Mody Pumps G 706 TM - Manual (Page 6)

TECHNICAL DESCRIPTION.
THE MODY SUBMERSIBLE PUMP IS IN ITSELF A COMPLETE PUMPING STATION. BESIDES A
POWER SUPPLY, CONTROL BOX AND A DISCHARGE HOSE NO EXTRA EQUIPMENT IS REQUIRED.
THE COMPLETE PUMPSET IS IN A MODULAR CONSTRUCTION ENSURING GOOD AND SIMPLE
SERVICEABILITY. MAJOR DESIGN FEATURES ARE AS UNDER:
THE MOTOR
A RUGGED ALUMINUM DIE CAST ROTOR DYNAMICALLY BALANCED TO GRADE 2.5 ACCURACY OF
ISO 942. A STAINLESS STEEL SHAFT RUNNING IN TWO BALL BEARINGS. INSULATION CLASS
"H" (180 DEGREES CELSIUS). END WINDINGS DULY EPOXY COATED TO PREVENT
DETERIORATION OF INSULATION EVEN IN EXTREMELY HUMID CONDITIONS. WINDING WIRE IS
DUAL COATED SUITABLE FOR "H" CLASS INSULATION.
THE SEAL CHAMBER
THE HEART OF THE MODY PUMP. TANDEM MECHANICAL, TUNGSTEN CARBIDE V/S TUNGSTEN
CARBIDE SEAL FACES (LOWER SEAL) AND TUNGSTEN CARBIDE V/S TUNGSTEN CARBIDE
(UPPER SEAL), SECONDARY SEALS OF HNBR RUBBER AND METAL PARTS IN STAINLESS
STEEL, RUNNING IN AN OIL BATH, ENCLOSED IN A PRESSURE COMPENSATING RUBBER OIL
BAG - CREATES THE ULTIMATE SEAL SOLUTION. THE DESIGN OPTIMIZES SEAL LIFE AND
ALLOWS FOR SIX MONTHLY (2500 HOURS) SERVICE INTERVALS.
BEARINGS.
TWO ANGULAR CONTACT BALL BEARINGS (IMPELLER SIDE), ARRANGED BACK TO BACK,
FILLED WITH A SPECIAL HIGH TEMPERATURE BEARING GREASE REQUIRING NO PERIODIC
MAINTENANCE WHATSOEVER. THE TOP BEARING IS A SINGLE ROW DEEP GROOVE BALL
BEARING, GREASE FILLED AND SEALED FOR LIFE.
THE HYDRAULIC ELEMENTS
.
THE HARDENED STAINLESS STEEL IMPELLER RUNNING AGAINST A RUBBER LINED DIFFUSER
AND WEAR PLATE, CONSTITUTE THE HYDRAULIC ELEMENTS OF THE PUMP. THE
IMPELLER/DIFFUSER CAN BE ADJUSTED TO MAINTAIN MAXIMUM OUTPUT AFTER USAGE
WITHOUT PARTS REPLACEMENT. IT IS IMPORTANT, HOWEVER, TO MAINTAIN CLEARANCES
BETWEEN THE WEAR PARTS.
CABLE GLAND ASSEMBLY. (REFER DRG.)
THE PUMP IS SUPPLIED WITH 50 FEET CABLE AS STANDARD. THE CABLE IS A 4 CORE or 6
CORE (TWO WIRES WILL BE THE OPTIONAL THERMALS) EPR SHEATHED AND INSULATED CABLE
CONFORMING TO INT’L STD. THE CABLE IS WATERPROOF AND CAN BE COMPLETELY
SUBMERGED IN WATER. THE CABLE IS TERMINATED IN THE PUMP AT THE CABLE GLAND. THE
GLAND ASSEMBLY SEALS THE CABLE ON THE OUTSIDE SHEATH AS WELL AS A WATER DAM
ARRANGEMENT IS PROVIDED WHICH SEALS THE INDIVIDUAL CORES OF THE CABLE. THIS
FEATURE IS UNIQUE AND IS ESSENTIAL TO PREVENT WATER SEEPING THROUGH THE CORES
OF THE CABLE INTO THE MOTOR CHAMBER IN THE EVENT OF A CUT CABLE. THE CABLE IS
ALSO SHEATHED FOR THE FIRST ONE METER BY MEANS OF A CABLE GRIP MADE OF
STAINLESS STEEL. THIS IS ESSENTIAL TO ENSURE THAT THERE IS NO UNDUE STRAIN ON
THE CABLE IF THE PUMP IS PULLED OR LOWERED INADVERTENTLY BY MEANS OF THE CABLE.
COMPLETE DETAILS OF THE CABLE GLAND ASSEMBLY ARE SHOWN IN THE DRAWING.