This page contains many applets that can help you do calculations and diagnose problems with your centrifugal pumps to SAVE YOU TIME. All these applets have integrated help menus, see DISCLAIMER at bottom of page.
To run these applets you need to install on your computer the Java 2 Runtime Environment SE 1.4 available from Sun Microsystems and allow the Java Plugin to be installed. You should also have Internet Explorer version 6 installed and you may have to disable any popup blocker software. If you only see a grey box, the applet is not running, it is possible that you do not have the right java software. Some companies will not allow pure java software to run on their computers which will stop these applets from loading. 
1. Calculate N.P.S.H.A. This applet will help you calculate the N.P.S.H.A. (Net Positive Suction Head Available) to your pump. You can then check the pump performance curve to see if it is sufficient for your pump to operate properly. There are two ways to do this calculation, one involves knowing the tank level and the friction loss in the suction piping and the other requires a pressure measurement at the pump inlet. ENJOY! Click on the image to start. 
This image and others below in the same style come from a wonderful book called Slurry Pump Basic published by Svedala, a major pump manufacturer 
2. Predict Cavitation This applet is based on experimental trials done by Dr. D. Thoma that were designed to investigate the conditions that produce cavitation. Cavitation depends on the specific speed and the suction specific speed, these in turn depend on the flow, the head and the rpm of the pump. All the calculations are done for you. Is your pump cavitating? This applet will help you determine this. ENJOY! Click on the image to start. 

3. Predict centrifugal pump efficiency This neat applet helps you do power calculations prior to the selection of the pump from a manufacturer's catalog. Save time in the initial phase of the project and calculate power requirement prior to the final pump selection. Alternatively, compare the efficiency of the final pump selection with the industry average. 

5. Calculate the mass flow rate of solids suspended in a liquid If you transport solids in a liquid via a pumping system you need to know how many tons per hour of solids are being displaced. This applet will help you calculate this based on the volumetric flow rate and other factors. 

6. Affinity laws  Calculate a new impeller diameter or speed for a new flow rate The affinity laws can be used to calculate a new impeller diameter for a new flow requirement. If you are contemplating a permanent flow reduction, reducing the impeller diameter will allow your pump to run smoothly and more efficiently. This applet will help you do these calculations. Alternatively calculate what speed is required while keeping the diameter constant for a new flow requirement. In short the affinity laws are great, use them! 

7.1 Calculate total head of a centrifugal pump with pressure measurements It's a long process to calculate the total head of a pump and you need allot of information. Fortunately it is quite easy to measure the pressure at the pump outlet and inlet and then calculate the total head. This applet helps you do this calculation. 7.2 Calculate the pump power with motor current Motor amps are easy to obtain as most installations have ammeters installed on the motor control panel. You can calculate the power consumed by the pump with the amperage reading of the motor and therefore determine the mechanical status of the pump. You can use this applet and the data provided to help you with this calculation. 

8. Pipe friction loss for pulp suspensions This applet will be useful for people who work in the pulp and paper industry. Pulp suspensions are a special class of non newtonian fluids. Depending on the consistency, the friction factor can be much greater than that of water. The applet will help you calculate the friction factor (feet/100 feet of pipe) for each type of pulp suspension. It will also rank them in order of high to low friction. This method can only be used for pulp consistency higher than 2% and less than 6%. Two percent consistency pulp is considered to have the same friction factor as water.


9. Viscosity correction factors for centrifugal pump water performance characteristic curves This applet will help you calculate the correction factors to apply to the performance of a pump with a viscous fluid when the water performance is known. The applet will help you calculate the three correction factors to apply to head, flow and efficiency. This calculation is based on research conducted by the Hydraulic Institute www.pumps.org. 

10. Minimum pump inlet submersion to avoid vortex formation in the suction tank This applet will help you calculate the minimum submersion of a pump's inlet pipe in the suction tank to avoid the formation of a vortex and therefore air entrainment in the pump which would reduce the pump's capacity. 

11. Impeller erosion  Calculate the impeller tip speed to avoid excessive erosion due to solid particles in suspension The applet helps you calculate the tip speed of the impeller. When pumps get large, impeller tip speed can become an issue in terms of excessive erosion due to abrasive particles. This is especially prevalent in the mining industry where very heavy concentrated abrasive slurries are handled on a regular basis. The Hydraulic Institute has issued guidelines on maximum tip speed to avoid excessive erosion. These guidelines are clearly shown in the applet. 

12. Calculate the pressure anywhere within a pump system Often one needs to know the pressure at a specific location in a pump system, this applet is designed to help you do this. It may be at the inlet of a control valve, or maybe at the high point of the system. One critical location is the pump inlet, this will allow you to calculate the N.P.S.H.A. of the system. 

This applet will tell you how much friction loss the fluid will produce at a certain flow rate for a given pipe size, pipe roughness and flow rate (Newtonian fluids only). 

14. Maximum allowable piping pressure This applet will help you calculate the maximum allowable pressure in pipe according to the ASME pressure piping code B31.3. 

15. Pipe fittings friction loss This applet will help you calculate pipe fittings friction loss according to Crane Valve Co. Technical Paper no.410. 

16. Pipe size economic analysis This applet will help you decide the pipe diameter based on a comparison of pump power costs and pipe installation costs. Size pipes properly now, once they are installed it's too late. 
Disclaimer: We are confident that these programs work as intended, however, we cannot be held responsible for any negative consequences of their use. You may check the results at all times, a practice I encourage since the answers can be easily calculated with the formulas provided either directly on the program display or in the Help menu.