Iwaki MDM NP Series Long Coupling Magnetic Drive Pumps

The Iwaki MDM NP is a long coupling magnetic drive process pump with fluororesin (PFA) wetted parts. It belongs to the MDM family and uses the non-contact system that improves its resistance against abnormal running conditions. Piping connections comply with ISO standards (ISO 2858 / DIN EN22858) on a common base. Mikron Proses (Üsküdar, Istanbul) supplies Iwaki MDM NP pumps in Turkey and provides application consulting on pump size and material selection.

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Performance and sizes

The long coupling catalogue lists four pump sizes for 50 Hz operation with 2-pole and 4-pole motors. Capacity is for clear water.

Model	Suction × discharge	Capacity, 2-pole (L/min)	Motor output, 2-pole
MDM50-32-160	50 × 32 mm	208	4.0, 5.5 or 7.5 kW
MDM50-32-200	50 × 32 mm	208	5.5, 7.5, 11 or 15 kW
MDM65-40-160	65 × 40 mm	417	4.0, 5.5 or 7.5 kW
MDM80-50-160	80 × 50 mm	833	5.5, 7.5, 11 or 15 kW

With 2-pole motors, the maximum head in the table is 70.0 m (MDM50-32-200 with the 225 mm impeller). With 4-pole motors the same sizes deliver 200 to 500 L/min at lower head, and the motor range is 1.5 to 5.5 kW. The allowable maximum pressure is 1.6 MPa and the liquid temperature range is -20 to 150 °C.

Non-contact system and ISO long coupling design

The rare earth magnets prevent the magnet capsule from coming into contact with the thrust ring of the rear casing, which prevents the fluororesin parts from melting through heat generation. A rear ring and a rear thrust are built in as a precaution against abnormal running such as cavitation or air entering the pump. The rear casing cover is made of fibre reinforced plastic; the catalogue states that it eliminates the eddy current loss of the rotating magnetic field and that no spark would be generated if it touched the drive magnet unit. The pump uses a back pullout system, so internal inspection and part replacement are possible without removing the piping, and the design includes measures to prevent liquid from leaking when the foot support (bracket) is pulled back.

Materials

The front casing is a one-piece ductile cast iron moulding with an integrally moulded natural PFA lining. The impeller and magnet capsule are PFA, the bearing and spindle are SiC, and the gasket is PTFE. According to the catalogue, natural PFA generates fewer contaminants and suits the transfer of high-purity chemicals. Applications cover chemical process duties from acid to alkali and high-purity chemicals for the semiconductor industry. Chemical compatibility depends on the liquid, concentration and temperature, so please check your duty with us before ordering.

For the standard-coupling version of the same family, see the Iwaki MDM series. For the other Iwaki process pump series, see the Iwaki magnetic-drive process pumps page.