 Hello friends, myself, Prof. S. P. Mankani, Assistant Professor, Department of Mechanical Engineering, Walchand Institute of Technology, Svalapur. Today we are going to study the centrifugal pumps. So, at the end of this lecture, students will be able to understand the working principle of centrifugal pump and to understand the different types of heads are concerned. The hydraulic machine which converts the mechanical energy into an hydraulic energy are called as pumps. So, this is also called as a power absorbing machines. The hydraulic energy in the form of pressure energy, so if the mechanical energy is converted into a pressure energy by means of the centrifugal force acting on the fluid, the hydraulic machine is called as centrifugal pump. The centrifugal pumps acts as an inward radial flow turbine, inward radial flow reaction turbine. It's called as the centrifugal pumps acts as an inward radial flow reaction turbine. So, here we are going to study the different parts of centrifugal pumps are concerned. So, here this is particularly the inlet is going to be taken place through this particular last, we are going to be calling this as a suction pipe, this is a suction pipe and here we are providing here it is a foot wall and the strainer is provided on this particularly the part because any unwanted dirt should not enter in the pipe that is the reason we are going to be providing here as a strainer also one more like it is a filter also. So, here this is a suction part and here then it is coming as a this as a impeller part and here these are the blades of the impeller and this particular part you are going to be calling it as a eye. So, then this is a delivery pipe. So, actually in the working condition we are going to be studying this particular the centrifugal pump acts. So, here whenever this particularly the shaft is going to be connected to the motor the energy is going to be supplied to the motor electrical energy and that is converted into an mechanical energy and that mechanical energy is going to be utilized for this particular shaft and shaft is connected to this particular impeller impeller is having this particularly as a blades. So, when this shaft starts rotation when this shaft starts rotation and by that this particularly the impeller starts rotation. So, that time so whatever this is the through the suction pipe the water is going to be sucked here and before this particularly the start of the motor we are going to be fill up in the water with this particularly the complete pipe with the water that is we are going to be removing the air inside the pipe we are going to be removing the air inside the pipe by making it as priming of the pipe is this priming of this pump is concerned. So, here after removing this air inside the pump then only we are going to be starting this particularly the pump is concerned. We are using the word as a pump only sometimes we are going to be calling some of the in the general case as motor sometimes the people are calling it as a motor because motor is connected to this shaft and it is the working we are going to be calling this as a pump only in general the technical term we are going to be using as a pump only. So, here when it starts rotation when it starts rotation that time this is going to be the impeller is going to be rotated and because of that whatever the water is filled up in this particular case it is going to be throwing through this particularly the space in the casing and that water is going to be flowing through the because it does not have any space this side it is automatically throwing it in the upward direction. So, when it starts in the upward direction that time there is a vacuum is going to be created here and it is going to be sucked the further water it is going to be sucking the further water from the foot wall side. So, this is the particularly water layer we are going to be considering it here when the water is going to be sucking in this upward direction. So, once again it comes in the eye of the pump it is the eye of the pump. So, water is going to be entering that water is going to be flowing through this particularly the impeller blades. So, when it starts rotation this water is going to be throwing over this particularly the casings the water is going to be throwing because gradually this particular portion is going to be increasing gradually this portion is going to be increasing because the water is going to be throwing in each portions here and it is going to be collected here then the energy is going to be added to this water by the blade energy is going to be added to the water through this particularly blade because it's a coupled with this particularly shaft so when it is adding the energy then that particularly the mechanical energy is going to be converted into hydraulic energy and that water is going to be pushing it in the upward direction because this is the only space is available here and water is going to be pushing it in the upward direction so then this water is going to be coming through this particularly delivery pipe this process is going to be continued means initially only you are going to be making a priming and after that once you start the motor then this particular what is going to be suction up this water is going to be taking place through this suction pipe and then water is going to be continuously pumping in the upward direction so here these some of the terms we are mentioned in this particular last those terms are going to be studying in detail in the next step so here this is called as a from this particular position up to the eye position you are going to be calling this as a suction head means the water is going to be take this pumping from this particularly the sump from that particular level up to this eye you are going to be calling it as a suction head and this particularly from eye up to the delivery point up to the delivery point of the overhead tank is concerned up to the delivery point of the overhead tank we are going to be calling this as a delivery head is concerned and this combination you are going to be taken as a total head is concerned this is we are going to be taken this as a total head is So this particularly pump we are going to be calling it as a power absorbing machines. So this what exactly the this delivery head suction head and the total head we are going to be studying in the next bit is concerned here the definition of heads of a centrifugal pump. So this is suction head I am discussing this particular as a suction at this particular point from the water level up to this particularly the eyesight. This particularly the position of a eye of the pump is concerned from this particular position to this particular position this we are going to be calling it as a suction head. So here it is a vertical height of a center line of the centrifugal pump vertical height from the center line of the centrifugal pump above the water surface in the tank above the water surface in the tank or pump from which water is to be lifted as shown in the figure from which the water is going to be lifted from this particular position up to this one we are going to be calling this as a suction head representing as H suffix S. So next is delivery head. So here in this particularly case delivery head is from this particular point up to this the level of the overhead tank is concerned. So it is called as the vertical distance between the center line of the pump vertical distance between the center line of the pump and the water surface and the water surface in the tank to which the water to which the water is delivered is known as a delivery head. Okay from this particular point up to the delivery head we are going to be calling this as a delivery head and this is representing with the H ed is concerned. So this is the static head we are going to be calling this as a next as a static head this is H that is a H s is equal to H s plus H d H s plus H d H s is suction head and this is a delivery head totally are going to be calling it as a H s that is the static head. So these are the different definitions you are going to be using in the centrifugal pump is concerned. See let me know how we are going to be purchasing the pump even if you required for your household is concerned. See my question is if you want to purchase a pump to your house how exactly you are going to be deciding it just you think it say while you are deciding a pump for your house you are expected as how much height is situated your water tank is concerned and where the source of water is there that height as well as the height of that particular location of the pump you are expected to fix and then the height of the water is delivered. So that you are going to be calculating based on that you are going to be deciding the what type of the pump you are expected to purchase what is the capacity of the pump is concerned how much head you are expected so that you are going to be deciding based on the height is concerned that is nothing but a height. So here actually the working we are going to be observing here how the suction is going to be taken place and this is a impeller is going to be rotated just the water is entering in the suction pipe and it is rotated and this due to the position of the impeller the water is going to be flowing in the upward direction as you can observe this is throwing outside on the casings and that water is going to be flowing through this particularly as a delivery pipe this is suction then it is going to be rotated in this way impeller impeller is throwing the water through this particularly casing then it is going to be in the wing of upward direction. So this is a part of impeller is just as a part of impeller just the line diagram I am showing it here and this is a volute. Volute is reducing the casing is going to be reducing in this direction and because of that the water is going to be flowing in the upward direction. You can just observe it. This is electrical motor coupled with this particular impeller through the shaft. Then start this motor this is going to be pumping. Water is entering at the eye of the impeller. This called as a eye. This is for understanding purpose shown in this direction. Otherwise you can take it in the downward direction also this particular suction pipe is concerned. This is one more as a manometric head. The manometric head is defined as the head agonist which the centrifugal pump has to work. It is denoted by HM. This is one important term based on this one you are going to be persuasing even a pumps are concerned. How much manometric head you required based on that one the pump capacity is going to be considering it. Terms you are going to have the different terms are concerned manometric efficiency. It is nothing but a manometric head divided by the head imparted by the impeller to the water. This detail is not particularly as expected in this level of study is concerned. Just for information you are going to be considering it. This is a mechanical efficiency. The power of the impeller divided by the power at the shaft. This is one more term as overall efficiency is concerned. So it is defined as ratio of the power output of the pump to the power input of the pump is concerned.