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Sealless Pump - Types, Applications, Advantages and Limitation

πŸ”— Hermetic, semi-hermetic and open compressor πŸ”— Working of Electromagnetic clutch What is a sealless pump? What is their importance? Some ...

Sealless Pump - Types, Applications, Advantages and Limitation

sealless pump

πŸ”—Hermetic, semi-hermetic and open compressor

πŸ”—Working of Electromagnetic clutch


What is a sealless pump? What is their importance?


Some pump applications require zero product leakage, even less than the minimal leakage possible from a well-chosen and well-maintained mechanical seal. Zero leakage is essential while handling toxic liquid. Most emissions are caused by leakages in pumps used in the industry. A number of stringent environmental and safety regulations force the industry to adopt methods that reduce or eliminate fugitive emissions in the workplace.

Applications Advantages and Disadvantages of Centrifugal Pump


Applications of centrifugal pump

Centrifugal pumps are generally high-discharge, low-pressure pumps. In this pump, the pressure head is increased by adopting multi-stage operation. The first stage increases the pressure to a certain point, and then the next step increases it even more until you reach your desired pressure. Centrifugal pumps are used in many everyday applications, such as pumps for water tankers, wastewater, industry and even emergency firefighter vehicles.

Various Types of Casing Used in Centrifugal Pump - Benefits and Limitations

casing


πŸ”—Main parts of a centrifugal pump


Volute casing

The volute casing is the most common type of casing in centrifugal pumps. Derives its name from its spiral shape. The cross-sectional area or flow area gradually increases uniformly from the tongue (impeller outlet) to the delivery pipe. The shape of the volute's cross-section can be circular, trapezoidal or rectangular, depending on the design. As the area of passage increases gradually, the velocity of fluid decreases and pressure rises in the volute casing. In other words, the kinetic energy is converted into pressure energy.

What Are the Purpose and Functions of Casing in Centrifugal Pump?

casing


  • Pump casings seal off the inside of a pump to the atmosphere to prevent leakage and retain pressure. It has provisions for fixing stuffing box and house packing material. Provide perfect pressure containment.
  • Casing guides the liquid from the impeller.
  • Casing partially converts the kinetic energy of liquid to pressure energy.

Centrifugal Pump Impeller Material For Various Applications


πŸ”—What is impeller in centrifugal pump?


When choosing impeller materials, apart from cost and abundancy, many other properties of material like abrasion and corrosion resistance need to be considered.


  • Cast iron: When it is necessary to pump clear and fresh water, the impeller is cast as a single piece and made of cast iron. This impeller type is cheaper than those made of other materials, such as brass or bronze. Cheapest option but still a good performer. It has good corrosion resistance to neutral and alkaline liquids, but not suitable for acidic liquids.

Different Types Of Impellers In A Centrifugal Pump - Their Application and Advantages

Impeller type


πŸ”—Main Parts of a Centrifugal Pump


There are three types of impellers used in a centrifugal pump.

Shrouded or closed impeller

closed impeller


In this impeller type, metal cover plates or shrouds are provided on both sides of the impeller vanes, enhancing its strength. This reduces the load on the shaft, increasing bearing life. However, its complicated design makes it more difficult to manufacture and more expensive than open impellers. These impellers typically have plain vanes with a single curvature that are curved backwards. Wider impellers have double-curved vanes with twisted suction ends. These are known as mixed flow vanes or Francis type vanes.

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