Dewatering Pumps

Dewatering is no more about removing excess water from one place or another, it has lot of other challenges like… dewatering sites are generally open to sky, prone to large amount of mud & debris & are often unmanned. Pumps need to be moved to multiple locations & thus need to be easily portable. Pumps movement, fitment & electrical connections are often done by unskilled labourer & thus pumps are prone to damage during its movement or faulty electrical connections. Many a times due to ignorance, omission or un foreseen emergency pumps are put in to operation directly on main supply without using control panel in between. Due to this, pumps are generally exposed to erratic power supply, whether used on electrical supply or supply through genset. Due to all these uncertainties site engineers have to live with frequent breakdown of pump sets due to dry running, single phasing or mechanical jamming.

Worry no more… Darling Pumps, today has one of the widest range of dewatering pumps, which comes with many unique built-in protections to overcome above challenges…We understand water better, so we handle it better, water of various types & qualities.

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DJ Series Pumps
Features
Inbuilt Controller – All DJC pumps between 3HP to 10HP are equipped with built-in protection against dry running, overload mechanical jamming etc.
Impeller – Wear Resistant SS Impeller with wide passages that can can pass solid up to 25mm.
Motor – Motor capable to withstand wide voltage fluctuations, Highly efficient dry motors with built-in protection against temperature rise.
Shaft – Extra heavy duty SS Shaft not expossed to pumpage liquid.
Efficiency Restoration System – Adjustable Neckring / Wear ring to restore efficiency.
Mechanical Seals – Dual mechanical seal, independent of discharge pressure, thus providing improved seal life.
Bearing – Heavy duty ball bearing used at top and bottom ends to balancer adverse load.
Seal -Guard Protection: Additional
protection for Mechanical Seal by seal guard.
Cable Sealing – Special Leak proof cable sealing arrangement to avoid ingress of water through cable. No need to open motor for changing cable.
Moduler Design – Option of pump portion interchangability in given rating as per head/Flow requirement.
Cooling – Run-through cooling for better heat dissipation & low minimum submergence.
Applications
  • Basement Water Dewatering
  • Storm Water Dewatering
  • Pumping heavily contaminated water with Sand gravel and sludge at various construction sites.
  • Sea Water Pumping
  • Industrial Water Dewatering
  • Dam Sites & Deep Excavation
  • Micro Tunneling Projects
  • Underground Civil Projects
DJ Series Pumps
Tech. Specifications*
Rating : From 0.75 HP to 100 HP
RPM : 2900 (nominal)
Frequency : 50 HZ
Supply : Three phase- 415 V
Starting : DOL
Motor : Wet type / Dry type
Process Data
Liquid temperature : Max 40° C
Liquid Density : Max 1100 kg/m3
Suitable for liquid pH : 6 to 8
Stainer Hole Size : From 4 mm to 16 mm
Materials*
Impeller : CA – 15, CF8, CF8M
Shaft : AISI-410, SS-304, SS-316
Difusser : Various grades of CI/ AL/ SS
Wear plate : Various grades of CI/ SS
Mech. Seal Sic v/s Sic, Tc v/s Tc
DJC Series Pumps
Pump Model HP/KW RPM OUTLET / DN SIZE SOLID PASSAGE MINIMUM SUBMERGENCE (Approx.) WIDTH / OUTER DIA (Approx.) HEIGHT (Approx.) Net Weight (In Kg) (Approx.)
DJC-32+ 3.0/2.2 2900 65 8 100 270 722 47
DJC-33+ 3.0/2.2 2900 80 16 120 270 735 47
DJC-52+ 5.0/3.7 2900 65 8 100 270 722 49
DJC-53+ 5.0/3.7 2900 80 16 120 270 735 49
DJC-72+ 7.5/5.5 2900 80 8 110 270 770 62
DJC-73+ 7.5/5.5 2900 80 16 110 270 770 62
DJC-74+ 7.5/5.5 2900 100 16 150 340 808 70
DJC-102+ 10/7.5 2900 80 8 110 270 830 67
DJC-102SP+ 10/7.5 2900 65 8 110 270 830 67
DJC-103+ 10/7.5 2900 80 16 110 270 830 67
DJC-104+ 10/7.5 2900 100 16 150 340 870 80
Note: All dimensions are in millimeter (mm).
DJ Series Pumps
Pump Model HP/KW RPM OUTLET / DN SIZE SOLID PASSAGE MINIMUM SUBMERGENCE (Approx.) WIDTH / OUTER DIA (Approx.) HEIGHT (Approx.) Net Weight (In Kg) (Approx.)
DJ-1504 15/11 2930 100 8 180 390 1000 227
DJ-1506 15/11 2920 150 16 180 435 1040 227
DJ-1506B 15/11 2920 150 16 200 435 1030 247
DJ-2004 20/15 2930 100 8 180 390 1035 257
DJ-2004H 20/15 2880 100 8 180 390 1025 260
DJ-2006 20/15 2930 150 16 180 435 1080 257
DJ-2006B 20/15 2930 150 16 200 435 1070 277
DJ-2504 25/18.5 2930 100 8 180 390 1055 265
DJ-2506 25/18.5 2930 150 16 180 435 1110 265
DJ-2506B 25/18.5 2930 150 16 200 525 1100 285
DJ-3004 30/22 2930 100 8 180 390 1055 270
DJ-3006 30/22 2930 150 16 180 435 1110 270
DJ-3006B 30/22 2930 150 16 200 525 1100 290
DJ-3504 35/26.1 2935 100 8 180 390 1085 275
DJ-3506 35/26.1 2935 150 16 180 435 1130 275
DJ-4006 40/30 2900 150 16 340 545 1530 490
DJ-4006B 40/30 2955 150 16 1500 545 1560 490
DJ-5006 50/37 2900 150 16 340 545 1585 522
DJ-5006B 50/37 2960 150 16 1500 545 1610 522
DJ-6006 60/45 2900 150 16 340 545 1665 565
DJ-6006B 60/45 2960 150 16 1500 545 1695 565
DJ-7506 75/55 2965 150 16 350 545 1750 650
DJ-10006 100/75 2965 150 16 350 545 1790 730
Note: All dimensions are in millimeter (mm).
DJ Series Pumps
Options
  • DJC Pumps up to 10 HP can be offered with out Controller arrangement.
  • Option of pump with dry motor as well as oil filled motor.
  • Option of pumps with inbuilt agitator arrangement.
  • Pumps can be offered for 60 Hz.
  • Variety of MOCs to choose from.
  • Special series of pumps for pumping hot water
  • Special series of pumps for saline water pumping
Recommendations
  • Always flush the pump with clean water after use.
  • In case maintenance always use Genuine spares.
  • Ensure use of proper control panel for proper safety & running of Dewatering pumps.
  • Always ensure that pump is properly earth.
TH Series Pumps
Features
Impeller – High wear resistant SS impeller,capable of pumping abrasive liquids.
Motor – Highly efficient dry motors with built-in protection against temperature rise & moisture sensor for indication for seal failure.
Efficiency Restoration System – Adjustable Neckring / Wear ring to restore efficiency.
Mechanical Seals – Dual mechanical seal, independent of discharge pressure, thus provide improved seal life.
Bearing– Heavy duty ball bearing used at top and bottom ends to balance adverse load.
Cable – Specially designed cable gland to avoid undue stress on cable joint.
Shaft – Extra heavy duty SS shaft not exposed to pumpage liquid.
Cooling: Additional protection for Mech. Seal by seal guard.
Portable :Compact, easy to handle design ensures better reach to maximum depth.
Applications
  • Micro Tunneling Projects
  • Pumping heavily contaminated water with abrasive particles.
  • Ideal for high head pumping of contaminated liquids.
  • Mines Dewatering.
  • Bridge Building
  • Deep Excavation
  • Underground Civil Projects
TH Series Pumps
Tech. Specifications*
Rating : Up to 100 HP
RPM : 2900 (nominal)
Frequency : 50 Hz
Supply : Three phase-415 V
Starting : Star Delta
Motor : Wet type/Dry type
Process Data
Liquid temperature : Max 40° C
Liquid Density : Max 1100 kg/m3
Suitable for liquid pH : 6 to 8
Stainer Hole Size : Up to 8 mm
Materials*
Impeller : CA-15,CF8,CF,CF8M
Shaft : AISI-410, SS-304,SS-316
Difusser : Various grades of CI/ AL/ SS
Wear plate : Various grades of CI/ SS
Mech. Seal Sic v/s Sic, Tc v/s Tc
TH Series Pumps
Pump Model HP/KW RPM OUTLET / DN SIZE SOLID PASSAGE MINIMUM SUBMERGENCE (Approx.) WIDTH / OUTER DIA (Approx.) HEIGHT (Approx.) Net Weight (In Kg) (Approx.)
TH-1503+ 15/11 2920 80 8 140 485 990 248
TH-2003+ 20/15 2930 80 8 140 485 1030 260
TH-4004+ 40/30 2955 100 8 340 545 1520 490
TH-5004+ 50/37 2960 100 8 340 545 1570 522
TH-6004+ 60/45 2960 100 8 340 545 1625 565
TH-7504+ 75/55 2965 100 8 340 545 1740 650
TH-10004+ 100/75 2940 100 8 340 550 1775 730
Note: All dimensions are in millimeter (mm).
TH Series Pumps
Options
  • Option of pump with dry motor as well as oil filled motor.
  • Option of pumps with inbuilt agitator arrangement.
  • Pumps can be offered for 60 Hz.
  • Variety of MOCs to choose from.
  • Special Series of pumps for pumping hot water.
  • Special series of pumps for saline water pumping
Recommendations
  • Always flush the pump with clear water after use.
  • In case of maintenance always use genuine Spares.
  • Ensure use of proper control panel for proper safety & running of Dewatering pumps.
  • Always ensure that pump is properly earth.
TL & JL Series Pumps
Features
Impeller – Specially Designed highly efficient impeller having wide passage for solids.
Motor – Highly efficient oil filled motor, better heat dissipation & no hot spot.
Mechanical Seals – Dual mechanical seal ,independent of discharge pressure thus provide improved seal life.
Bearing – Heavy duty ball bearing used at top and bottom ends to balance adverse load.
Cable Sealing – Special cable sealing arrangement, Leak proof cable jointing to avoid ingress of water through cable.
Shaft – Extra heavy duty SS Shaft not exposed to pumpage liquid.
Cooling – Run-through cooling for better heat dissipation & low minimum submergence.
Portable– Light-weight & modular design for better handling.
Applications
  • Flood Relief Pumping
  • Industrial Water Dewatering
  • Pumping heavily contaminated water with Sand gravel and sludge at various construction sites.
  • Dam Sites
  • Bridge Builing
  • Road Builing Projects
  • Underground Civil Projects
  • Emergency Pumping
TL & JL Series Pumps
Tech. Specifications*
Rating : Up to 35 HP
RPM : 1450 (nominal)
Frequency : 50 HZ
Supply : Three phase- 415 V
Starting : DOL / Star Delta
Motor : Wet type
Process Data
Liquid temperature : Max 40° C
Liquid Density : Max 1100 kg/m3
Suitable for liquid pH : 6 to 8
Stainer Hole Size : Up to 25 mm
Materials*
Impeller : CA-15, CF8 ,CF8M
Shaft : AISI-410,SS-304,SS-316
Difusser : Various grades of CI/ AL/ SS
Wear plate : Various grades of CI/ SS
Mech. Seal Sic v/s Sic, Tc v/s Tc
TL & JL Series Pumps
Pump Model HP/KW RPM OUTLET / DN SIZE SOLID PASSAGE MINIMUM SUBMERGENCE (Approx.) WIDTH / OUTER DIA (Approx.) HEIGHT (Approx.) Net Weight (In Kg) (Approx.)
TL-34 3.0/2.2 1450 100 16 150 396 695 65
TL-54 5.0/3.7 1450 100 16 150 396 695 70
TL-76 7.5/5.5 1460 150 20 200 445 760 100
TL-106 10/7.5 1460 150 25 200 445 760 105
JL-1508 15/11 1450 200 16 250 520 1230 280
JL-2008 20/15 1460 200 16 250 520 1230 290
JL-2508 25/18.5 1460 200 16 250 520 1245 310
JL-3008 30/22 1460 200 16 380 605 1425 350
JL-3506 35/26.1 1460 150 16 335 660 1245 400
Note: All dimensions are in millimeter (mm).
TL & JL Series Pumps
Options
  • Option of pumps with dry motor as well as oil filled motor.
  • Pumps can be offered for 60 Hz.
  • Variety of MOCs to choose from.
  • Special series of pumps for pumping hot water .
  • Special series of pumps for saline water pumping
Recommendations
  • Always flush the pump with clean water after use.
  • In case of maintenance always use genuine spares.
  • Ensure use of proper control panel for proper safety & running of Dewatering pumps.
  • Always ensure that pump is properly earth.

Industries & Clientele

Slurry Pumps

Dewatering Pumps

Nonclog & Waste Water Pumps

Clear & Raw Water Pumps

Stainless Steel Pumps

Hot Water Pumps

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Dewatering Pumps

A submersible dewatering pump is one that is used for pumping out water/fluid from waste water tanks, rain water pits, mining pits, or from similar sources. These pumps allow suspended solid particles to pass though the impeller vanes. However, the particle sizes that the pump can handle will depend on the design of the vanes. These pumps are generally open or semi-open impeller. The prime mover is a sealed electric motor. A submersible cutter pump is a variation of the dewatering pump, which allows solid particles to pass through the impeller after being shred through a cutter.

Dewatering Pumps are used for a variety of applications such as Basement & Storm Water Dewatering, Pumping Heavily contaminated water with sand gravel and sludge at various construction sites, Sea water pumping, Industrial water dewatering, Micro tunneling projects, underground civil projects, Flood Relief Pumping, Mines Dewatering & many more similar applications.

Due to the modern design and manufacturing process, the motors currently in use often become hotter during operation than motors used in the past. In practice, the surface temperatures of some modern motors may reach temperatures of up to 90°C (194°F). Nevertheless, the service life of such motors is equal to or even greater than that of the old motors. High surface temperatures are not necessarily a sign that something is wrong. However, if the motor becomes excessively hot during operation, a number of causes may be at work:
i. Electrical causes: Under voltage or overvoltage, asymmetrical three-phase current, diminishing insulation resistance.
ii. Environmental impacts: High ambient temperatures, lack of ventilation or poor ventilation, high installation elevation (low air density).
iii. Mechanical causes: Too many switching cycles, flow rate too high or too low, high resistance to rotation due to damaged pump, high viscosity or density of the pumped medium, clogged or blocked pump.

If the pump is operating too far to the left on the curve, this simply means that the pump is delivering high pressure but at a flow rate that is low or non-existent. High pressure inside the pump stresses the impeller unit and thus increases pressure on the motor bearings. In the extreme case, this will cause damage to the pump and motor. If the flow rate is below the minimum flow rate required for the pump, the pumped medium may also overheat and damage the pump. For this reason, the pump must always be operated inside the lower and upper flow rate bounds. Ideally, the pump should be operated as close as possible to the point of optimal efficiency in order to ensure a long service life and in order to minimize energy consumption.

When a pump operates too far to the right on the curve, this simply means that the pump is delivering a flow rate greater than that for which it was designed. In other words: The pump is too small for the volume flow needed by the system. Operating the pump in this range may cause damage to the pump and the motor. The pump must always be operated within the lower and upper flow rate bounds. Ideally, the pump should be operated as close as possible to the point of optimal efficiency in order to ensure a long service life and in order to minimize energy consumption.

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