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Friday, 2 January 2015


Pumping system is very much required for transmitting the liquid from one place to other place. As per my knowledge, we use pumps in each industries for transmitting various liquids such as water or any chemicals.

Pumps are heart of the chemical industries as well as for oil and gas industries also.
Hence if we consider the cost analysis for operation of pumps, we will require pump performance curve for understanding the efficiency and productivity of pumps.

With understanding of performance curve, we will be able to select the correct size of pumps and correct delivery hoses or pipes for pumping system and we may easily transmit the large volume of liquids with better efficiency and with minimum operating and maintenance cost.

Now questions are frequently asked, why we need pump performance curve?

We need pump performance curve for understanding following points
  1. How efficient can a pump transport the liquid?
  2. How much energy will be produced by the pump for overcoming the various losses like frictional losses and other minor losses?
  3. How much power will be required by the pump for transporting the liquid?
  4. How much energy efficient the pumping system?
If we are planning to install the pumping system then we must know how much losses will be occurred in our system and what capacity of pumps will be required .Capacity of pump will be displayed on one axis of the performance curve and on other axis we will find the total dynamic head i.e. TDH. Capacity of pump will be measured in cubic meter per hour.

Also discuss,
Difference between positive and non positive displacement pump

We may easily understand the characteristic of pump and I would like to produce the basic overview of capabilities of centrifugal pump with the help of centrifugal performance curve.

Pump performance curve is the tool for investigating the behaviour of centrifugal pump
Let us understand the pump performance curve, once we will have the information of pump performance curve, we will be able to discuss the pump characteristics.

We have above two curves. First curve is termed as system curve and second one is for performance curve where we may see that there are various head as well as changes in efficiencies with respect to flow rate for various diameter of impeller.

The characteristic of pump is basically described with the help of graph known as pump performance curve by the manufacturer. The pump characteristics curve specifies the relation between head and flow rate of the pump.

Let us also look just overview of curve for turbine also, we will discuss curve for turbine  in our next post in detail , but here we must understand overview of curve for turbine.
Similarly, we will also have curve for turbine, we will compare also both curve i.e. pump performance curve and curve for turbine.

Turbine output power with respect to flow fate  

As we need more flow rate, power requirement will also be high as shown in above curve
Efficiency might also be drawn with flow rate as mentioned below. We may see easily that efficiency will increased with increment in flow rate.

So what we have concluded?

After studying this blog, we will have following information's that we have noted
Pressure depends on resistance in fluid flow. Speed depends on fluid flow. Requirement of power for turbine and for pump will be directional proportional to flow rate.
We have concluded changes as mentioned following 
  • Pump head vs water flow rate.
  • Turbine output power vs water flow rate.
  • Efficiencies versus water flow rat. 
Also look
Centrifugal fan vibration problem analysis
Basic principles of hydraulic system

Do you have suggestions? Please write in comment box 

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