Bottom Intake Submersible Pump

For more than 5 decades, EMU has developed and manufactured submersible motor pumps for water supply, control of water supply and booster plants.

To this end, S & N Pump and Rewind Ltd are delighted to offer the EMU Bottom Intake Submersible Pump which has the technical advantages of a submersible motor pump combined with the application possibilities of a shaft pump.

The pump is especially designed for the application in water treatment and irrigation plants, in mining and civil engineering, with offshore plants, for pumping low water levels and as a replacement for old, ineffective shaft pumping stations.

The special features of this pump are the high efficiency, reliability, long service life and no maintenance.

SEAWATER PUMP SPECIFICATION

AGGRESSIVE WATER DESIGN (special seawater design)

Pump and motor shall be manufactured by the same manufacturer according to EN and DIN standards.

Submersible Bottom Suction Pump in heavy seawater design

Pump type:
Motor type:
for pumping clean, cold seawater
for vertical installation
for 3-phase/480 V/60 Hz
star-delta starting
Capacity, US GPM
Total head, ft
Rated motor power, HP
Service Factor
Speed, rpm
max. water temperature, °C
Discharge connection, DN, PN

Each pump shall be tested according to ISO 2548/C or ISO 3555/B and test certificate shall be submitted after the test for approval.

PUMP MATERIAL

All pump casing parts shall be of zinc-free bronze class G-CuSn 10. The impeller shall be of heavy wear resistant Ni-Alu bronze class G-Cu Al 10 Ni, hydraulically and dynamically balanced and protected against wear by replaceable neck rings of non-corroding, high-grade stainless steel material. Additionally the pump casings shall be also protected by replaceable neck rings of high-grade stainless steel material.

The pump end bearing in the discharge piece shall be of heavy wear resistant bronze with a running surface out of rubber. The pump bearing shall not be directly exposed to the flow or backflow of the pump.

The suction zone shall be at the bottom end of the pumpset, the motor shall be located above the pump end, so that a deep lowering of the water level is possible.

The suction strainer shall be out of high-grade stainless steel. A suction cover of zinc-free bronze above the suction strainer shall avoid turbulences. The pump shaft shall be out of non-corroding high-grade stainless steel and protected by same grade stainless steel shaft sleeves in each stage of the pump.

All screwed connections of the pump shall be made ouf of non-corroding high-grade stainless steel.

MOTOR CONSTRUCTION

The motor shall be a three phase wet stator type PVC insulated motor directly coupled to the pump end. The motor casing shall be made out of a zinc-free bronze G-Cu Sn 10 resistant against corrosion. The external guide casing shall be of high grade 316 stainless steel.

The upper and lower bearing casting shall be made of zinc-free bronze with carbon bushes, with spiral lubricating and cooling grooves. It shall be sealed by a double heavy duty mechanical wear and corrosion resistant
shaft seal arrangement out of silicon carbide in tandem design.

The motor shall be equipped with a heavy duty thrust bearing (Mitchell type) consisting out of lapped stainlesss steel tumbling segments and a heavy, single piece stainless steel running plate with a polished carbon surface. The motor shall be equipped with a big expansion room at the top and an extra water extension chamber at an accessible place.

The shaft pivots shall be out of stainless steel protected by special shaft bushes. The cable connection shall be made absolutely water tight by 7 layers of high quality selfvulcanizing and insulating tape. The cable shall be a heavy duty NSSHoeu cable by Siemens and shall neither alter
nor contain any heavy metal ingredient.

The cable shall be suitable for a maximum water temperature of 60°Celsius.
The motor shall be filled with a water-glycol mixture.
The motor shall be preserved for storage up to five years after shipment.
The motor shall be capable to perform a maximum of 10 starts per hour.
The motor shall have a service factor of SF .........
The motor shall be suitable for a maximum temperature of ............ °C / ............. F of the pumped liquid.

Optional

The motor windings shall be equipped with cold type thermistors or PT 100 sensors in the windings which will shut off the motor in case of overheating.

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Factory Pump Testing

Each pump and motor shall be tested at the factory prior to shipment. The tests shall consist of the following:
1. The mechanical and electrical integrity of the pump shall be established by the use of physical inspection and the use of a megger for verification of the stator resistance to short circuit.
2. The motor power leads shall be connected in accordance with the contracted voltage requirements and the pump started to verify rotation and no load amp readings. Any undue noise or vibration shall be investigated after discontinuing the test and further tests shall be carried out after the fault is rectified.
3. If requested, the pump shall be installed in the test tank on a wet pit discharge elbow and complete hydraulic tests conducted. The KW input, power factor, flowrate and head shall be measured and recorded. The pump shall be operated at the duty point for the project and checked for compliance against respective ISO/DIN-Standards prior to being certified. The pump shall then be removed and given a physical inspection and additional megger insulation test to re-establish the mechanical and electrical integrity. Copies of hydraulic test results are maintained at the factory and supplied when requested.

Compatibility of Equipment

In order to insure proper performance and compatibility of interacting components within these specifications; all pumps, access frames, guide rails, and lifting systems, shall be the product of one manufacturer or furnished by the pump manufacturer for sole source responsibility.

The structure is equivalent to an inverted submersible motor pump with pump component and intake strainer in the lower section and submersible motor above the pump component.

The intake is effected over a suction strainer and an integrated intake funnel with antivortex plate. As a result, a very low water level can be achieved. The one-stage or multi-stage pump component is sealed by a double mechanical shaft seal from the submersible motor.

In the outer shroud, the pumped liquid circulates around the complete motor. The discharge piece is located at the upper end.

A differential tank for the motor filling can be provided.

Advantages

• Low water level through bottom intake
• Very good motor cooling by submerged motor shroud
• High safety by double Mechanical Shaft seal
• Perfect lubrication of thrust bearings by high water cover in the motor
• Motor filling of clear drinking water or EMU-filling possible
• Motor filling can be checked can be checked via filling level vessel

Advantages over Shaft Pumps

• Insensitive to moisture and flood, no building construction
• No shafts, therefore low wear and no maintenance
• Robust and compact design
• Simple pipeline installation
• Good efficiencies, modern technique through reliable EMU quality