Mody Pumps G 556 T - Manual (Page 6)

TECHNICAL DESCRIPTION:
THE MODY SUBMERSIBLE PUMP IS IN ITSELF A COMPLETE PUMPING STATION. BESIDES A
POWER SUPPLY AND A DISCHARGE HOSE NO EXTRA EQUIPMENT IS REQUIRED. THE COMPLETE
PUMPSET IS IN A MODULAR CONSTRUCTION ENSURING GOOD AND SIMPLE SERVICEABILITY.
THE MAJOR DESIGN FEATURES ARE AS UNDER:
THE MOTOR
A RUGGED ALUMINUM DIE CAST/COPPER 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. DUAL 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:
SINGLE ROW DEEP GROOVE BALL BEARINGS SEALED FOR LIFE WITH SPECIAL HIGH
TEMPERATURE BEARING GREASE REQUIRING NO PERIODIC MAINTENANCE WHATSOEVER.
THE HYDRAULIC ELEMENTS :
TWO STAINLESS STEEL IMPELLERS IN TANDEM RUNNING AGAINST A RUBBER LINED
DIFFUSERS AND A GUIDE PLATE, CONSTITUTE THE HYDRAULIC ELEMENTS OF THE PUMP. THE
IMPELLERS/DIFFUSERS 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 EPR
SHEATHED AND INSULATED CABLE CONFORMING TO INTERNATIONAL STANDARDS. 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 CONTACTOR 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.