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Technical

PRECAUTIONS


DO' S:


  1. Always rest the pumps on NRV.
  2. Check the water quality before filling in the motor.
  3. Always suspend the pumpset at least 3 mtrs. above the bottom of the bore.
  4. The pumps must be installed 1 mtrs. below the water level surface.
  5. Always check the cable joints and vertical play after coupling the pumpset.
  6. Run the pumpset until pure water comes out.
  7. Always use a good quality control panel.
  8. Bending of cable must be avoided


DON' T' S:


  1. Don't run the pump if any of the following defects are observed.
    • Water is sandy or acidic.
    • If there is no water.
    • If discharge valve is closed for more than 4 minutes.
    • If the problem of single phasing arises.
  2. Don't pull the motor with the help of cable.
  3. Minimum interval between the start and stop of the motor must be 1 minute.


INSTALLATION

TROUBLE SHOOTING CHART
Sr No. Problem Cause Suggested Remedy
1 Pumps does not starts. 1. Starting panel defective

2. Overload protection out

3. Fuse blown off.

4. Low line voltage
1. Replace by new starter and check for continuity.

1. Set relay properly.

1. Replace with correct rating.

1. Use adequate size cable.
2. Wait till voltage recovers or contact electricity board.

2 Fuse blows when
motor is running
1. Incorrect voltage or inadequate power supply.

2. Overheated overload protection box.


3. Defective control panel components

4. Damaged motor cable or winding.


5. pump becomes sand locked
1. Stabilise the voltage to rated and wait for adequate power supply.

1. Overload relay to be replaced or adjusted to higher value.
2. Replace starter if trips repetitively.

1. Defective electrical components to be replaced.

1. Check continuity in cable and wiring. Replace the cable. Rewind the motor if required.

1. Remove dismantel and clean water passages inside the motor. Change the motor thrust pad if required.

3 Pumps operates but
delivers little water.
1. Motor running lower than raled speed.

2. Strainer / impeller / stage casing may be clogged.


3. Defective rising main (leakage)

4. System resistance of the pumpset is higher than estimated.


5. Yield of the bore is not sufficient.


6. Damaged pump parts.
1. Check voltage / frequency. Replace cable with higher size if necessary.

1. Dismantels the pump and clean strainer and water passage of impeller and stage casing if necessary replace them.

1. Check the piping joints for leakage / choking.

1. Replace pipes with higher size.
2. Replace the pumpset with higher size.


1. Lower the unit further if possible or throttle the sluice valve adjusting to flow rated.

1. Replace correct components e.g. Impeller / Diffuser / Bushes / Sleeves / Neckring etc.
2. Check slit / sand content of water to avoid premature wear.

4 Pump does not deliver
any water.
1. Water level in borewell may have gone below level of pump.


2. Total head of the system is higher than designed head of pumpset.


3. NRV sand blocked / Wrongly connected NRV on delivery pipe.


4. Motor does not start.



5. Motor starts but doesn't pickup the rated speed.

1. If possible lower the unit further
2. Stop the unit until water level rises sufficiently.
3. Operate the pumpset with throttle valve.

1. Replace with suitable pumpset for higher head.
2. Ensure that flow is not obstructed due to foreign bodies in valve or inferior quality of valve.

1. Check the flow direction arrow on the NRV body connect correctly.
2. Check for sand blockage clean and replace.

1. Chek cable connection.
2. Check for correctness of incoming power supply.
3. Check for backup protection.

1. Check voltage / frequency. Replace cable with higher size if necessary.

5 Fuse blow off or circuit breaker trips when motor is started 1. Defective control panel
a) Defective wiring.
b) Incorrect fuse component.

2. Defective relay.



3. Damaged motor winding or cable.

4. Pump is sand locked.


5. Pumpset might have blocked in crossed well.

6. Pump and motor not coupled properly

1. Repair / replace as per instruction.



2. Replace and reset the starter only for checking the current drawn. Make sure that abnormal current is not drawn.

1. Rewind motor / replace cable.

1. Remove, dismantel and clean water passages inside the pump and ressemble.

1. Move the unit and put straight and then strat otherwise shaft would have bend.

1. Check and realign coupling and see freeness

6 Fluctuating Motor Current. 1. Check water level or system leakage.

2. Foreign object between casing ring and impeller or bearing parts inside pump.

3. Abrasion of thrust and bush bearing inside motor.

1.Replace damaged pipe or repair leaks. Lower down the pump to get water

1. Take out the pump and repair



1. Take out and replace the worn out components.



CABLE SELECTION CHART FOR 415 V, 3Ø SUBMESIBLE PUMP SETS.

Sr. No. H. P. Max. Current In Amp. Cable Size In Sq. mm. 1.5 2.5 4.0 6.0 10.0
1. 1.00 3.00   160 230      
2. 1.50 3.75 TOTAL 160 230 290    
3. 2.00 4.50   160 270 450 670 1160
4. 3.00 5.50 CABLE 110 180 280 465 800
5. 4.00 7.50   85 135 210 315 615
6. 5.00 9.00 LENGHT 70 110 170 250 525
7. 7.50 11.00   50 90 150 230 500
8. 10.0 15.0 IN   70 130 210 480
9. 12.5 20.0     50 100 180 450
10. 15.0 25.0 METER     80 155 425
11. 17.5 30.0       60 130 400
12. 20.0 35.0       40 100 370

Note: The cable length given here are from Electricity Pole to the Electric Motor

CABLE SELECTION CHART FOR 230 V, 1Ø SUBMESIBLE PUMP SETS.

Sr. No. H. P. Max. Current In Amp. Cable Size In Sq. mm. 1.5 2.5 4.0 6.0 10.0
1. 0.50 4.50   75 125      
2. 0.75 6.00 TOTAL 60 100 150 275 475
3. 1.00 7.00 CABLE 50 80 150 250 440
4. 1.50 9.00 LENGHT 40 70 110 150 290
5. 2.00 12.00 IN 30 60 90 120 150
6. 3.00 18.00 METER   50 80 100 130
7. 4.00 24.00       70 80 100

Note: The cable length given here are from Electricity Pole to the Electric Motor

Friction Losses Per 100m of ordinary Water Pipes
TECHNICAL DETAIL
FRICTION LOSSES PER 100M OF ORDINARY WATER PIPES
Capacity Diameter mm and inches
m³/h 1 / min
½" ¾" 1" 1¼" 1½" 2" 2½" 3" 4" 5" 6"
16 20 25 32 40 50 65 80 100 125 150
0.6 10 9.91 2.41 0.78                
0.9 15 20.11 4.86 1.57 0.42              
1.2 20 33.53 8.04 2.59 0.68 0.34            
1.5 25 49.93 11.91 3.83 1.00 0.51            
1.8 30 69.34 16.50 5.27 1.37 0.70 0.22          
2.1 35 91.54 21.75 6.94 1.81 0.92 0.29          
2.4 40   27.66 8.82 2.29 1.16 0.37          
3.0 50   41.40 13.14 3.40 1.72 0.54 0.16        
3.6 60   57.74 18.28 4.71 2.37 0.75 0.21        
4.2 70   76.49 24.18 6.23 3.13 0.98 0.28 0.13      
4.8 80     30.87 7.94 3.98 1.25 0.36 0.16      
5.4 90     38.30 9.82 4.92 1.55 0.44 0.20      
6.0 100     46.49 11.90 5.97 1.87 0.54 0.24      
7.5 125     70.41 17.93 8.96 2.80 0.80 0.36 0.10    
9.0 150       25.11 12.52 3.90 1.12 0.50 0.14    
10.5 175       33.32 16.66 5.17 1.48 0.67 0.18    
12 200       42.75 21.36 6.62 1.90 0.85 0.23 0.08  
15 250       64.86 32.32 10.03 2.86 1.28 0.35 0.12  
18 300         45.52 14.04 4.00 1.79 0.48 0.17 0.07
24 400         78.17 24.04 6.82 2.05 0.82 0.29 0.12
30 500           36.71 10.40 4.62 1.25 0.44 0.18
36 600           51.84 14.62 6.50 1.75 0.62 0.26
42 700             19.52 8.69 2.34 0.83 0.34
48 800             25.20 11.18 3.00 1.06 0.44
54 900             31.51 13.97 3.76 1.32 0.55
60 1000             38.43 17.06 4.59 1.61 0.67
75 1250               26.10 7.01 2.45 1.02
90 1500               36.97 9.89 3.46 1.44

Discharge Rate (Gallons per minute)
Horizontal Distance "x" In Inches Normal pipe diameter "D"
1" 1¼" 1½" 2" 2½" 3" 4" 5" 6"
4 5.7 9.8 13.3 22 31 49 83 130 190
5 7.1 12.2 16.6 28 39 61 104 165 240
6 8.5 14.7 20.0 33 47 73 125 195 286
7 10.0 17.1 23.2 39 55 85 146 230 335
8 11.3 19.6 26.5 44 62 98 166 260 380
9 12.8 20.0 29.6 50 70 110 187 295 430
10 14.2 24.5 33.2 56 78 122 208 325 475
11 15.6 26.0 36.5 61 86 134 229 360 525
12 17 29 39 66 94 147 250 390 570
13 18.5 31.0 43.0 72 101 150 270 425 620
14 20.0 34.0 46.5 77 109 171 291 450 655
15 21.3 36.3 49.6 83 117 183 321 490 710
16 22.7 39.0 53.0 86 125 196 333 520 760
17 24.1 41.5 56.3 94 133 208 353 555 810
18 25.5 43.7 59.6 99 140 220 374 590 855
19 27.0 46.2 62.9 105 148 232 395 620 905
20 28.4 48.8 66.2 111 156 244 416 650 950
21 29.8 51.0 79.5 116 164 256 437 685 1000
22 31.2 53.5 72.8 122 172 269 457 420 1050
23 33.7 55.9 76.1 127 179 281 478 750 1095
24 34.1 56.3 79.4 133 187 293 499 780 1140
25 35.5 60.7 82.7 138 195 306 520 815 1190
26 36.9 63.2 86.0 144 203 318 541 845 1235
27 38.3 65.5 89.3 149 211 330 561 880 1285
28 39.8 68.0 92.7 155 218 342 582    
29 412 70.5 96.0 160 226 354 603    
30 42.6 72.9 99.3 166 234 367 624    
31     100.3 171 242 379      
32     106.0 177 250 391      
33     109.0 182 257 403      
34     113.0 188 265 415      
35     116.0 194 273 426      
36     119.0 199 281 440      

Example:
Horizontal Distance "x" =20"
Nominal pipe Diameter "D" =2"
Discharge Q = 111 GPM
For Conversion of Gallons Per Minute To Litres Per Seconds
111GPM= 111χ4.54 8.40 LPS
60