64 hertz and a Kill-a-Watt

[BobRip]

Millions of 120V motor driven wall clocks out there. Single phase synchronous .

Your right. Not a very big load though.

 

[Egon]

Might find quite a few multi stage centrifugal pumps that produce decent pressure.

 

[Willie B]

The vacuum side of a pump does not lift water, it removes a portion of atmospheric pressure, Atmospheric pressure 14 approx psi presses down on the water at static level of the well. The depth of suction line is unimportant, water rises up from its surface as pressure without pump would be equal in or out. As the pump removes pressure, (a portion of atmosphere) inside the pipe atmospheric pressure pushes water up to the pump. Hypothetically, remove 7 pounds pressure the difference would be about 7. This, without allowing for friction loss could lift to the pump 16 feet in elevation.

Once in the pump chamber pushing begins. Centrifugal single stage pumps I have seen can produce as much as 70 PSIG. Again ignoring friction loss a column of water 150 feet tall could be lifted.

Submersible pumps are usually centrifugal, multi stage, in their small diameter housings are a stack of impellers each increasing pressure before passing water on to the next. They lift water hundreds of feet out of the depths of a well with enough pressure left to charge your pressure tank enabling you to shower without the pump immediately starting.

 

[Willie B]

I'm not a hack. I'm not a liar.

 

[Egon]

(The vacuum side of a pump does not lift water, it removes a portion of atmospheric pressure, Atmospheric pressure 14 approx psi presses down on the water at static level of the well. The depth of suction line is unimportant, water rises up from its surface as pressure without pump would be equal in or out. As the pump removes pressure, (a portion of atmosphere) inside the pipe atmospheric pressure pushes water up to the pump. Hypothetically, remove 7 pounds pressure the difference would be about 7. This, without allowing for friction loss could lift to the pump 16 feet in elevation.)


Net positive suction head.

 

[buickanddeere]

Tried to state a couple of times that no pump can lift more than 33ft on earth at sea level. And 20-25ft is about the limit. Got poofed twice.

 

[Ken45101]

I have never seen a synchronous motor on a domestic system. Dont they require three phase?

IIRC, the motors in electric clocks are synchronous.

 

[BobRip]

IIRC, the motors in electric clocks are synchronous.

True, I forgot. I recently opened a modern analog clock and noticed in was driven by an internal quartz oscillator. I guess it is still s synchronous motor.

 

[Egon]

Tried to state a couple of times that no pump can lift more than 33ft on earth at sea level. And 20-25ft is about the limit. Got poofed twice.

Net positive suction head!

 

[Soundguy]

you CAN have cavitation ont he suction side..

you can have cavitation in the water jacket of an engine too. vibration/air bubbles, colapse.. erosion..e tc..

 

[Willie B]

No gauge, no pressure tank, except the nipple and reducing bushing I installed on the advice of an expert, no restriction. Suction of three feet elevation. Lift above pump is 59 feet. If I am correct static pressure from that much gravity would be 26 PSIG. If cavitation occurred I'm not aware of it. You are correct. I'm not an expert. I'm an electrician. My resume is short; 1 job 45 years. This was an inlaw project. I'm now sorry. I'll make an effort to not trouble you with my faulty facts in future.