Polder Pumpset

Applications :

Irrigation and Dewatering
Cooling – Water Supply
Storm Water Pumping Station
Retention Reservoirs
Flood Prevention Pumping Station
Dewatering from Canal and River Bed

Design / Construction :

MBH Polder pump sets are portable pumping units, featuring a pump-below and motor-above configuration with a single/two-stage mixed flow impeller design. Powered by a squirrel cage induction motor, they are suitable for 400/440 volts, three-phase, 50 Hz A.C. supply. The motor windings are wet type, totally enclosed, water-filled, water and oil resistant, robust in design, and lightweight. The close-coupled and jacketed construction of the pump motor unit allows effective water cooling by the pumped liquid flowing around the motor casing into the discharge main. A special mechanical seal prevents water from entering the motor chamber. Axial thrust is controlled by thrust bearings. All parts are made from specially processed materials to ensure long life under tough operating conditions.

Advantages :

Robust construction; suitable for flooded or partially submerged conditions.
Water-filled and water-lubricated pump motors.
Continuous cooling of the motor by the pumped liquid prevents overheating.
Can pump out liquid from the lowest levels.
Submersible installation eliminates the need for foundation or pump house.
Cuts civil cost by nearly 50%.
Can be installed in a collection well.
Portable – easily shifted and handled.
Silent operation.

Material Specification :

Volute Casing / Suction Housing: Cast Iron IS 210 FG200
Impeller: Stainless Steel / Bronze / Cast Iron
Shaft: Stainless Steel 410
Motor Body: Mild Steel Fabricated
Bush Bearing: Bronze – LTB 4

Note: Different materials can be offered according to the application.

Technical Specification :

Head: up to 120 meters
Capacity: up to 1500 cu.mtr./hr.
Stage: One / Two
Lubrication: Water
HP: 10 to 350
RPM: 2900 / 1450

CROSS SECTION:

Highlight of Submersible Polder in comparison with centrifugal / Vertical Turbine pumps

Submersible Polder Pumps	Centrifugal Pumps	Vertical Turbine Pumps
Could Completely/Partially be submerged in water.	Not possible, since motor not sealed and is wound with enameled winding wire.	Pumps is of course submerged, but needs pump house, in well, jack-well etc.
Since very much portable, no permanent structure is needed. A simple pit/tank filled with water is quite sufficient and could be discharged with flexible rubber/PVC pipe/MS. pipe.	The nature of pump needs permanent structure, Suction pipe, foot value etc. making it cumbersome.	Pumps needs permanent structure like pump house, pump foundation etc. and installation is quite cumbersome.
An absolutely trouble free Compact design pump.	a) Gland leakage b) Air locking c) Foot value chocking (clogging) are regular and need constant attention.	a) Needs column pipe assembly, shaft assembly and bowl assembly and because of lengthy column shaft assembly continues vibration occurs resulting in more wear and tear. As a result of this, there would be constant gland leakage from the shaft sleeve. b) Proper alignment is must.
Self priming (Submerged).	Priming is necessary.	Self-Priming (submerged) Constant attention is a must.
Needs no extra.	Constant attention is a must.	Needs regular replacement of parts and repairing costs are quite exorbitant.
Quite a longer life.	Needs regular replacement of parts. Particularly, horizontal pumps need proper alignment and periodical check-up is must.	Bowl bearing bushes are regularly getting worn out as they are directly coming in to contact with water duly mixed with sit/mud/sludge.