your shallow 40' deep screened well will produce the volume of water you want, 22 gpm, for say 15- 20 minutes plus all other water used at the same time. Or the desired irrigation system.

You need a pump guy or well driller to come out and test the draw down and recovery rate of this well before you do anything else. A camera inspection to locate and check the condition and size would be a very good idea.

The next thing that is critical is the size of your softener and any other water treatment equipment. Your present softener is not sized to treat this 22+ gpm. That 22+ gpm would require a 4.0 cuft or larger softener.
How do you know it is a 4 inch??? The screen is 4 inch.
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Old 02-13-2010, 01:34 PM   #27
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2132010143013[1].pdf

Note this well produces 80 GPM, with a screen.
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Old 02-13-2010, 03:53 PM   #28
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2132010164742[1].pdf

34 foot with a screen. 300 GPM.

I have drilled wells that flow 200 GPM with a screen. The screen has NO effect on production. When the well is new.

Last edited by user69544; 02-13-2010 at 04:39 PM.
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Old 02-13-2010, 04:20 PM   #29
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I was a little concerned about that myself as I asked twice...

Quote:
Originally Posted by Driller1 View Post
The well is fine. Some wells have a 0 static. They flow.

Not sure what you mean by "dynamic head".

Not crazy about the SS screen but, it is a personal preference. A SS screen will plug faster. At least around here.
Quote:
Originally Posted by Gary Slusser View Post
I seriously doubt your shallow 40' deep screened well will produce the volume of water you want, 22 gpm, for say 15- 20 minutes plus all other water used at the same time. Or the desired irrigation system.
The well report clearly states in 2002 the well produced 75 gpm for 1 hour! Sure it can produce less gpm eight years later but more than a 2/3 loss? I live in a rural area and in/on a watershed.

Last edited by ChrisDIY; 02-13-2010 at 04:24 PM.
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Old 02-13-2010, 04:38 PM   #30
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I was a little concerned about that myself as I asked twice...





The well report clearly states in 2002 the well produced 75 gpm for 1 hour! Sure it can produce less gpm eight years later but more than a 2/3 loss? I live in a rural area and in/on a watershed.
The only reason it would change is the screen starting to plug. A SS screen will plug. So will plastic, just not as bad or quick.

In fact the guys that put SS screens in wells around here call them "job security".

There is more water flow in some areas with SS.


Last edited by user69544; 02-13-2010 at 04:40 PM.
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