Iwaki MXM Series Heavy-Duty Magnetic Drive Chemical Process Pumps

Iwaki MXM is a magnetic drive process pump for heavy-duty chemical applications, with CFRETFE wetted parts inside an external armour of ductile cast iron. The manufacturer positions the MXM series for corrosion resistance, durability and safety together. The wetted parts use carbon fiber reinforced ETFE (CFRETFE), high-purity alumina ceramic and carbon. Mikron Proses provides selection, quotation and application consulting for Iwaki pumps, including the MXM series.

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Other Iwaki magnetic-drive pumps with fluoroplastic wetted parts are the Iwaki MX-F series and the Iwaki SMX-F series; see also Iwaki magnetic-drive process pumps.

The non-contact system prevents contact between the bearing and the rear thrust faces even during dry running, and the self-radiating bearing structure circulates liquid around the spindle and bearing through heat-dispersion holes. This minimises heat generation, so that plastic parts do not melt. In the high-temperature version an FRP rear casing cover is added to the rear casing; this dual structure provides dual containment against liquid leakage in the event of unexpected damage to the rear casing.

Models and material options

The MXM is made in three casing sizes: MXM22 (25 x 25 mm), MXM44 (40 x 40 mm) and MXM54 (50 x 40 mm). The bearing and spindle material code has three options: CF (high-density carbon bearing with a high-purity alumina ceramic spindle; tolerant of dry running and entrained air to a degree), FF (alumina ceramic bearing and spindle; the liquid should have a viscosity of 1 mPa·s or more; not allowed to run dry) and KK (SiC bearing and spindle; the same tolerance as CF for entrained air, but not allowed to run dry). The O-ring is FKM, EPDM, AFLAS® or DAI-EL PERFLUORO®.

Casing	Connection	Motor output	Capacity at the listed duty points	Head at the listed duty points
MXM22	25 x 25 mm	0.37-0.75 kW	150 L/min	2.5-8 m
MXM44	40 x 40 mm	0.75-1.5 kW	200 L/min	5-12 m
MXM54	50 x 40 mm	1.5-4.0 kW	200-400 L/min	9.5-25 m

Note: values are the duty points in the Iwaki catalog (50 Hz, clear water at 20 °C), which depend on the impeller size.

No magnetic drive pump supports continuous closed running, so a minimum flow must be kept: 10 L/min for MXM22 and MXM44; 20 L/min for MXM54 impeller ranges 1 to 3 and 50 L/min for impeller range 4. Choose the pump for the liquid gravity: shaft power (Sp) x liquid gravity x 1.1 must stay below the motor output. The internal pressure of the pump must not exceed the maximum operating pressure listed above. Optional Iwaki DRN current-sensing protectors detect dry running and overload.