Water Pump System: Choosing the Right Electrical Motor

In summary: You drive it at a speed that is within the speed limit. Summary:The system includes an electrical motor and a water pump. The motor must be selected based on its power, and the pump must be matched to the motor. The two must be in sync to run at the intended speeds.
  • #1
Eng_Luqman
19
0
Dear ...

Please Try To Read Those :

I have This System Of Water Pump Consist Of An Electrical Motor And A Water Pump For Lifting Water From An Underground To The Upground ... In A Factory Using This Pumped Water For Cooling The Iron That Produced Form The Rolling Machines ... (( Open System - To The Atmosphere )) .

And The Main Thing I Want To Know It ... Is To Be Sure Is This System Is Working Correctly With The Bellow Specifications :

Electrical Motor Specifications :

RPM = 2900
V = 380
P = 5.5 Kw
F = 50 Hz
A = 10
3 - Phase Induction Electrical Motor

----------------------------------

Water Pump Specifications :

RPM = 3600
P = 6 HP
H = 30 m
Q = 1000 L / Min.

-----------------------------------

The input and out put line of the pump = 3 inches Pipe


--------------------------------------------------------------

The thing that I want to know it exactly ... how they choosing the this Electrical Motor For This Pump ... Is That Correct ...

On What Formula They Depend ... Or On What Base They Depend To Choose This Electrical Motor For This Water Pump ...

You Can See The RPM For Both Of The E.M. And The Water P.
And How They Arrange The Both ... ?

Hope I can get the right answer and helping to understand the bases and the formulas also in details ...

Regards
 
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  • #2
Eng_Luqman said:
The thing that I want to know it exactly ... how they choosing the this Electrical Motor For This Pump ... Is That Correct ...

They are not perfectly matched. The critical parameter is power. The output power of the motor must equal the power of the pump divided by pump efficiency. For example, if the pump is 6 HP, and its efficiency 80% then it needs 6/0.8 or 7.5 HP of power from the motor. 7.5 HP = 5.6 kw. So the 7.5 kw motor is slightly larger than needed.
Eng_Luqman said:
You Can See The RPM For Both Of The E.M. And The Water P.
And How They Arrange The Both ... ?
Either the two RPM must be exactly the same, or some gears or belts are needed to change the speed. In your case, the pump probably runs at 2900/3600 or 80% of its rated speed, making the HP and L/sec lower.It sounds like you expect both motor and pump to run at exactly the nameplate values listed. The values are maximums. You probably drive a car rated at 120 mph, but you don't really drive it that fast.
 

1. What is a water pump system and why is it important?

A water pump system is a mechanical device that is used to move water from one location to another. It is important because it helps to supply water to homes, buildings, and industries, as well as to move waste water away from these places.

2. What factors should I consider when choosing an electrical motor for a water pump system?

There are several factors to consider when choosing an electrical motor for a water pump system, including the power requirements of the pump, the type of water being pumped, the size and weight of the motor, and the efficiency and reliability of the motor.

3. What are the main types of electrical motors used in water pump systems?

The main types of electrical motors used in water pump systems are AC motors, DC motors, and brushless DC motors. AC motors are commonly used for high-power applications, while DC motors are often used when precise speed control is required. Brushless DC motors are more efficient and have a longer lifespan than other types of motors.

4. How do I determine the appropriate size of the electrical motor for my water pump system?

The appropriate size of the electrical motor for a water pump system can be determined by calculating the total head and flow rate required for the system. This information, along with the specific power consumption of the motor, can help determine the appropriate size for the motor.

5. What maintenance is required for an electrical motor in a water pump system?

Regular maintenance is important for ensuring the longevity and efficiency of an electrical motor in a water pump system. This may include checking for any wear and tear, lubricating moving parts, and replacing any damaged or worn components. It is also important to keep the motor clean and free of debris to prevent overheating.

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