Water Pump Specials

Did you know centrifugal pumps make up 85% of most water pump designs? We're excited to release a new self-priming AMT centrifugal 4" pump, but first, a little more information on just how those centrifugal pumps work. 

A centrifugal pump uses centrifugal force to generate pressure and flow. The pump pulls water into the eye of the impeller, then spins the water to force it the outer edge of the impeller. The amount of flow and pressure is only limited by the size of your impeller, the material strength, and speed of rotation.

Centrifugal pumps can be used as a single or multiple stage pump. Each stage has its own impeller. The impellers can also be used in a series, which means larger amounts of pressure can be generated at the required flow rate. When the pump is hooked up in a series or parallel, this allows the pressure or flow to increase. The case pressure capabilities must be noted to be sure the sum of the pressure does not exceed your case pressure capability. 

So if centrifugal pumps make up 85% of all water pumps designs, what sorts of pumps could you find with the centrifugal pumping mechanism? Just a few include jet pumps, sump pumps, sewage pumps, and utility pumps. You can click to shop all centrifugal pumps offered by Absolute Water Pumps. 

What’s the use? 

When you have a centrifugal water pump, you can use the pump for: 

• transferring water
• supplying water for irrigation 
• supplying water for equipment 
• your business
• your home 

Where does the energy come from? 

Centrifugal pumps can be powered by electric motors, gas or diesel engines, power take-offs from tractors, or any other rotary force than spins the impeller in order to move water. Most impellers are attached to direct power sources, but they can also be remotely attached to the pump by the rotary shaft. 

What makes up my centrifugal pump? 

There are two working parts to your pump: the impeller and the volute. The impeller imparts connective energy to the liquid being pumped. The volute gives the direction and control to the liquid.  

Then you have the pump case. Your pump case fills with water, which is called priming. When the impeller turns and forces water to the outside circumference, the water moves towards the pump’s discharge. As the water moves. a vacuum is formed at the eye of the impeller, which causes more water to move into the impeller. 

The vacuum creates a pressure differential with outside atmospheric pressure. With the atmospheric pressure greater inside the pump, the outside pressure pushes a continuous flow of liquid into the pump. As you increase your altitude, your atmospheric pressure decreases. 

So what’s that thing about priming? You can “prime” or “lose prime.” When you lose prime, it means your centrifugal pump’s impeller is pulling in air. If that happens, pressure can’t be created. Think about it this way: if you’re drinking soda through a straw, and you take your lips off the straw, air will enter and the soda will fall back into your cup.  

Then there’s the idea of “self-priming,” which is not exactly correct. The major difference between straight end suction and self-priming is the location of the suction opening. When you have a self-priming pump, the suction and discharge ports are above the eye of the impeller. A self-priming pump is really a “prime-it-once” pump. 

Now what about altitude? Altitude is very important when considering a new centrifugal pump purchase. If a pump is pumping from a positive suction of flooding suction, you have a booster pump. If it’s below, it’s referred to as a negative suction lift. With a negative suction lift, there’s a practical limit at sea level of 25 feet. By design, some pumps cannot lift water with a suction of 25 feet. Be sure to note your pump’s limitations. 

The limitations are set by the sum total of elevation change, friction loss, and altitude of location. Limitations are based on atmospheric pressure and properties of the fluid being pumped. As you increase altitude, the ability to lift water from the source changes.  

Now, to introduce our brand new AMT Self-Priming 4” Centrifugal Pump. This pump is designed for a wide range of high capacity applications which include: 

• liquid transfer
• dewatering
• circulation
• irrigation
• drainage 

The dual volute design reduces the radial load on your motor, and the centerline discharge feature is especially designed to prevent vapor binding, which makes for convenient piping connections. All models of this pump feature a self-cleaning, semi-open stainless impeller, which handles semi-solids up to a 1/2” in diameter. Built-in check valves for fast priming are standard on all units. Fill and drain plugs for easy installation and servicing. 

Here are the features we love about the AMT 4” Self-Priming Centrifugal Cast-Iron Pump: 

• Cast iron construction with stainless steel impeller
• Buna-N mechanical seal, check valve, O-ring 
• Optional silicon carbide seal available 
• 4” NPT suction and discharge ports 
• Maximum solids handling of 1/2” 
• Maximum temperature of 180 degrees F
• Maximum flow: 660 GPM
• Maximum head: 114 feet
• Self priming to 20 feet 
• Self-cleaning, semi-open impeller
• 10 to 15 HP TEFC single and 3-phase motors 
• Optional mounting base available 

It’s distressing enough when you need to remove clear, standing water from an area such as a basement. But when debris is added into the mix, the job of clearing the space so that it can be lived in again becomes even more complicated.

Case in point: We know of a home where the basement was flooded through back yard window wells that were located in close proximity to planting beds at the top of a berm. When a rainstorm caused the ditch behind the berm to fill, the water ran down the other side of the slope, carrying yards and yards of mulch with it. The mucky mess eventually gathered in the very large window wells, placing pressure on the panes of glass until they gave way, flooding the entire basement in a mixture of water, dirt and garden products.

At that point, pumping out the basement became a job for a machine known as a trash pump. Choosing the right trash pump for the situation involves considering a number of issues:

Semi-Trash Pumps, as the name implies, can handle small debris, but nothing much bigger than that, as the pump housing isn’t big enough to take on larger items. This makes semi-trash pumps more useful for pumping out water with sand and some mud.

Trash Pumps can pass solids and debris such as pebbles, leaves and twigs. This is because these machines have larger impeller veins and pump housings. Unlike other processing items such as a wood chipper, however, trash pumps do not grind up the debris. They simply pass it through as is. Should the machine get clogged, it can be opened for a relatively easy clean out. Note: As with any machine, make sure the power is off and consult your owner’s manual before attempting to open any part of it for maintenance.

Diaphragm Pumps use a different system than other trash pumps. Rather than relying on centrifugal force to remove water and debris, the machine uses a diaphragm that moves up and down, which creates a vacuum. These are usually used to pump out abrasive liquids as well as sludge. One possible use for a diaphragm pump: Draining a pond, since the machine could handle the muck on the pond’s bottom as well as weeds, water or leaves.

Any time of the year, you are bound to find great savings on selected pump models at Absolute Water Pump. The savings come in different places at different times of year, and now, you can get great buys on Subaru and AMT water pumps.

Under our current sale, both of these brands are 5% off with the purchase of two or more pumps. Here is a spotlight on some of the great pumps available from these brands:

-Subaru Water Pump, RPS-65011: This submersible pump is a better value than ever at sale prices! It has a tough aluminum housing combined with a nylon impeller, making it efficient, sturdy, and lightweight. The Subaru-powered electric motor allows it to run continuously all the way until the job is done! Clear water objects are no obstacle for this device, check it out!

-Subaru Water Pump PKX220: This powerful dewatering pump has a standard 2-inch inlet, and is extremely well suited to low sediment water removal. This pump can run through 172 gallons of water per minute, so it works at a powerful pace! It comes with the industry best five-year limited warranty from the manufacturer, a sturdy steel frame, low oil detection to automatically shut off the engine during a shortage, and tons of other useful features.

-AMT Gorman-Rupp Water Transfer Pump: A part of Absolute Water Pump’s great seasonal savings on AMT products, this water transfer pump will get the job done in a hurry. It is ideal for moving saltwater, some liquid fertilizers and herbicides, and dewatering tasks. Its 4 horsepower Briggs and Stratton gasoline engine allows it to transfer up to 9600 gallons of water per hour, and provides a max total head of 120 feet. Amazing! It’s powerful and compact at a mere 40 pounds to boot.

-AMT by Gorman-Rupp Trash Pump 3930-95: This trash pump contains a reliable Briggs and Stratton CP650 Vanguard gasoline engine. It can hold firm in tough weather and conditions, so you can count on it in any place at any time of year! It comes with a three-year engine and one-year pump warranty, and is ready to give you gallons of return on your water pump investment. And with the current AMT pump savings at Absolute Water Pumps, now is a great time to check out this heavy-duty trash pump!

Subaru and AMT water pumps are reliable and efficient. And now, they are better buys than ever at Absolute Water Pumps! See these and other great deals on our online store.

Our business at Absolute Water Pumps is largely in the sales and distribution of brand new water pumps and water pump accessories. We specialize in preparing our customers to handle dewatering and water movement in a variety of applications with full warrantied equipment of the latest and greatest engineering and design quality. Frequently though, we are visited by customers looking for a good deal or, at a minimum, are in a position to need a water pump, but the present budget does not allow for a brand new model. We can appreciate the unexpected pump failure when budgets are tight and you need a replacement water pump that won’t force you to empty your pockets or burn what profit was in a job’s budget to begin with. As well, in today’s economic climate, we are all forced to employ a bit of frugality for the sake of the bottom line as it is not getting any easier to make sure there’s profit left over to take home when the job is done. For those and many other reasons, Absolute Water Pumps has, for some time, identified and responded to our customer’s desire for a price competitive alternatives by offering a variety of solutions like used water pumps, refurbished water pumps, re-built water pumps, scratch and dent water pumps, discontinued water pumps, liquidation water pumps, and customer returned water pumps.

These offerings provide our customers the benefits of like new condition with all the functionality of a brand new pump and yet a price tag far below typical retail prices.

Because these are not brand new pumps at brand new prices, there are some distinct differences that accompany the price discount that any reasonable buyer can anticipate. Though not every discounted pump will be represented by every item below, your discounted pump may have limited warranty, cosmetic blemishes, operating hours revealing previous use, replaced parts, and obsolete or discontinued models.

There are also times when we do not have a thorough set of pictures of the unit because it is not presently warehoused at one of our locations where we are afforded immediate access. In the absence of a thorough report and pictures, we will do our best to represent the piece of equipment with the most accurate information and pictures we are afforded by the manufacturer where the pump is located. At times we will assign a picture of a new unit to provide our customers a concept of what is being sold. This is not for the purposes of mis-leading our customers, but to simply represent the product that is being sold.

All pumps within this discounted category are sold on a “buyer-beware” basis within the terms of the manufacturer limited warranty assigned to the used, refurbished, re-built, scratched, dented, discounted, liquidated, or customer returned equipment. We would encourage you to take a trip and review the piece of equipment in person prior to purchasing if you have any concerns that may cause buyer remorse upon delivery to your location.

If you are a buyer of pumps and wish to be on our distribution list for used equipment when we add to our inventory, please contact us and let us know that you would like to keep posted on our new (used) releases. Click here to see our inventory of discount water pumps.