General
Magnetic Coupled Process Pumps of the series are Heavy Duty Sealless Pumps. The containment shell forms a closed system to separate the pumped liquid from the atmosphere by confined gaskets. The process pump equipment (including auxiliaries) is designed and constructed for a minimum service life of 20 years (excluding normal wear parts) and an uninterrupted operation of at least 3 years.
Construction
The Heavy Duty Sealless Pumps are end suction, top discharge, single stage, radial split volute casing pumps of back-pull-out design with closed impellers. The mechanical design meets the API 685 requirements.
The bearing bracket design allows the removal of the complete unit including outer magnets and ball bearings without depressuring the pump or exposing the pumpage to the atmosphere.
Volute casing of the Heavy Duty Sealless Pump
The volute casing of standard design is cast en bloc and centerline supported.
The casing forms - together with the containment shell - the pressure retaining pump unit. Maximum allowable pressure at PT is determined by the shell design and the material. The pump casing has metal-to-metal fits with confined compression controlled gaskets.
Pump flanges are full or spot faced on the back and designed for through-bolting.
Magnetic coupling
The single elements of the multipolar magnetic coupling are permanent-magnets made of "Cobalt Samarium - Rare Earth". Power is transmitted by a magnetic field, built up by the outer and inner magnets, through the containment shell. This kind of magnetic coupling works synchronously without slip and transmits the required torque to the impeller.
The magnetic couplings are designed to transmit rated motor power up to 160 kW (217 HP) at 2900 rpm, respectively 195 kW (265 HP) at 3500 rpm. The couplings are sized to fit the maximum power consumption of the rated impeller and allow also at least 5% increase of the installed impeller diameter. If nothing else is foreseen, the transmissible coupling power, the rated motor power and the available moments of inertia are sized for direct-on-line starting of the electric motor.
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