Mody Pumps MS 252 - Manual (Page 3)

GENERAL INFORMATION.
THE
“MS” SERIES OF MODY'S SUBMERSIBLE SEWAGE PUMPS ARE PRIMARILY DESIGNED FOR
HANDLING SEWAGE, SLUDGE, SLURRIES, WASTEWATER AND LIQUID MANURE. THEY CAN ALSO
BE USED FOR HANDLING STORMWATER DRAINAGE WITH HIGH SOLIDS CONTENT.
THE SERVICE LIFE OF A SUBMERSIBLE PUMP PRIMARILY HINGES ON TWO ASPECTS: THE
DEPENDABILITY OF THE SEALING SYSTEM AND THE WEAR RESISTANCE OF THE PUMP ITSELF.
THE
“MS” SERIES OF PUMPS ARE AVAILABLE WITH A WIDE RANGE OF IMPELLERS TO SUIT
PRACTICALLY EVERY PUMPING DUTY WITH HIGH EFFICIENCES.
THE MS 252 HAS A SINGLE CHANNEL IMPELLER WITH 75MM/3” SOLIDS HANDLING
CAPABILITY.
THE SINGLE CHANNEL IMPELLERS ARE IN CAST IRON CONSTRUCTION. THE PUMP VOLUTES
ARE ALSO IN CAST IRON WITH SMOOTH PROFILED GEOMETRY FOR CLOG FREE OPERATION AND
HIGH EFFICIENCES. ALL VOLUTES ARE FITTED WITH REPLACEABLE WEAR RINGS.
IT IS IN THE INTEREST OF THE USER THAT HE/SHE GO THROUGH THIS MANUAL IN DETAIL
PRIOR TO USING THE PUMP.
TECHNICAL DESCRIPTION
.
THE PUMPSET IS IN A MODULAR CONSTRUCTION ENSURING EASY AND SIMPLE
SERVICEABILITY. THE MAJOR DESIGN FEATURES ARE AS UNDER:
A] THERMAL PROTECTION : SEE UNDER "MOTOR PROTECTION" .
B] 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 DEEP GROOVE
BALL BEARINGS. INSULATION CLASS "F" (155 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.
C] THE SEAL CHAMBER: THE HEART OF THE "MODY" PUMP. DUAL MECHANICAL SEALS,
TUNGSTEN CARBIDE V/S TUNGSTEN CARBIDE SEAL FACES. SECONDARY SEALS OF NITRILE
RUBBER AND METAL PARTS IN STAINLESS STEEL, RUNNING IN AN OIL BATH. THE SEALS
HAVE BEEN SPECIFICALLY DESIGNED WITH EXTREMELY SHORT WORKING LENGTHS KEEPING
IMPELLER OVERHANG TO THE MINIMUM. THIS ENSURES EXTENDED SEAL AND BEARING LIFE.
D] BEARINGS: DOUBLE ROW ANGULAR CONTACT LOWER BEARING, WITH SINGLE ROW DEEP
GROOVE UPPER BALL BEARING GREASED FOR LIFE WITH A SPECIAL HIGH TEMPERATURE
BEARING GREASE REQUIRING NO PERIODIC MAINTENANCE WHATSOEVER.
E] THE HYDRAULIC ELEMENTS: SINGLE CHANNEL IMPELLERS WITH LARGE SOLID HANDLING
CAPACITY. SMOOTH PROFILED VOLUTES FOR HIGH EFFICIENCES.
F] CABLE GLAND ASSEMBLY: THE PUMP IS SUPPLIED WITH 50’ CABLE AS STANDARD. THE
CABLE IS AWG #12 SOOW 4 CORE WITH AN OPTION AVAILABLE FOR 6 CORE WHEN THERMAL
OVERLOADS ARE REQUIRED AND SEVEN CORES WITH A SEAL PROBE SENSOR CONNECTED TO AN
ABB MONITOR IN PUMP CONTROL PANEL. (SCHEMATIC ATTACHED). THE CABLE IS
TERMINATED IN THE PUMP AT THE CABLE GLAND. THE GLAND ASSEMBLY SEALS THE CABLE
ON THE OUTSIDE SHEATH. A WATER DAM ARRANGEMENT IS ALSO 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 TERMINAL CHAMBER
IN THE EVENT OF A CUT CABLE. THE CABLE IS ALSO SHEATHED FOR THE 1ST ONE METRE
LENGTH 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