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#1
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anyone know of an auto-variable output sump pump arrangement?
(numbers very rough. I didn't have a tape measure...)
We've got a typical sump pit, more or less two feet in diameter and three feet deep. The standard corrugated plastic deal that kind of looks like an upside down garbage can. There's a 3/4 or so horsepower (HP) submersible cast iron pump sitting at the bottom with a float switch that has more or less six inches of travel. Earlier tonight the switch stayed "closed" (that is, "on") despite there being no water flowing. Fortunately I heard it before any damage to the pump. I got to it, moved the float up and down a couple of dozen times to free it, and things are ok for now. But it got me thinking: a: any suggestions for lubricant that would reduce the chances of this happening again? b: and... that 3/4 HP is way more than needed most of the time. Even in the worst of rains we could probably manage with less than half that, and more typically it's a 10 seconds on, two minutes off, kind of deal. So... I was wondering if there's an automatic variable output sump pump out there that anyone's heard of. The way I envision it is that if the water is six inches off the bottom, the pump would run at 0.1 HP. At ten inches it would ramp up to 0.5. At 24 inches it would switch to the full 1 HP output. (Numbers for illustration). So yeah, it would need multiple sensors or a funky float arrangement or something. I can visualize lots of ways of designing something like this, but I was wondering if such a beast was available off the shelf. Thanks for any suggestions. __________________________________________________ ___ Knowledge may be power, but communications is the key [to foil spammers, my address has been double rot-13 encoded] |
#2
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anyone know of an auto-variable output sump pump arrangement?
On Wed, 4 Dec 2019 00:19:37 -0500, danny burstein
wrote: (numbers very rough. I didn't have a tape measure...) We've got a typical sump pit, more or less two feet in diameter and three feet deep. The standard corrugated plastic deal that kind of looks like an upside down garbage can. There's a 3/4 or so horsepower (HP) submersible cast iron pump sitting at the bottom with a float switch that has more or less six inches of travel. Earlier tonight the switch stayed "closed" (that is, "on") despite there being no water flowing. Fortunately I heard it before any damage to the pump. I got to it, moved the float up and down a couple of dozen times to free it, and things are ok for now. But it got me thinking: a: any suggestions for lubricant that would reduce the chances of this happening again? Fluid film? b: and... that 3/4 HP is way more than needed most of the time. Even in the worst of rains we could probably manage with less than half that, and more typically it's a 10 seconds on, two minutes off, kind of deal. Install 2 small sump pumps - one 4 or 5 inches above the other. The low pump does most of the work, but in heavy water conditions the second pump takes the excess. This is ONE place where a check valve is mandatory unless you use 2 outlets (which is not a bad idea - because if the main discharge gets plugged, causing the sump to overfill, the second pump has it's own outlet and can still work. So... I was wondering if there's an automatic variable output sump pump out there that anyone's heard of. The way I envision it is that if the water is six inches off the bottom, the pump would run at 0.1 HP. At ten inches it would ramp up to 0.5. At 24 inches it would switch to the full 1 HP output. (Numbers for illustration). So yeah, it would need multiple sensors or a funky float arrangement or something. I can visualize lots of ways of designing something like this, but I was wondering if such a beast was available off the shelf. Thanks for any suggestions. _________________________________________________ ____ Knowledge may be power, but communications is the key [to foil spammers, my address has been double rot-13 encoded] |
#3
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anyone know of an auto-variable output sump pump arrangement?
In Clare Snyder writes:
Install 2 small sump pumps - one 4 or 5 inches above the other. The low pump does most of the work, but in heavy water conditions the second pump takes the excess. This is ONE place where a check valve is mandatory unless you use 2 outlets (which is not a bad idea - because if the main discharge gets plugged, causing the sump to overfill, the second pump has it's own outlet and can still work. Eyup, that's one of the methods I was considering... But again, was thinking this is such a common situation someone, somewhere, must be offering a ready made solution.. Thanks -- __________________________________________________ ___ Knowledge may be power, but communications is the key [to foil spammers, my address has been double rot-13 encoded] |
#4
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anyone know of an auto-variable output sump pump arrangement?
On 12/4/2019 1:11 AM, danny burstein wrote:
In Clare Snyder writes: Install 2 small sump pumps - one 4 or 5 inches above the other. The low pump does most of the work, but in heavy water conditions the second pump takes the excess. This is ONE place where a check valve is mandatory unless you use 2 outlets (which is not a bad idea - because if the main discharge gets plugged, causing the sump to overfill, the second pump has it's own outlet and can still work. Eyup, that's one of the methods I was considering... But again, was thinking this is such a common situation someone, somewhere, must be offering a ready made solution.. Thanks No idea how common, what matters is if people care about it and would pay a considerable premium. I'd not pay it when the old way has worked for a century or so. |
#5
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anyone know of an auto-variable output sump pump arrangement?
On Wednesday, December 4, 2019 at 1:11:48 AM UTC-5, danny burstein wrote:
In Clare Snyder writes: Install 2 small sump pumps - one 4 or 5 inches above the other. The low pump does most of the work, but in heavy water conditions the second pump takes the excess. This is ONE place where a check valve is mandatory unless you use 2 outlets (which is not a bad idea - because if the main discharge gets plugged, causing the sump to overfill, the second pump has it's own outlet and can still work. Eyup, that's one of the methods I was considering... But again, was thinking this is such a common situation someone, somewhere, must be offering a ready made solution.. Thanks -- __________________________________________________ ___ Knowledge may be power, but communications is the key [to foil spammers, my address has been double rot-13 encoded] Few people would want the extra complication and cost to save, what? Not much. Just because a pump is rated at 3/4 HP doesn't mean a 3/8 HP one will use half the energy to move the same amount of water. The lower rated pump will use somewhat less, but it still has to do the same work, move the same amount of water. In the grand scheme of things, it's not worth it. This is like BMW putting a variable speed aux fan in front of the radiator, instead of a simple fixed speed one controlled by a thermostatic switch. It costs $450 and the variable speed electronics sit exposed to high temp, driving rain, salt in winter, etc. They last a couple years. |
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