centrifugal pump Articles
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What’s the Difference Between a JM and JP Shaft Extension?
Close-coupled centrifugal pumps are attached directly to the face of a motor. They use the motor’s bearing and shaft, which makes these pumps more compact and economical. By contrast, frame-mounted pumps have their own bearing frame. For some applications, close-coupled centrifugal pumps are the clear best choice due to the lower cost and a smaller footprint. In this article, we are ...
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How to read a Centrifugal Pump Performance Curve
This may seem a very basic topic but if you are new to selecting centrifugal pumps it is an essential skill to know how to read a Centrifugal Pump Performance Curve. Pump manufacturers will supply a performance curve detailing the following information: flow, head, power absorbed, efficiency and NPSH required. On all curves some essential information will be shown such as the pump model, speed ...
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What is a centrifugal pump?
What is a centrifugal pump? A centrifugal pump is a mechanical device designed to move fluid by rotating energy from one or more driven rotors called impellers. The fluid enters the rapidly rotating impeller along its axis and is discharged by centrifugal force along its circumference through the blade tip of the impeller. The action of the impeller increases the velocity and pressure of the ...
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ANALYSIS OF PUMP VIBRATION AND NOISE
The principle of the centrifugal pump is simply that when the impeller rotates at a high speed, the liquid between the blades is driven to rotate. Due to the centrifugal force, the liquid is thrown from the center of the impeller to the outer edge of the impeller. The flow channel gradually expands, the liquid flow rate gradually decreases, and part of the kinetic energy is transformed into ...
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Overview of Sanitary Pump
Sanitary pumps involve the delivery of all human contact products such as pharmaceuticals, dairy products, beverages, food products, cosmetics, food additives, fine chemicals and the like. There are four types of sanitary, centrifugal, volumetric, jet and air pumps. Centrifugal pumps apply centrifugal force to create velocity, using a rotating wheel to increase speed and push fluid through the ...
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Pump Performance Curve & System Curve
We recently wrote an article on how to read the information presented on a standard centrifugal pump performance curve and to develop this further we need to examine how this relates to the system curve. So, what is the system curve? This plots the head in terms of the static head (that does not change) in addition to the pressure loss through the system that will increase as the flow rate ...
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Impeller Selection: Semi-open vs. Enclosed
Enclosed and semi-open impellers are both widely used in centrifugal pump design. While enclosed impellers are typically considered more efficient, both designs have merits and are suited for different applications. In this discussion, we will be addressing single-inlet impellers, which are typically used for end-suction style ...
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Factors affecting Pump Efficiency
The overall efficiency of a centrifugal pump is the product of three individual efficiencies: mechanical, volumetric, and hydraulic: Mechanical efficiency Mechanical efficiency includes losses in the bearings (long couples pumps), stuffing box (in the case of packed gland pumps) and mechanical seals. Volumetric efficiency Volumetric efficiency will include internal losses due to leakage ...
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The Versatility of Hydraulic Submersible Pumps
Hydraulic submersible pumps offer flexibility and performance When determining a pump for an application, there are a number of factors to consider. Hydraulic submersible pumps are an option and give the added benefit of run dry capability, especially when electric powered pumps are of concern due to potential electrical hazards or other reasons, or diesel driven centrifugal pumps are not ...
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Dangers of Cavitation in Piping Systems & How to Avoid It
Cavitation is a hot topic for engineers, maintenance professionals and anyone who works with pumping systems—and for good reason. This condition has complicated and difficult-to-identify causes, and its effects can be devastating to equipment, system integrity and overall operations. Preventing cavitation is a full-team effort when it comes to systems operated with centrifugal pumps. It ...
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Submersible Pumps vs. Self-Priming Centrifugal Pumps
When selecting a centrifugal pump for bypass work, the first consideration should be NPSHR by the pump. Neglecting the NPSHR of the pump is the single most common mistake when choosing a self-priming or priming assisted pump. A function of the pump design requires part of the 33.9 ft (14.7 in.) available as further defined in this article. A centrifugal, and in a way submersibles, require part ...
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Multiphase pumps for energy-efficient water and wastewater treatment
Multiphase pumps are unique products with outstanding features compared to conventional centrifugal pumps. The approach consists of using the pumps not only for transport of liquids but also for partial gas supply and as dynamic mixer for gas enrichment. Therefore this novel pump conception barely has something in common with a standard pump. Even the mode of operation does no longer ...
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DESMI Pumps for HVAC in Sharjah, UAE - Case Study
DESMI has supplied a series of eight NSLH End Suction Centrifugal Pumps for the Umm Al-Qura building located in Sharjah at the Al Mamzar beach. The NSLH pumps will be providing 198 differently sized apartments with cooling. The residential building has 22 floors + 5 floors for car parking and is located at the Al Mamzar beach. Sharjah is the third largest and third most populous city in the ...
By DESMI A/S
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Pumps for energy-efficient water and wastewater treatment
Multiphase pumps are unique products with outstanding features compared to conventional centrifugal pumps. The approach consists of using the pumps not only for transport of liquids but also for partial gas supply and as dynamic mixer for gas enrichment. Therefore this novel pump conception barely has something in common with a standard pump. Even the mode of operation does no longer comply ...
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EDUR Multiphase Pumps for energy-efficient water and wastewater treatment
Multiphase pumps are unique products with outstanding features compared to conventional centrifugal pumps. The approach consists of using the pumps not only for transport of liquids but also for partial gas supply and as dynamic mixer for gas enrichment. Therefore this novel pump conception barely has something in common with a standard pump. Even the mode of operation does no longer comply ...
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Synthetic dairy wash-water treatment by using an alternating pumped sequencing batch biofilm reactor
The performance of an alternating pumped sequencing batch biofilm reactor process in synthetic diary wash-water treatment was studied. The system comprises two reactors with two identical plastic biofilm modules. Two centrifugal pumps, one connected to each reactor, alternately move the water from one reactor to the other one, resulting in aeration. At three loading rates (336, 501 and 1080 g ...
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The Complete Guide to How Self-Priming Pumps Work: Benefits and Applications by DAE Pumps
Introduction Self-priming pumps have a special design that creates a vacuum within the pump casing, drawing fluid into the pump. It then circulates the fluid through the system. The design uses a special impeller with vanes that trap air and gas within the pump casing. The impeller’s rotation creates pockets that trap air and gas in the pump casing. This creates a partial vacuum that ...
By DAE Pumps
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Variable Speed Pumps
We often get asked for a pump to achieve multiple duties points. This is often seen as minimum, normal and maximum flow rates with corresponding calculated heads. This can make it quite tricky to efficiently select a centrifugal pump, as a fixed speed curve will increase flow whilst decreasing generated head. In reality the pump may very rarely see the maximum duty point and so it very rarely ...
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How to increase discharge pressure of centrifugal pumps
There comes a time in every good pump systems’ life where what once was adequate is now not good enough. The flow needs to increase, the lines get extended, or the operators just need that bit of extra momentum on the discharge. As pump experts, this isn’t the end of the world, we have several levers we can pull to help get that extra bit of pressure out of the pump and increase ...
By Global Pumps
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A Guide to Centrifugal Impellers
Centrifugal pump impellers come in many shapes and sizes, each having their own uses and advantages. There are two aspects of the impeller, regardless of the type, that are worth remembering: Impeller Diameter: The diameter of a centrifugal impeller relates directly to the head that the pump can produce. The greater the diameter then the greater the velocity of the liquid as it leaves the ...
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