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DAE Pumps dredging equipment is ideal for a variety of applications, including dredging dams, ports, marinas, rivers, canals, lakes, ponds, and more. Ensuring water quality and capacity are essential in hydroelectric and water supply dams, making DAE Pumps dredge pumps perfect for removing excess sand and silt. Clearing sediment and contaminates from riverbeds, channels, canals, and oceans help restore safe navigation and shoreline formations, and dredging lakes and ponds clean and remove contaminants and tailing. As ocean currents move sediments, the seafloor slowly rises, lowering the depth of marinas and ports. Dredging ensures safe access for boats and other water vessels.

Centrifugal pumps from DAE Pumps are perfectly suited for demanding process applications. Their heavy-duty construction ensures long-lasting performance in rugged conditions. The DAE Pumps knowledge and experience building top-of-the-line pumps make our centrifugal process pumps ideal in many markets and applications.

The durable DAE Pumps centrifugal pumps provide a proven ability to handle a variety of applications in the water and wastewater industries. These reliable instruments are perfect solutions for pumping chemicals used to treat water, irrigation, fountains, and much more.

For help selecting the most efficient pump for your project, call us at (760) 821-8112 or submit a request. Find the right pump size, volume, speed that you need. Get a FREE custom pump curve to ensure the right pump.

The motor or engine on a pump is as important as the pump itself. It is the driving force that makes the pump go. DAE Pumps offer a variety of motor choices: electric, diesel, and hydraulic.

Frames and skids hold the pump and motor together to make a complete unit. The frame provides stability for the placement of the pump and motor with the intent of a permanent install or seldom movement. The DAE Pumps trailer brings mobility to centrifugal slurry pumps. The whole unit, skid included, is mounted onto a trailer for mobile accessibility. Many industries use centrifugal pumps for performing multiple applications, and they move from one location to another quite frequently. The trailer provides a tremendous advantage of being on wheels.

Centrifugal pumps come in many shapes and sizes. There are two main parts to a centrifugal pump; the pump and the motor/engine. The electric motor or a diesel engine converts the energy it creates into mechanical energy. This mechanical energy drives the pump and moves the water. The centrifugal slurry pumps pull water and other materials in through the inlet and pushes it out through the outlet/discharge.

The electric motor and diesel engine work relatively similarly. A motor consists of a fan and protective casing mounted at the back. Inside the motor is the stator. The stator holds copper coils. Concentric to this is the rotor and shaft. The rotor rotates, and as it spins, so does the pump shaft. The shaft runs the entire length of the motor and into the pump where it connects to the pump’s impeller.

There are a couple of variations to a centrifugal pump. Some models of centrifugal pumps have a separate shaft for the pump and the motor. The connection between the separated shafts is called the coupling. These coupled pumps will contain a bearing house with bearings. The pump shaft then continues into the pump casing. As it enters the casing it passes through a gland, packing, and the stuffing box, which combined to form a seal. The shaft then connects to the impeller. The impeller imparts centrifugal force onto the fluid that makes it to move liquids through a pipe or hose. The impeller is in the pump casing. The casing contains and directs the flow of water as the impeller pulls it in through the suction inlet and pushes it out through the discharge outlet.

At the pump casing, there is a channel for water to flow along, which is called the volute. The volute spirals around the perimeter of the pump casing to the outlet. This channel increases in diameter as it makes its way to the outlet. The shaft passes through the seals and into the pump casing, where it connects to the impeller.

Liquid engulfs the impeller, and when it rotates, the fluid within the impeller also spins and is forced outward to the volute. As the fluid moves outwards, off of the impeller, it creates a region of low pressure that pulls more water in through the suction inlet.  The fluids enter the eye of the impeller and are trapped there between the blades. As the impeller rotates, it imparts kinetic energy or velocity onto the liquid. By the time the liquid reaches the edge of the impeller, it is moving at a very high speed. This high-speed liquid flows into the volute where it hits the wall of a pump casing. This impact converts the velocity into potential energy or pressure. More fluid follows behind this developing a flow.

The thickness of the impeller and the rotational speed affects the volume flow rate of the pump and the diameter of the impeller, and the rotational speed increases the pressure it can produce.

Net Positive Suction Pressure or NPSH is associated with pump suction. At the end of this acronym are two other letters NPSHR and NPSHA. The R is the required NPSH. Each pump tests for this value. At DAE Pumps, we provide a pump operation chart with all our specs. The R-value is a warning or danger point. As the fluid enters the pump and flows into the impeller’s eye, it experiences a lot of energy due to the friction, giving a pressure drop. At certain conditions, the fluids flowing through this section can reach a boiling point. Once this happens, cavitation may occur.

The last letter in NPSHA stands for Available. The net positive suction pressure available depends on the installation of the pump and should be calculated. NPSHA takes into consideration things like insulation types, elevation, liquid temperature, liquid boiling point, much more. Available pressure should always be higher than the required value. For example, if the NPSHA is 12 for the pump requiring an NPSHR of 4 then the pump should be okay. However, a pump that required an NPSHR of 15 than the available NPSH is insufficient, and cavitation will occur.

DAE Pumps provides custom pump curves per the information you provide. Including as much information about the project allow us to best match a pump with your needs, so the centrifugal pump you get is ideal for the project.

Cavitation in pumps is the deterioration of the pump’s metal due to the overheating of water. Cavitation destroys the pump’s impeller and casing that lead to replacing parts and the pump altogether.

Water can turn from a liquid state into steam or gas and boils at around 100 degrees Celsius at sea level. However, at a higher elevation, water boils at a lower temperature because of atmospheric pressure. If this pressure is less than the vapor pressure of the liquid that is pumping, then the water can reach a boiling point. When this happens, cavitation occurs.

During cavitation, air particles within the water expand, and as they reach the boiling point, they collapse in on themselves very rapidly. As they collapse, they start to damage the impeller and pump casing. This damage removes small parts of metal from the surface, and if this keeps occurring, then it will eventually destroy the pump. Therefore, you must ensure the Available pressure is higher than the Required pressure of the pump.

DAE Pumps provides a full spectrum of centrifugal slurry pumps and accessories for completing all your tough dredging projects.We provide turnkey solutions with complete centrifugal slurry pump systems that includeslurry hoses, slurry flow meters, power units,and more.Choose from multiple sizes of slurry hoses for the transferring of materials, wireless flow meters for measuring the flow rate in gallons per minute of liquid, and power units for operation.Parts are always in stock and available for immediate shipping to anywhere in the US and the world.

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Explore a wide variety of submerged centrifugal pump on Alibaba.com and enjoy exquisite deals. The machines help maintain drilling mud circulation throughout the project. There are many models and brands available, each with outstanding value. These submerged centrifugal pump are efficient, durable, and completely waterproof. They are designed to lift water and mud with efficiency without using much energy or taking a lot of space.

The primary advantage of these submerged centrifugal pump is that they can raise water from greater depths. With the fast-changing technology, purchase machines that come with the best technology for optimum results. They should be well adapted to the overall configuration of the installation to perform various operations. Hence, quality products are needed for more efficiency and enjoyment of the machines" full life expectancy.

Alibaba.com offers a wide selection of products with innovative features. The products are designed for a wide range of flow rates that differ by brand. They provide cost-effective options catering to different consumer needs. When choosing the right submerged centrifugal pump for the drilling project, consider factors such as size, shape, and machine cost. More powerful tools are needed when dealing with large projects such as agriculture or irrigation.

Alibaba.com provides a wide range of submerged centrifugal pump to suit different tastes and budgets. The site has a large assortment of products from major suppliers on the market. The products are made of durable materials to avoid corrosion and premature wear during operations. The range of products and brands on the site assures quality and good value for money.

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Explore a wide variety of centrifugal mud pump 30kw on Alibaba.com and enjoy exquisite deals. The machines help maintain drilling mud circulation throughout the project. There are many models and brands available, each with outstanding value. These centrifugal mud pump 30kw are efficient, durable, and completely waterproof. They are designed to lift water and mud with efficiency without using much energy or taking a lot of space.

The primary advantage of these centrifugal mud pump 30kw is that they can raise water from greater depths. With the fast-changing technology, purchase machines that come with the best technology for optimum results. They should be well adapted to the overall configuration of the installation to perform various operations. Hence, quality products are needed for more efficiency and enjoyment of the machines" full life expectancy.

Alibaba.com offers a wide selection of products with innovative features. The products are designed for a wide range of flow rates that differ by brand. They provide cost-effective options catering to different consumer needs. When choosing the right centrifugal mud pump 30kw for the drilling project, consider factors such as size, shape, and machine cost. More powerful tools are needed when dealing with large projects such as agriculture or irrigation.

Alibaba.com provides a wide range of centrifugal mud pump 30kw to suit different tastes and budgets. The site has a large assortment of products from major suppliers on the market. The products are made of durable materials to avoid corrosion and premature wear during operations. The range of products and brands on the site assures quality and good value for money.

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Tsurumi has a huge range of submersible pumps, with more than 25 different pump types, this submersible pump specialist has a pump for almost any application, from light domestic usage to heavy duty industrial applications, model dependant Tsurumi submersible pumps can be supplied either free standing or with a guide rail system consequently suitable for fixed or mobile applications, must pump models can be supplied with optional float-switch.

Our Tsurumi submersible pumps are available with a variety of impeller types to suit a number of applications and fluids from domestic clean water distribution to industrial sewage, sludge and slurry transfer, depending on the model specified these submersible pumps can handle a max. liquid temperature of 40°C and has a max. solids passage of 100mm.

The Tsurumi LH & LH-W pump range is a high pressure dewatering submersible pump capable of achieving up to 21.17 bar and with a max. flow rate of 390 m³/h, these pumps are supplied with a hard ductile iron pump casing and cast iron motor casing, the LH & LH-W range is commonly used in mining, quarry and deep excavation projects, these high head dewatering submersible pumps are supplied with a chromium iron impeller and dual hard face mechanical seal (silicon carbide – silicon carbide).

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An innovative product policy and continuous advancement of essential design features make this pump a powerful, yet economical standard unit with a broad range of applications.

Professional China Mud Pump - BNS series Single Stage, End Suction Norm Centrifugal pumps – Beken, The product will supply to all over the world, such as: , , ,

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Sludge, slurry and sewage—three topics that aren’t a subject of everyday “pleasant” conversations. Any of these words conjures images of yucky goo, germs, and debris. But dealing with these fluids is a fact of life, and you need the right kind ofsubmersible pumpto handle the heavier load.

Having the right pump helps considerably with handling sludge and slurry safely. But with many brands and types of pump on the market, what kind of heavy-duty pump do you need to handle the workload?

Sludge pumps and slurry pumps are often considered interchangeable, but they do have slightly different functions. Both sludge and slurry are fluids with a high percentage of solids, but sludge is softer and thicker. Slurry is thinner and flows through the pipes more easily.

This article explains everything you need to know about sludge and slurry pumps, including the difference between a sludge pump and a slurry pump, and when you might need one.

Sludge has a thick texture that may be very viscous or sticky, making it difficult to pump. However, with a higher percentage of solids, it is more compact and can facilitate the disposal of waste products.

Being easier to pump, slurry is the preferred output where waste needs to be transported in liquid form. Being distributed in a liquid suspension, slurries can make it easier to relocate and dispose of waste products in the mining and construction industries.

Both sludge and slurry are mixtures of liquid and pulverised solid waste, but they are not the same. Sludge has a heavier consistency, like thick mud, while slurry is thinner and less viscous.

The main difference between sludge and slurry is the texture, rather than the composition of the fluid. Both slurry and sludge contain solids such as sand, mud, metals, sediments, and other particles within the liquid. They may be organic (like sewage) or non-organic.

Sludge is a thick and viscous fluid, and may be sticky, while slurry is thinner and flows more easily. This means that pumping requirements can vary significantly between these two fluids, and is also influenced by the type of particles found in the material.

The purpose of the sludge pump is to move sludge through sewer lines or other systems. Sludge can be heavy and often abrasive and corrosive; therefore, these pumps need to be high-powered. The heavier the sludge, the more horsepower that is required.

Centrifugal pumpsare commonly used thanks to their ability to pump effluent reliably. A centrifugal pump consists of a rotating impeller that converts electrical energy from the motor into kinetic energy. The kinetic energy is then converted to pressure, which creates the flow of the sludge through the pump.

These pumps can handle particles up to the size of sand, and flow rates can go as high as thousands of litres per second. However, these pumps cannot generate pressures higher than 1000 psi.

Positive displacement pumps work differently. While centrifugal pumps use continuous energy to increase the sludge flow, positive displacement pumps work by intermittently adding energy to increase pressure. They can generate more pressure than centrifugal pumps, but their flow rate can only go up to nine hundred and fifty litres per second.

There are two designs for the positive displacement pumps: either reciprocating (such as the plunger and piston design) or rotary (progressing-cavity pumps and rotary vane vacuum pumps being examples).

Slurry pumps are the type of pumps that are appropriate for pumping slurry. Choosing the suitable pump will depend on the size and types of solids in the slurry liquid and how corrosive the slurry mixture is. The larger and more corrosive the slurry is, the more heavy-duty the pumps would need to be.

Centrifugal pumpsare mainly used for slurry at concentrations less than seventy percent solid by weight; and come in various appearances, such as horizontal, submersible, and vertical.

Positive displacement slurry pumps are more limited when it comes to capacity, but they are better for pumping slurry with higher concentrations of solid material.

Centrifugal pumps, such asBianco Vulcan centrifugal pumpare above ground pumps that can be added to existing pump lines to add more power and suction force to the set up. In comparison,submersible drainage pumpssuch as theNova submersible pumpare powerful pumps ideal for removing water from an area, either on a daily basis or in case of emergencies.

Positive displacement slurry pumps are more limited when it comes to capacity, but they are better for pumping slurry with higher concentrations of solid material.

Water pumps differ from slurry or sludge pumps. The viscosity and composition of these fluids mean they need much higher pressure and hydraulic capacity than water pumps. Finally, water pumps cannot withstand potential chemical corrosion and particle abrasion.

Sludge and slurry both contain solid particles, including (but not limited to) sand, gravel, and metals; the difference lies in their consistency. Furthermore, while the liquid in sludge and slurry can indeed be water, it can also contain other types of liquid such as petroleum and various acids.Due to the difference in viscosity and composition of slurry and sludge, installing and using the correct type of pump is imperative.For pumping slurries, a centrifugal pump or heavy-duty drainage pump is used.For pumping sludges, positive displacement pumps such as diaphragm pumps, lobe pumps, and Moyno pumps are best.

A sludge or slurry pump can be used to pump out sewage from sewage lines. The most common type of pumps used for sewage are centrifugal pumps. These pumps can effectively push sewage and can be installed in pits and sumps.

Due to their higher starting costs and complex maintenance, reciprocating pumps are less common than centrifugal pumps. Reciprocating pumps are used in specialised cases when a larger-than-normal quantity of sewage needs to be pumped.

If you are dealing with a small amount of sewage that doesn’t justify the need to construct a pumping station, you can use air pressure pumps or pneumatic ejectors. Unlike other pumps with spinning impellers or pistons, these pumps use compressed air to move sewage. These small-capacity pumps are quieter, have fewer moving parts, and develop blockages less frequently. However, they are the least efficient among the pumping options available.

Because there are several conditions where a slurry pump or a sludge pump is called for, there are three types of installations to consider: dry installation, semi-dry installation or wet installation, which involves fully submerging the pump.

First is a dry installation where the bearings and the pump drive are kept out of the sludge or slurry. The wet end—which may include the impeller, suction liner, shaft sleeve, and shell—is free-standing and out of the way of any liquid. Horizontal slurry pumps are mostly dry installations.

The second method is semi-dry installation. The operator floods the wet end and the bearings but keeps the drive dry. This installation is often used for dredging with horizontal pumps.

The final method is wet installation. Using this method, the slurry pump and drive are fully submerged. Wet installation is often reserved for underwater operations, cement plants, dyeing and printing plants, and similar industries. The pumps used are oftenvertical centrifugal pumpswith semi-open impellers.

A pump is cavitating when the liquid in the pump turns to vapour at low pressure. Cavitation happens when voids (or bubbles) form within the slurry because the pressure rapidly decreases below the vapour pressure.

Sewage ejector pumps can pump high volumes of sewage to a maximum of about230 metres. Septic grinder pumps are better for low volumes but can pump sewage a much longer distance.

The type of pump needed depends on the type of wastewater that needs to be pumped. Centrifugal pumps are good for sludge wastewater with less particulates or solids. Rotary lobe pumps are great for thicker or more viscous fluids. Progressive cavity pumps and the air-operated diaphragm pumps are also suitable for sludge.

While it is possible to pump mud, it’s difficult and complex, so it requires specialised equipment. A reciprocating piston-driven or plunger-driven pump specially made to pump mud is needed for the task, and these can be expensive.

It’s best to have a pump professionally installed by a licensed specialist. Slurry pumps are intricate systems that won’t work correctly if not installed properly. To avoid issues with your slurry pump system, we always recommend getting it professionally installed.

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A ship consists of various types of fluids moving inside different machinery and systems for the purpose of cooling, heating, lubrication, and as fuels. These liquids are circulated by different types of pumps, which can be independently driven by ship power supply or attached to the machinery itself. All the systems on board ship require proper operational and compatible pump and pumping system so that ship can run on its voyage smoothly.

The selection of a type of pump for a system depends on the characteristics of the fluid to be pumped or circulated. Characteristics such as viscosity, density, surface tension and compressibility, along with characteristics of the system such as require rate of fluid, head to which the fluid is to be pumped, temperature encountered in the system, and pressure tackled by the fluid in the system, are taken into account.

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Self-priming pumps are a specific type of liquid pump designed to have the required liquid inside the cavity or pump body necessary to start the pumping process.This offers the potential for increased operating efficiencies in process plants where pumps are used for a variety of repeated yet intermittent operations.

Some pumps are designed to always have the requisite start-up liquid in the pump’s chamber or body. These are called “self-priming” pumps. Other pumps require the start-up liquid be added to the pump before initiating operation. No one type of pump is intrinsically superior to another: it simply depends on what the pump is used for and how often.

Some types of pumps are engineered to be automatically self-priming.Pumps of this nature feature close tolerance working parts that trap fluids in the pump’s body, preventing them from returning from the discharge side of the pump to the suction side when the pump is not in operation.

In these types of pumps, the constant presence of fluid in the pump’s body allows the pump to better handle what are called “air pockets”. Air pockets are an accumulation of air bubbles in the pump’s working mechanism, which can impair proper pump operation.

For these types of low viscosity fluids, a V-type centrifugal pump design is often preferred, featuring a vacuum pump and positive seal that is located close to the discharge port. This allows a V-type centrifugal pump to readily pull a vacuum until it is full of fluid.

However, standard centrifugal pumps are not designed to be self-priming.Unlike the pump types already described, standard centrifugal pumps do not trap liquids when not in use — although engineered modifications to the pump’s housing may allow some of these types of pumps to be self-priming.

With centrifugal pumps, the pumping action occurs when an impeller is rotated in a liquid within a cavity or chamber of the pump, displacing the liquid and forcing it to flow into the discharge port of the pump via centrifugal force.

Fluids typically enter the pump at the center of the impeller and are discharged via a port on the outer perimeter of the pump’s body. The impeller is often directly coupled to the pump’s motor, in what is called a monoblock design.

Air is the primary enemy of this type of pump. When a standard centrifugal pump encounters air pockets, it can become “air bound”, and refuse to operate. Air intrusion into standard centrifugal pumps is typical, as these types of pumps don’t feature tightly coupled pumping mechanisms such as gears or screws and have no seals between the suction and discharge sides of the pump.

Self-priming centrifugal pumps overcome air binding by initially mixing any residual air in the pump’s working mechanism with fluid during the priming process.

This blending allows the resulting mix to move readily through the pump’s body on initial start-up, removing the air and aiding product flow on the suction side of the pump. The process liquids and any entrained air move toward the impeller, and normal pump operations commence.

In comparison to a standard centrifugal pump, what’s notable in the design of a self-priming centrifugal pump is that it features a liquid reservoir built into the body of the pump, typically either above or in front of the impeller.

This reservoir allows the pump to rid the pump’s body and suction line of air during the priming cycle, replacing it with liquid from the reservoir that is blended into the residual air. The “self-priming” capability of this type of centrifugal pump comes from the ability of the reservoir to retain liquid after its very first prime.

When compared to submersible-type pumps, self-priming centrifugal pumps will continue to pump liquids even after the pump is no longer submerged in a liquid tank or vessel

Due to the need for a liquid reservoir, this type of centrifugal pump can be larger than a standard model, which may cause issues in applications where space is limited

The LKH Prime pump from Alfa Laval is a centrifugal-type self-priming pump that is ideal forCIP operations. The LKH Prime also easily pumps products with entrained air. Once the liquid no longer contains entrained air, you are left with a highly efficient and quiet LKH Pump, one of the most capable centrifugal pumps produced.

For product applications, this pump features an air screw coupled with a highly efficient centrifugal impeller to effectively handle a variety of process media.

The SP Series is a liquid ring pump from Ampco that uses compression chambers to pump, and only uses centrifugal force to seal the chambers with a liquid. It is excellent for CIP return operations and pumping products with entrained air.

The SP Series pump is efficient at emptying tanks and drums, and can handle shear-sensitive products due to its tight manufacturing tolerances and unique impeller shape.

Bornemann’s SLH Twin Screw Pump is a self-priming positive displacement pump best for aseptic processes and applications involving high viscosities, high pressures, or sensitive materials. The variable speed feature of this pump is suited for varying operating conditions.

The C-Series is an eccentric disc pump featuring Mouvex technology. This positive displacement pump uses its strong suction power and ability to run dry to gently and effectively move both liquid and dry products.

The C-Series is available in stainless steel models that carry 3-A approval and are designed to meet EHEDG specifications. This pump can be flushed and cleaned using CIP methodswithout disassembly and can pump both high and low viscosity products with outputs not affected by variations in liquid viscosity.

This guide is intended for engineers, production managers, or anyone concerned with proper pump selection for pharmaceutical, biotechnology, and other ultra-clean applications.

For hygienic processing applications that require the frequent yet intermittent use of liquid pumps, choosing a self-priming pump may be the best solution for ensuring efficient pump operations.We"re here to help!

CSI offers a number of self-priming pumps based on centrifugal, twin screw, and eccentric disc technologies. Contact CSI at (417) 831-1411 to discuss your requirements.

Central States Industrial Equipment (CSI) is a leader in distribution of hygienic pipe, valves, fittings, pumps, heat exchangers, and MRO supplies for hygienic industrial processors, with four distribution facilities across the U.S. CSI also provides detail design and execution for hygienic process systems in the food, dairy, beverage, pharmaceutical, biotechnology, and personal care industries. Specializing in process piping, system start-ups, and cleaning systems, CSI leverages technology, intellectual property, and industry expertise to deliver solutions to processing problems. More information can be found at www.csidesigns.com.

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Solinst Canada Ltd. has introduced the Model 415 12V Submersible Pump, a compact addition to its groundwater samplers line. Designed for purging and obtaining groundwater samples from 2-inch OD monitoring wells. Lightweight, portable, and easy to set up, deploy and operate. Pump’s sleek, short design allows it to fit easily down wells. Capable of pumping groundwater from 120 feet (36.5 meters) with flow rates up to 3.6 U.S. gpm (13.5 L/min) in shallow conditions. www.solinst.com

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Pressure PumpsLeading Wholesale Trader of mud pump bt 32.2 tssp ( 5 hp ), mud pump bt 611 tssp ( 15 hp ), mud pump bt 43.7 tssp ( 7.5 hp ), mud pump bt 700 sspf ( 1 hp ) and self priming automatic pump ( bt 50 spap / 0.5 hp ) from Pune.

Dewatering pumps are centrifugal pumps installed in a building that is situated below the groundwater level, to reduce the water level and then maintain it at this level. One example is in underground mining in which water penetrating into the adits is pumped up to the surface.

Dewatering pumps are centrifugal pumps installed in a building that is situated below the groundwater level, to reduce the water level and then maintain it at this level. One example is in underground mining in which water penetrating into the adits is pumped up to the surface.

Dewatering pumps are centrifugal pumps installed in a building that is situated below the groundwater level, to reduce the water level and then maintain it at this level. One example is in underground mining in which water penetrating into the adits is pumped up to the surface.

Dewatering pumps are centrifugal pumps installed in a building that is situated below the groundwater level, to reduce the water level and then maintain it at this level. One example is in underground mining in which water penetrating into the adits is pumped up to the surface.

Self-priming pumps are used in various industrial and commercial facilities, from steel mills, power plants, and sewage treatment facilities to wineries, breweries, and more. Common applications include: Pumping water, fuels, clear or gray water, raw sewage, industrial wastewater, and more. Liquid transfer systems.

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The motor used to power a centrifugal pump needs to be able to produce enough torque to start the pump and bring it to an optimal operating speed. If a motor lacks enough torque to operate a pump, the pump may not start or may only operate at a reduced speed. The centrifugal pump suppliers at PumpWorks will guide you through the pump motor selection process.

A pump’s torque-speed curve is used to determine the appropriate motor to match with it. A pump’s torque-speed curve is produced by plotting the percentage of full load torque (FLT) vertically against the percentage of full load speed (FLS) plotted horizontally. An example is shown below.

The torque-speed curve is similar for all centrifugal pumps due to simple math: the pump torque varies as the square of its speed. However, when the pump is at rest—0% full load speed—the full load torque is never also 0%. Starting a rotating pump requires the motor to overcome the pump inertia and static friction.

To overcome pump inertia and static friction, approximately 20% of full load torque is required. As the pump’s speed increases, the required torque gradually declines. For example, at about 15% full load speed the required torque typically is around 5% or 10% full load torque. As shown below, the pump torque-speed curve follows the square law:

Like pumps, motors produce a torque-speed curve of their own. By overlaying the torque-speed curve of a pump and a motor, one can verify that the motor is producing enough accelerating torque to drive the pump to full speed, as shown below.

In this overlay the shaded area reflects the accelerating torque available from the motor to drive the pump. Where the two curves intersect is the point at which the motor’s torque is insufficient to drive the pump any faster. In other words, this is the point of maximum pump speed while powered by this motor.

Torque at zero flow is especially important for pumps with axial flow (or propeller) designs. The torque-speed curve of such pumps is such that the highest HP, and therefore the highest torque, is required at zero flow. An axial-flow pump must be paired with a motor with adequate HP to get the pump moving.

Another important factor in motor selection is the pump’s inertia value at the motor shaft. Inertia is a measure of an object’s resistance to movement change. The higher the pump inertia, the longer the motor will take to start the pump and bring it to full load speed.

This is significant because motors draw current to bring pumps up to speed. The longer a motor takes to overcome a pump’s inertia, the more heat it will generate. A motor must be sized to handle the pump’s inertia to avoid damaging the motor’s windings.

If a motor directly drives the pump, the values of the pump and pump-motor coupling inertias are the same regardless of pump speed.  If the pump is driven by a gearbox and motor, however, the gearbox can have a major impact on inertia values. In this application inertia can be expressed as:

A gearbox’s effect on inertia can be understood by analogy to a bicycle. When a bicycle is ridden at high speeds, the rider may change to a higher gear ratio (one greater than 1.0) to go faster. Such a ratio also requires the rider to put in more effort. Likewise, if a gearbox shifts to a higher gear ratio, the motor will have a higher load. The same logic applies if the gearbox is reducing the motor speed to drive the pump slower. When the gearbox ratio is less than 1.0, it will reduce the load requirements on the motor.

Selecting the right pump and motor for a specific application can be a complex job. The team at PumpWorks is dedicated to finding pump solutions that meet the exact needs of each customer.