Hi Guys,
Recently i came across an information that some manufacturers of Submersible Motors use Closed slot Stamping design in Higher kW ranges over the conventional Open slot stampings. The disadvantage of a closed slot stamping will be the delay in production as it may take upto couple of...
Hi Folks,
Hope someone can help me on the below issue,
We have installed a 250HP, 380V, 60Hz Submersible pumset at 340m deep in a Borewell . The motor is a 6 lead motor & all the 6 leads were taken out of the well & connected in DELTA as a 3 wire motor before conencting to the VFD.
After...
Hi Guys,
I would like to to know if the calculation for dimensioning a 3 Phase Auto-transformer is same as that of a power transformer
ie (Volts x Amps X 1.73)/1000 ?
i am thinking of installing a 30HP,380V pump set in 220V,3Phase,AC power supply by employing a step-up auto-transformer, so...
What is the advantage of having a 12 lead 460V,60Hz WYE-DELTA Motor over 6 lead 460V WYE-DELTA motor ? The motor is for deepwell application & mechanical type reduced voltage starter is used in both the cases.
We have a 60HP, 440V, 60Hz Submersible Pumpset installed in a borewell at 210m depth. The delivery pipe is of 6" diameter & after 15 days of operation the current of the pumping unit surged to 156A from its 95A.
After dismantling the motor we found that the thrust bearing of the motor is...
I tried to figure out the SFA of a motor using the following formula,
SFA = SF*HP/[SQRT(3)*Vll*EFF*PF]
Whereas,
SFA = Service factor Amps
SF = Service factor
SQRT(3)= 1.732
VII = line voltage
EFF = Efficiency
PF = Power Fator
Considering
SFA = 1.15*5HP / (1.732*220*0.75*0.81)
= 5.75...
Dear Experts
i have a 5HP, 220V, 60Hz 4ïnch submersible motor whose max.current(SFA) is 19.5A. It´s coupled to a borehole submersible pump and installed at 350m with a supply cable (copper)of 10mm^2. But the actual current consumed by the motor is 23A.
When contacted the supplier they informed...
I have a single phase 3HP 230V 60Hz capacitor start capacitor run submersible motor which came with a 250/300mfd, 230V rating start capacitor & 36+36mfd, 440V rating run capacitors.
As this start capacitor is defective i need to replace it but the rating of the start capacitor comercially...
Is there any relation between the overhanging portion(length) & efficiency or life cycle of a motor.
For example an motor with a less overhanging portion will be having a better efficiency than the one with a large overhanging portion?.
Helo friends throw me some light
I would like to know the acceptable tolerance levels in centrifugal pump performance as per ISO 9906 Anex 2A when compared to ISO 9906 Anex A.
Any kind of help is highly appreciated.
Dear Friends,
I would like to get a clarification in calculating friction loss in a PVC pipe of 100m length.Using the formula
hfs = 4f L/D x V*2/2 X g,
Q = 30cub.m/h
L = 100m
D = 51.4mm (ID of UPVC pipe)
Kin.Viscosity of Water @ 30deg.C = 0.801 cSt
Results i got are as follows
V =...
Helo friends throw me some light
I would like to know the acceptable tolerance levels in centrifugal pump performance as per ISO 9906 Anex 2A when compared to ISO 9906 Anex A.
I am curious about what will be the PH handling capacity of SS316 material. When pumps are made with SS304 manufacturers are recommending for a PH of 6.5 to 8.5.
Hence what will be the PH range for SS316 material.
Hi friends
Can anyone of u please tell me what will be the class of Insulation of Water filled rewindable submersible motors (Winding is made of water proof insulated copper wire). Normally manufacturers claim it as Y class?
But i have never seen anywhere the temperature ratings for Y class...
Hi Friends! i am new to this Eng.Forum.
I am working with a company manufacturing submersible pumps & i would like to know what is the difference in the electrical design between a motor with Service Factor & without Service factor, and also mostly service factor is declared for 60Hz motors &...
