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. SealSic v/s Sic, Tc v/s Tc
DJC Series Pumps
Pump ModelHP/KWRPMOUTLET / DN SIZESOLID PASSAGEMINIMUM SUBMERGENCE (Approx.)WIDTH / OUTER DIA (Approx.)HEIGHT (Approx.)Net Weight (In Kg) (Approx.)
DJC-32+3.0/2.2290065810027072247
DJC-33+3.0/2.22900801612027073547
DJC-52+5.0/3.7290065810027072249
DJC-53+5.0/3.72900801612027073549
DJC-72+7.5/5.5290080811027077062
DJC-73+7.5/5.52900801611027077062
DJC-74+7.5/5.529001001615034080870
DJC-102+10/7.5290080811027083067
DJC-102SP+10/7.5290065811027083067
DJC-103+10/7.52900801611027083067
DJC-104+10/7.529001001615034087080
Note: All dimensions are in millimeter (mm).
DJ Series Pumps
Pump ModelHP/KWRPMOUTLET / DN SIZESOLID PASSAGEMINIMUM SUBMERGENCE (Approx.)WIDTH / OUTER DIA (Approx.)HEIGHT (Approx.)Net Weight (In Kg) (Approx.)
DJ-150415/11293010081803901000227
DJ-150615/112920150161804351040227
DJ-1506B15/112920150162004351030247
DJ-200420/15293010081803901035257
DJ-2004H20/15288010081803901025260
DJ-200620/152930150161804351080257
DJ-2006B20/152930150162004351070277
DJ-250425/18.5293010081803901055265
DJ-250625/18.52930150161804351110265
DJ-2506B25/18.52930150162005251100285
DJ-300430/22293010081803901055270
DJ-300630/222930150161804351110270
DJ-3006B30/222930150162005251100290
DJ-350435/26.1293510081803901085275
DJ-350635/26.12935150161804351130275
DJ-400640/302900150163405451530490
DJ-4006B40/3029551501615005451560490
DJ-500650/372900150163405451585522
DJ-5006B50/3729601501615005451610522
DJ-600660/452900150163405451665565
DJ-6006B60/4529601501615005451695565
DJ-750675/552965150163505451750650
DJ-10006100/752965150163505451790730
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. SealSic v/s Sic, Tc v/s Tc
TH Series Pumps
Pump ModelHP/KWRPMOUTLET / DN SIZESOLID PASSAGEMINIMUM SUBMERGENCE (Approx.)WIDTH / OUTER DIA (Approx.)HEIGHT (Approx.)Net Weight (In Kg) (Approx.)
TH-1503+15/112920808140485990248
TH-2003+20/1529308081404851030260
TH-4004+40/30295510083405451520490
TH-5004+50/37296010083405451570522
TH-6004+60/45296010083405451625565
TH-7504+75/55296510083405451740650
TH-10004+100/75294010083405501775730
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. SealSic v/s Sic, Tc v/s Tc
TL & JL Series Pumps
Pump ModelHP/KWRPMOUTLET / DN SIZESOLID PASSAGEMINIMUM SUBMERGENCE (Approx.)WIDTH / OUTER DIA (Approx.)HEIGHT (Approx.)Net Weight (In Kg) (Approx.)
TL-343.0/2.214501001615039669565
TL-545.0/3.714501001615039669570
TL-767.5/5.5146015020200445760100
TL-10610/7.5146015025200445760105
JL-150815/111450200162505201230280
JL-200820/151460200162505201230290
JL-250825/18.51460200162505201245310
JL-300830/221460200163806051425350
JL-350635/26.11460150163356601245400
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

Hot Water Pumps

Slurry Pumps

Nonclog & Waste Water Pumps

Dewatering Pumps

Clear & Raw Water Pumps

Stainless Steel 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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