pump and motor 1

[Thuba]

Goodday,
l have a pump rated 5 5KW/2900rpm and l plugged 3.7kw/ 2875rpm motor. Will this damage the motor or pump?

 

[Thuba]

Your not using like terms, the pump from India is more than likely Imp gpm and you're using 3960 that is used for USgpm.

l converted from 9m3/h on the pump nameplate to gpm.

 

[Artisi]

Looking at the flow and head on the pump plate, we can assume this is probably performance at its BEP, calculating the power required at this point based on a hydraulic efficiency of 50% equates to ~ 2Kw.
If the pump is now installed for a lower head, the flowrate will be higher, efficiency lower and require more power.

 

[Artisi]

l converted from 9m3/h on the pump nameplate to gpm.

Igpm or usgpm?

 

[Thuba]

In addition, we don't know the SG of the fluid being transported.

its edible oil with S.G.=0.92

 

[Thuba]

Igpm or usgpm?

usgpm

 

[Thuba]

You havent said what supply voltage this motor is hooked up to - it should be 440V or thereabouts, else you'll burn the motor

Another reason motor may be smoking because winding insulation has failed?

l measured the average voltage using a multimeter and it was 388V

 

[Artisi]

its edible oil with S.G.=0.92

And it's viscosity?

It's like squeezing blood out of stone getting usefull data.

 

[Artisi]

l measured the average voltage using a multimeter and it was 388V

That results in higher amps.

 

[Thuba]

Managed to get qvc people on whatsapp number. Here is their response:

"At duty condition it is about 38% maximum for this pump is 58% approx."

Just wondering how they obtained the 38% on duty point, meanwhile we calculated it as 17.3%. Not sure if the head in the equation will include system head too!

 

[Artisi]

Managed to get qvc people on whatsapp number. Here is their response:

"At duty condition it is about 38% maximum for this pump is 58% approx."

Just wondering how they obtained the 38% on duty point, meanwhile we calculated it as 17.3%. Not sure if the head in the equation will include system head too!

What duty?, the Q / H stamped on the pump name plate.

 

[Artisi]

How about you tell us what the operating flow and head is for the system your pumping on.
At the moment noboby has a clue as to what is going on plus you just keep dropping in random not necessarily connected pieces of information.

It's pretty simple actually, even if just reasonably close approximation.
1 Head
2 Flow
3 SG
4 Viscosity
5 temp
This will help in getting somewhere near to the problem.

 

[Thuba]

What duty?, the Q / H stamped on the pump name plate.

 

[Thuba]

How about you tell us what the operating flow and head is for the system your pumping on.
At the moment noboby has a clue as to what is going on plus you just keep dropping in random not necessarily connected pieces of information.

It's pretty simple actually, even if just reasonably close approximation.
1 Head
2 Flow
3 SG
4 Viscosity
5 temp
This will help in getting somewhere near to the problem.

sg=0.92, Flow =9m3/h, temp =110-120Deg C, head =40m, viscosity -unknown (soybean oil)

 

[LittleInch]

sg=0.92, Flow =9m3/h, temp =110-120Deg C, head =40m, viscosity -unknown (soybean oil)

Thuba,

I'm really struggling to believe that those numbers you wrote are the ACTUAL OPERATING CONDITIONS

NOT what is printed on the pump dats sheet.

 

[pierreick]

Hi,
Soybean oil viscosity @ 90 C : 8 mm2/s , it depends very much about the age and the impurities within the product..

Viscosity levels of oil products

www.lauda-scientific.de

Note: already 53 replies on this post!
Purchase a power meter (clamp) to measure the power if needed and make sure the protections of the motor are in place to prevent motor damage prior to test.
Without a PID /Isometric /curves of the pump, there is no way to get a meaningful answer, just guesses!
Pierre

 

[Artisi]

Hi,
Soybean oil viscosity @ 90 C : 8 mm2/s , it depends very much about the age and the impurities within the product..

Viscosity levels of oil products

www.lauda-scientific.de

Note: already 53 replies on this post!
Purchase a power meter (clamp) to measure the power if needed and make sure the protections of the motor are in place to prevent motor damage prior to test.
Without a PID /Isometric /curves of the pump, there is no way to get a meaningful answer, just guesses!
Pierre

Correct, crystal ball gazing and guess work for the want of a bit of useful data.