- This topic has 5 replies, 4 voices, and was last updated 21 years, 4 months ago by hj.
5 Jul 2000 at 1:22 am #273166MasterPlumbersKeymaster
Can water be pulled? I usually here of water being pushed over distances. Somebody told me that
eventually water will break down.
6 Jul 2000 at 12:32 am #287011SylvanLMPParticipant
What’s easier PUSHING a car or pulling it?
In theory water can be sucked up (pulled) 32 FT BUT super pumpers can pump water in excess of over 200 FT
Now you can do the following to make life easier.
For example a high rise building say 47 stories @12′ per story then add say another 20 feet for a roof tank height
Then you get a pump capable of developing 254 PSI and times this pressure 2.31 = 587 ft Approx.
Now think about letting Nature do its job (Like YOU letting the car roll down hill) Here we have a roof tank filled with water and we let it drain BY GRAVITY. Do you realize the pressure at the bottom of this piping set up would be 253.45 PSI NOT including the FORCE if we bothered to calculate the weight of the water in this no flow piping.
So in reality here we can use a small pipe to supply a BIG pipe with a little pump and let nature tank over…. PLUMBING is amazing HUH?
6 Jul 2000 at 1:12 pm #287012hjParticipant
The best pump made can only pull water 26 feet, but if it is strong enough and the piping could handle the pressure, it could push the water to the moon. Pushing or pulling a car requires the same effort and you have to have a pump that can push the water up to that rooftop tank in the first place.
6 Jul 2000 at 9:40 pm #287013SylvanLMPParticipant
<< Dear old Archimedes invented the screw pump to pull water from one level
to another, essentially a dirt auger in a close fitting tube on end in the
lower level and
the other discharge end with the crank at the top. The mine pumps which
first Vacuum engines pulled the water up in roughly 32′ stages. They had to
you couldn’t have a steam boiler at the bottom of the mine. The New York
the best because it uses gravity. Pump the water to the roof and regulate
on the way down.
7 Jul 2000 at 12:16 am #287014Art_xyzParticipant
In a perfect vacum (outer space) maximum suction lift is 33.9 ft. Here on Earth (with a good pump) appx. 32 ft.
7 Jul 2000 at 5:15 am #287015hjParticipant
In outer space air pressure is zero therefore the amount of lift is zero. If the perfect vacuum is applied above the liquid inside a sealed or otherwise closed system, then the atmospheric pressure of approx. 15# will lift it to approx 33 ft. Since that is not attainable, the practical limit is about 26 feet with normal pumps.
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