How to choose a suitable pump

Nov. 04, 2024

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How to choose a suitable pump

The pump is used to transport water. It will help you, whether you need to supply the family house with water from a well or borehole, or you need to irrigate the garden with water from a stream or drain a flooded basement.

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It is important to choose the right type of pump for the intended application in order to achieve the desired result. Each pump is designed for a different type of pumping. With a clean water pump, you will not be able to pump faeces out of the sump, and a pump suitable for water with abrasives will not have optimal properties for pumping clean water into the house. To obtain the ideal hydraulic properties (flow rate and delivery height) of the pump and at the same time excellent energy efficiency, it is necessary to choose the right type and according to the technical parameters the right pump.

Types of pumps

Submersible pump
Surface pump
Wastewater pump
Circulator pump
Swimming pool pump
Pressure booster pump

Pump for every application

You have already selected the type of pump, now focus on its technical parameters.

In order for the pump to meet your needs, it is necessary that its technical parameters, especially hydraulic ones, are optimally selected. Below you will find an overview of the most used parameters that will help you to properly size your pump.

It is also important to mention that maximum flow or head values are often used, but the maximum flow value is at zero (no) head and the maximum value of head is at zero (no) flow. At these maximum values, the pump will never be able to work. It is always necessary to find the so-called working point of the pump when the ideal value of the flow and head for which the pump was made.

Optimum flow rate

The pump flow rate indicates how much the pump can pump fluids over a given period of time, most often you will encounter m3/hour or l/min. Manufacturers indicate the maximum flow rate, that is, the value that can be achieved at zero head. In normal operation, due to head and pressure losses, the pump flow rate will be lower. The higher the head, the lower the flow rate and vice versa. For garden irrigation, you can do with flows up to 2 m3 / hour, for the supply of drinking water to the household using a home waterworks or with the simultaneous use of water in the house and garden, the output should be over 3 m³ / hour with sufficient pressure. In case you are looking for a solution for an irrigation system with several outlets, high pump performance is a must to ensure sufficient pressure and water supply at all outlets at the same time.

Conveying height

After determining the flow, it is necessary to take into account from what depth and distance you will pump the water and not forget about the length of the supply pipe. This parameter represents the conveying height or pump head . Add up all the heights from the water source to the outlet and add a loss of 1 m in height for every 10 m of pipe length. If you want to supply water to a family house, it is necessary to add the required pressure &#; 1 bar = 10 meters of altitude. As a rule, one model type of pump offers several variants, which often differ in the required head.

Fig. Example of hydraulic curve of pumps Pump AD. Dealer is looking for a pump with such a curve on which your desired power is located at a given head.

Maximum immersion depth

Cheaper pumps are often limited by a depth of immersion of max. 20 m. With some pumps you will not even find this value. The deeper the drilled well, the more important this parameter is. A deep well pump with a maximum immersion depth of 20 meters will not prove you much use with a borehole with a depth of 30 meters.

Power and input

You will certainly be interested in the energy consumption for your chosen pump. A high-quality deep-sea pump with a flow rate of over 3 m3/h and an output of 0.37 kW can be purchased at the same or lower prices as a pump with an output of more than 1 kW.

Borehole diameter and proportion of impurities

The width of your well is a given, so adjust the size of the pump. The most common are 3" and 4" pumps for boreholes with a diameter of 100 mm or more. Similarly, models are available for wells with a higher content of sand in the water, etc. When choosing the size of the pump, it is also necessary to ensure sufficient space in the borehole in the so-called ring and prevent clogging of the borehole with rhinestone or other dirt.

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7 Essential Variables For Pump Selection

You&#;ve probably heard the saying that less is more. Well, that&#;s not always true. When it comes to selecting a pump more information is better. Several variables play a direct role in how long a pump will last and how it'll operate. If you aren't sure about how to select the right pump, or what information you should know before contacting a vendor, you're not alone! We've put together a list of 7 things you should know when selecting a pump to help guide you through the process.

1. Process Liquid Properties

What type of liquid is the pump intended for? Below are process liquid properties that must be considered before selecting a pump.

Liquid viscosity
Temperature
Specific gravity
Vapor pressure
Solids present & concentration
Shear sensitive
Abrasive or Non-abrasive

2. Materials of Construction

What materials of construction are compatible with the process liquid or any other liquids the pump might come into contact with? Chemical compatibility charts are available to help you identify the most appropriate materials of construction for the pump.

3. Is the Pump Critical to Plant Operation?

In critical applications, where downtime is NOT an option, more expensive, heavy-duty pumps with special features can be chosen. If pumps can be removed from service for maintenance, less expensive options could be considered.

4. Pump Inlet Conditions

You don&#;t want to starve a pump. System Net Positive Suction Head (NPSH) available is calculated by knowing pump inlet pressure and liquid vapor pressure. Always make sure NPSHA exceeds pump Net Positive Suction Head (NPSH) required.

5. Pump Environment

If your pump will be outside, special construction or installation considerations may need to be made for freezing temperatures. If the environment is hazardous, contains explosive vapors or dust, special motor features will be required. These are just a few examples of environmental conditions to consider.

6. Power Source Availability

The most common power source in the United States is 115-230 Volts/60 Hertz/1-phase or 230-460 Volts, 60 Hertz/3-phase. Special motors can be specified for operation outside of the United States or by using DC batteries. Compressed air or pressurized hydraulic oil can also be used for power.

7. Flow Rate and Pressure

Your total volume and knowing how much time you have to move the fluid will determine flow rate. Pump differential pressure can be calculated by knowing pipe size (length & fittings), static lifts, and system equipment (filters, valves, etc.) friction losses.

By understanding the above factors, you're arming yourself with the knowledge necessary to select the right pump. No matter the application, you can feel confident with your next pump selection!

Contact us today for assistance with pump selection, or general questions concerning pumps and other fluid handling equipment. Our staff of degreed Engineers are happy to provide technical assistance to businesses in Wisconsin and upper Michigan.

If you want to learn more, please visit our website Magnetic Drive Pump.