Finish Thompson MSKC Series Multi-Stage Sealless Magnetic Drive Centrifugal Pumps
Overview
The Finish Thompson MSKC Series is a line of multi-stage sealless magnetic drive centrifugal pumps designed for applications requiring higher discharge pressures at relatively low flow rates. Utilizing a two-stage hydraulic design, the series provides increased head generation while maintaining the leak-free operation associated with magnetic drive pump technology. The MSKC Series is commonly applied in chemical processing, recirculation, filtration, spraying, and transfer systems where elevated pressure requirements exceed the practical range of a comparable single-stage pump.
The pumps are available in polypropylene or PVDF construction and are designed to accept standard NEMA or IEC motors. By combining a compact footprint with multi-stage hydraulics, the MSKC Series provides broad performance flexibility without requiring the large impeller diameters typically associated with higher-head centrifugal pump applications.
Design and Construction
MSKC Series pumps utilize a sealless magnetic drive configuration that eliminates mechanical seals and the associated maintenance and leakage concerns found in conventional centrifugal pumps. Torque is transmitted through a magnetic coupling to a unique interconnecting drive shaft that transfers power between hydraulic stages, allowing the pump to generate higher pressures while maintaining complete fluid containment.
The hydraulic assembly incorporates two impeller stages, individual thrust-bearing support at each stage, and a ceramic shaft system designed to provide stable operation and long service life in corrosive chemical service. Independent thrust-bearing arrangements help manage hydraulic loads throughout the pump while supporting reliable operation across the performance range.
Non-metallic wetted components are available in either polypropylene or PVDF for compatibility with a wide range of aggressive process chemicals. The compact construction allows the pump to deliver higher heads while maintaining a relatively small installation footprint compared to alternative high-pressure centrifugal pump configurations.
Hydraulics and Performance
The defining characteristic of the MSKC Series is its multi-stage hydraulic design. By utilizing two impellers operating in series, the pump develops significantly higher discharge heads than a comparable single-stage magnetic drive pump while maintaining moderate flow rates and efficient power utilization.
Multiple impeller diameter combinations are available, allowing performance to be tailored to specific system requirements. The wide hydraulic envelope enables users to match flow and pressure requirements without changing pump platforms, providing flexibility for process systems with varying operating conditions.
The series is particularly well suited for applications where higher pressure is required for circulation, filtration, transfer, or spray duties. Typical services include systems with extended piping runs, filtration equipment, process recirculation loops, and applications where pressure requirements exceed the capabilities of standard single-stage centrifugal designs.
Materials
MSKC Series pumps are available with wetted components manufactured from glass-filled polypropylene or PVDF. These materials provide chemical resistance for a broad range of acids, caustics, plating solutions, treatment chemicals, and other corrosive process fluids.
Internal wear and bearing components incorporate engineered materials selected for chemical compatibility and durability in demanding service. Ceramic shaft elements, PTFE thrust components, and available carbon, PTFE, or ceramic bushing materials are used throughout the pump assembly to support reliable operation in aggressive chemical environments.
Elastomer options include both FKM and EPDM, allowing the pump to be configured for compatibility with specific process fluids and operating conditions.
Multi-Stage Design Features
The MSKC Series is specifically engineered for applications requiring high head at relatively low flow rates. Its two-stage configuration allows pressure generation to be distributed across multiple impellers, reducing the need for oversized single-stage hydraulics while maintaining a compact overall package.
A distinctive interconnecting drive shaft transmits torque from the magnetic coupling to the first-stage impeller and through the second-stage hydraulic assembly. Combined with independent thrust-bearing support at each stage, this arrangement is designed to provide smooth power transfer and controlled hydraulic loading throughout the pump.
This multi-stage approach makes the MSKC Series particularly suitable for applications where pressure requirements vary and impeller combinations can be selected to optimize system performance.
Maintenance Features
The sealless magnetic drive design eliminates routine mechanical seal replacement and removes a common source of maintenance in corrosive chemical pumping systems. With no dynamic shaft seal exposed to the pumped liquid, the pump provides containment without seal adjustment or seal support systems.
The modular wet-end construction allows access to hydraulic components for inspection and service when required. Standard motor configurations simplify motor replacement and support interchangeability across installations. The pump's non-metallic construction also eliminates concerns associated with corrosion of metallic wetted components in aggressive chemical service.
Applications
The MSKC Series is used in industrial processes requiring higher-pressure chemical handling and recirculation. Typical applications include chemical processing systems, bulk chemical transfer, spray systems, plating recirculation and filtration equipment, printed circuit board etching and rinse operations, wet scrubbers, and water or wastewater treatment processes.
The pumps are also applied in laboratory, pharmaceutical, and photo-processing systems where corrosive liquids must be handled safely while maintaining elevated discharge pressures. Typical pumped fluids include acids, caustics, plating solutions, treatment chemicals, scrubber liquids, and other corrosive process fluids compatible with polypropylene or PVDF construction.
