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While it's easy to push on water, it's hard to pull on water. When you drink soda through a straw, you may feel like you're pulling on the water, but you're not. What you are actually doing is removing some air from the space inside the straw and above the water, so that the air pressure in that space drops below atmospheric pressure. The water column near the bottom of the straw then experiences a pressure imbalance: the usual atmospheric pressure below it and less-than-atmospheric pressure above it. That imbalance provides a modest upward force on the water column and pushes it up into your mouth. So far, so good. But if you make that straw longer, you'll need to suck harder. That's because as the column of water gets taller, it gets heavier. It needs a more severe pressure imbalance to push it upward and support it. By the time the straw and water column get to be about 40 feet tall, you'll need to suck every bit of air out from inside the straw because the pressure imbalance needed to support a 40-foot column of water is approximately one atmosphere of pressure. If the straw is taller than 40 feet, you're simply out of luck. Even if you remove all the air from within the straw, the atmospheric pressure of the water below the straw won't be able to push the water up the straw higher than about 40 feet. To get the water to rise higher in the straw, you'll need to install a pump at the bottom, or a submersible pump. The pump increases the water pressure there to more than 1 atmosphere, so that there is a bigger pressure imbalance available and therefore the possibility of supporting a taller column of water. The submersible pump can boost the water pressure well above atmospheric and thereby push the water to the surface despite the great height and weight of the water column. Multiple stage submersible pumps are arranged in series so that the discharge from the first stage becomes the intake for the next stage with each successive stage adding its pressure to the previous one. Surface suction pumps are really only practical for water that's a few feet below the surface; after that, deep pressure pumps are a much better idea.

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∙ 17y ago

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Related Questions

How does a submersible pump work?

As the name suggests submersible pumps work underneath the surface of the earth. Unlike regular pumps they push water or other liquids to the surface instead of sucking it up from above the surface.


Importance of a submersible pump?

Submersible pumps can be applied to many distinct applications, from pumping large solids or grinding solids to smaller sizes, to transferring waste water at large flow rates or high pressures, to simply pumping up water off the floor or the bottom of a tank; depending upon submersible pump design. Some of the more common submersible pumps designed for specific applications include water submersible pumps, sewage submersible pumps, 12 volt submersible pumps, sand submersible pumps, irrigation submersible pumps, and solar submersible pumps. Solar submersible pumps, while not specific to an application, are best used for slow and steady water transference into a holding tank, but may also be used for direct pressurization applications.... that's my answer... shreya :)


How do submersible dewatering pumps differ from other types of pumps?

A submersible dewatering pump is designed to work while submerged in the water that needs to be removed. Unlike surface-mounted pumps, it does not need to draw water through a long suction pipe. Instead, it is placed directly in a sump, pit or excavation and pushes the water through a discharge pipe. This makes it particularly useful for construction sites, mines, basements, tunnels and other areas where accumulated water needs to be removed efficiently. The main differences include: A submersible pump operates underwater, while conventional surface pumps are installed outside the water source. It generally does not require manual priming because the pump is already immersed in the liquid. It avoids the suction-lift limitations associated with many surface-mounted pumping systems. Its compact submerged installation can be useful where available space around the sump or excavation is limited. Many models are designed to handle muddy water and suspended solids commonly found at construction and mining sites. Submersible pumps can often be moved between different dewatering points, making them practical for temporary applications. Selection depends on factors such as required flow, pumping head, water quality, solids content and operating depth. Cosmos Pumps also offers submersible dewatering pumps for applications including construction, mining, tunnelling and general site dewatering. Its range includes standard, high-head and ultra-high-head options, allowing pump selection based on the required flow and head conditions. In simple terms, the key difference is the installation and operating principle: the pump works directly in the water rather than being positioned outside and relying on suction to bring the water to it.


Where submersible motors used?

Primarily in submersible well pumps. There are also applications in fountains, indoor recirculating waterfalls and sump pumps.


Does Home Depot rent submersible pumps in Tampa, FL?

Yes, Home Depot does rent submersible pumps. You can visit there website, Homedepot.com, to find out more about the pumps that they offer for rent.


Do you have a pump?

Yup. I do have. I have gear pumps, water pumps, diaphragm pumps, vacuum pumps and blowers, submersible pumps, centrifugal pumps and filters.


What is the suction pressure required for submersible pumps?

10 psi


Where can one purchase a fountain pump for a pond?

There are several places to purchase a submersible water pump. Sears is a national retailer that sells the submersible water pump. There are also places online to purchase a submersible water pump such as Amazon, Water Pumps Direct, or Way Fair.


How long do submersible well pumps last?

In very clean wells I have seen submersible pumps 18-20 years old. Unfortunately any degree of silt lessens the life of pumps and I would guess the average to be about 14 years.


What is a submersible well pump used for?

A submersible well pump is a pump that is used for pumping water from wells. There are websites that offer submersible well pumps for sale if you need one.


How do you tell if you need a new submersible pump?

If nothing pumps out you need a new pump


Where can you buy a 2 inch submersible pump?

Anywhere they sell pumps, even if they have to order it for you