Suitable submersible motor-pump specification

[subban]

Hello,

I have a bore-well drilled till 624 ft depth. there a discharge of around 1.5inch started at 380 ft and was constant till 610 ft. At 610 ft there was heavy discharge of around 3inch and driller could not drill more than 624 ft.

Having said this, can somebody suggest what would the approximate submersible motor-pump specification to lift the water?

Till what depth do we need the motor to be present?

Kindly advice me on this.

Thanks in advance
Nagendra

 

[kirti s]

Hello Sir
Select a drop cable designed for use in water.
The insulation on the conductors should be RW, RUW, TW, or their equivalent.
DO NOT compromise on drop cable quality. Paying a little more will save you money in the long run.
Cable sizes and lengths are maximum allowable. Higher operating efficiency will be obtained by using the next larger cable size when lengths approach listed limits. A
All size and cable lengths shown are for copper wire only.
Use of smaller cable than recommended will void warranty.
Select cable length equal to length of setting plus an additional 10’ or more to connect to starter at the surface, plus 1 additional foot for each 50’ of length in the well to compensate for unavoidable slack in the installation.

SURFACE PLATE
Surface place consists of flat steel plate with connection for drop pipe, hole for entrance of cable, vent hole, hole for air line or water level gauge. Surface plate is supplied (with)(without) elbow. If elbow is furnished, it can be flanged or female thread. Surface plate is selected to match drop pipe size.

MOTOR SELECTION
Motor selection is based upon horsepower required, pump RPM, thrust load, well diameter, and power supply. Also, see comments under WELL SIZE and WATER TEMPERATURE.

STARTING EQUIPMENT
Selecting the proper overload protection is one of the most important factors in obtaining a successful submersible installation. Submersible motor starters should provide the following:
< Positive motor protection against single phasing.
< Positive motor protection against sustained overload in excess of 1
15% of motor rating.
< Motor protection if rotor is stalled.
< Tripping timers independent of ambient temperature; (Ambient Compensated Quick Trip Heaters).

 

[saravanakumargcses]

Hello,

I have a bore-well drilled till 624 ft depth. there a discharge of around 1.5inch started at 380 ft and was constant till 610 ft. At 610 ft there was heavy discharge of around 3inch and driller could not drill more than 624 ft.

Having said this, can somebody suggest what would the approximate submersible motor-pump specification to lift the water?

Till what depth do we need the motor to be present?

Kindly advice me on this.

Thanks in advance
Nagendra

Dear Mr.Nagendra,

Below is how we size the pump;

A)Identify the total head
B)Identify bore dia
C)Estimate the desired water requirement in LPM/LPH
D)Match the above with the pump manufacturer's discharge curve or data

Eg: As per your info, I looked into one of the pump manufacturer's data, and result is

3ph 100mm 5hp @ head 170M gives 80 LPM
3ph 150mm 12.5hp @ head 175m gives 210LPM
and many more combinations.

Deciding the size in the above case will depend on what is my cumulative water requirement.

Also, regarding motor depth, lets take the worst case.

Bore depth 624ft, motor erected at say 400ft

Lets assume you put the pump rated for a max head 400ft.Pump shall work as long as it touches 400 after which you will have to replace the pump for a higher head pump.

The optimum depth at which the pump needs to be erected as per our experience is @ Total bore depth - 10 or 15ft.

Hope this helps.

Please PM if you need anything.

Regards,

Saravana Kumar
CEO
Greencurrent Solar Energy Systems
saravana.kumar@greencurrent.in | 9566600477

 

[enolar]

Mr.Nagendra

Please provide your contact details. We will be able to meet you and explain how this can be done and what is the most cost effective way of doing it. Please write to us on "enolar@gmail.com".