Types of centrifugal pumps | Types of centrifugal pump casing

Types of centrifugal pumps

 

                                                                           Centrifugal pumps  classified into several types of depending on factors such as design construction of application service compliance with a national or industry standard  etc. There is one specific pump can belong to another  groups and at the times of  pump is known by its description itself. 

Depending on the numbers of impellers are in the pump- pumps can be classified as per the following:-

 

Single stage pump:-  A one impeller of  pump  single stage centrifugal pump has a simple design and easy maintenance. Ideal for large flow rates and these pumps low pressure installations. They are commonly used in pumping services of the  high flow and the  low to moderate Total Dynamic Head.

Two-stage pumps:- This type of pump has two impellers operating side by side which are used for medium head applications.

 Multi stage pumps :- pump has three or more impellers in series for high head service. The accompanying boss components influence the exhibition of a centrifugal pump and should be thought of while picking a centrifugal  pump:

 Working Fluid Viscosity – can be characterized as protection from shear when vitality is applied. When all is said in done, a centrifugal pump is appropriate for low consistency liquids since the  pumping activity produces high fluid shear.

 Explicit thickness and gravity of working liquid – The thickness of a liquid is its mass per unit of volume. A liquid's mass for every unit volume and gravity of a liquid is the proportion of a liquid's thickness to the thickness of water. It legitimately influences the information power required to  pump a specific fluid. On the off chance that you are working with a liquid other than water, it is imperative to consider the particular thickness and gravity since the weight will directly affect the measure of work performed by the  pump.

Working temperature and weight – Pumping conditions like temperature and weights are a significant thought for any activity. For instance - High-temperature  pumping may require uncommon gaskets, seals and mounting structures. Correspondingly, a sufficiently planned weight holding packaging might be required for high-pressure conditions.

 

Net Positive Suction Head (NPSH) and Cavitation – NPSH is a term that alludes to the weight of a liquid on the attractions side of a  pump to help decide whether the weight is sufficiently high to maintain a strategic distance from cavitation. Cavitation alludes to the arrangement of air pockets or pits in fluid, created in territories of moderately low weight around an impeller and can make genuine harm the impeller and lead to diminished stream/pressure rates in addition to other things. One must guarantee that the framework's net positive pull head accessible (NPSHA) is more noteworthy than the  pump's net positive attractions head required (NPSHR), with a fitting security edge.

 

Fume weight of the working liquid – The fume weight of a liquid is the weight, at a given temperature, at which a liquid will change to a fume. It must be resolved so as to maintain a strategic distance from cavitation just as bearing harm brought about by dry running when the liquid has dissipated.

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Infer able from the utilization in the assorted scope of uses,  pumps accompany various limits and in different sizes. You ought to likewise consider the weight and volume prerequisites of the particular tasks for which you need the  pump. The torque required is another significant thought with regards to volume and release pressure.

 

Types of centrifugal pump casing: 

Types of centrifugal pump casing                                                                                   There are basically 3 types of pump casings:                                                                                       1 value casing                                                                                                                                            2 vortex casing                                                                                                                                        3 casing with guide blade or diffuser  

centrifugal pump casing 

1 Value casing: There is an increase in the area, so its velocity increases, the

efficiency is less, due to which it is fine!

2  Vortex Casing: It consists of vortex chamber

with impeller. By centrifugal force the water is discharged from the water

chamber towards the casing.

3  Grated Blade or Diffuser Casing: Guide vanes

can increase core area. The center shock is identical without the water

impeller and casing. Without such shock, water enters the guide blade and the

water travels through the casing to the outlet.