Iwaki MP Series Metallic Magnetic Drive Process Pumps

Iwaki MP is a family of compact, metallic centrifugal magnet drive pumps for small and medium-sized process lines. The seal-less design has no shaft seal, the wet end is made of 316 stainless steel, and the series covers motor outputs from 0.75 kW up to 15 kW. Mikron Proses (Üsküdar, Istanbul) provides selection, quotation and application consulting for Iwaki pumps, including the MP series.

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For the other Iwaki magnetic-drive process pump series, see Iwaki magnetic-drive process pumps. A larger metallic option is the Iwaki MTFO series.

PB assembly and model range

The distinguishing feature of the series is the PB assembly: a completely assembled wet-end rotating element that includes the impeller, casing cover, bearings, inner magnet coupling, shaft and rear casing. After an unexpected failure the pump can be put back into service just by exchanging the rotating PB assembly, which shortens downtime. The magnet drive is supported by the SiC-D bearing; according to the manufacturer its specially treated surface has a coefficient of friction one quarter that of standard SiC, so much less heat is generated during upset or dry-running conditions and accidental dry running can be tolerated for certain periods.

The catalog lists 15 models from MP210 to MP8515. The K-type magnet coupling is used on MP210, 220, 221, 222, 420, 421, 541 and 542; the V-type is used on MP4220LF, 4220, 5225LF, 8415, 8420, 8515 and 5430.

Special variants and options

The MH variant covers room temperature up to +280 °C: a finned frame adapter dissipates heat away from the pump, and rare earth SmCo magnets and a high-temperature gasket material are used. The ML variant covers -80 to +150 °C: a nitrogen purge port prevents moisture from freezing in the frame adapter, and rare earth Nd magnets and a low-temperature gasket material are used. The catalog is produced for Iwaki by Sanwa Hydrotech Corp. (Osaka, Japan).

The optional Iwaki DRN pump protector is an electric current sensing device that stops the pump when it runs dry or draws in air, and it also detects overload. The instruction manual states that the pump must not be used in a potentially explosive atmosphere unless it is equipped with an explosion-proof motor.