We have an Water Pump rated 0.25HP which used to normally pump water from ground tank to supply tank in 45 min i.e., it would pump 3000 lts(estimated) of water in 45 min. The pump got spoilt and was repaired few times. From what i remember, the capacitor was changed once and the other time the internal motor winding was rewound.
My question is, 1) What made the pump to slow down?
2) Will there be any change in power consumption of motor?
3) Has the efficiency of motor decreased?
Water is nearly clean.Not knowing if it's a submersible or ground-level pump...
1.
Is the water clean or murky? If the pump is a positive displacement type, then it may be the kind that cannot tolerate any dirt getting inside the cylinder. I don't know that this was the same as your problem.
No, but how does water getting into bearing affect?Or... did water get at the bearings? It's a remote chance. Of course we would expect it to be designed to bear up in a normal installation.
Not Dry run, the motor requires watering(i'm not getting the technical word) after every dry run.Did it ever run dry? If there are no safeguards then it might allow the motor to run fast and overheat the bearings. Afterwards it would never act right.
No, it never blowed the fuse, but i suspect once when the winding was gone, we had a trip.2.
When a motor winding goes bad, it's a good bet that it carried overmuch current and overheated.
Did it ever blow a fuse or trip a breaker?
What high pressure? i'm not getting you. Please can you elaborate?Did the system ever reach an abnormally high pressure? That would make a pump work harder, since it must overcome the high pressure.
Pump slowing down will happen if there is a variation in the power supply voltages, OR there is excessive load on the motor due possibly to build-up of dirt/ any other reason for increase in the pressure head. In addition it is not advised to run such motors "dry" - which is a bit counter-intuitive but apparently common knowledge. I suspect there is no controller on your pump, and that it often runs dry in an effort to ensure your overhead tank is full.
I still have a question, what affected motors speed/efficiency? Did that happened because of poor-quality repair (including winding and capacitor change).Rewinding is a cheaper option than buying a new motor, but once again too often the rewinding is below spec, for exactly this reason. This implies less than original power output and probably higher current draw.
No, but how does water getting into bearing affect?
Not Dry run, the motor requires watering(i'm not getting the technical word) after every dry run.
What high pressure? i'm not getting you. Please can you elaborate?
We raised the tank to 10 ft a few years ago, will that be the reason for increase in load? But, initial years, it worked well. I still suspect low quality winding.
I still have a question, what affected motors speed/efficiency? Did that happened because of poor-quality repair (including winding and capacitor change).
Also, please tell me why a capacitor is required? How can i know the pinnacle upto which the motor can pump the water?
How will the tank pressure effect? the pipe is not over head tank has no immersed water pipe. Please give me a link to read about this.There should be a sensor which detects either water level or water pressure. The sensor tells the pump to turn off and on. If the sensor gets out of adjustment then the pump might continue to run and build up overly high pressure in the system.
Is there a pressure gauge attached to the tank? Normal pressure varies between 20 and 50 pounds/sq.in. Since your pump is having problems I would not set it for more than 40.
How will the tank pressure effect? the pipe is not over head tank has no immersed water pipe. Please give me a link to read about this.
I'll check for the hotness of the pump; sound and exact time it takes to complete one cycle of filling the tank. I'll also check for sound from the bearings and for any air leaks in near the motor. I'll also try to measure the voltage at the nearby receptacle.
One thing i forgot to mention, the motor is connected to an invertor/UPS. Might that have affected anything? But, we usually use motor only on mains supply. When there's an power cut, we switch off the motor(since it overloads UPS).
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?