Iwaki MX-F Series Magnetic Drive Chemical Process Pumps

Iwaki MX-F is a magnetic drive chemical process pump with CFRETFE wetted parts; the magnet drive removes the need for a shaft seal. The casing, impeller and magnet capsule are made of CFRETFE (carbon fiber reinforced ETFE), a fluororesin with resistance to chemicals; the instruction manual states that the pump can handle strong acids and alkalis. Mikron Proses provides selection, quotation and application consulting for Iwaki pumps, including the MX-F series.

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The MX-F is designed on the same concept as the GFRPP Iwaki MX series. For other Iwaki magnetic-drive pumps, see Iwaki magnetic-drive process pumps.

The datasheet describes a self-radiating structure and a non-contact structure (both except MX-F100). Heat-dispersion holes in the fixed portions of the impeller and the magnet capsule force the liquid around the spindle and bearing to circulate, which reduces heat from sliding; the non-contact structure keeps the rear thrust face and the rear part of the bearing from touching continuously, even during dry running. Together they let the pump retain durability under abnormal operation such as dry running, cavitation and closed-discharge operation. The volute casing is divided into two sections (except MX-F400) to keep internal leakage to a minimum, and the front and rear casings are reinforced with ribs.

Models and material options

The series has seven models in three casing sizes: MX-F100, MX-F250, MX-F251, MX-F400, MX-F401, MX-F402 and MX-F403. For MX-F250 to MX-F403 the bearing, spindle and O-ring combination is selected with one of three codes: CFV (high density carbon bearing with a high purity alumina ceramic spindle), RFV (PTFE bearing with a high purity alumina ceramic spindle) and KKV (SiC bearing with a SiC spindle). MX-F100 is offered as RV (PTFE) or KV (SiC). The standard O-ring is FKM; AFLAS® and EPDM O-rings are also available. MX-F402 and MX-F403 have an unplugging-preventive lock pin.

Model	Connection	Motor	Max. capacity	Standard duty point (T impeller)
MX-F100	G1 x G1	0.26 kW	110 L/min	70 L/min at 5.8 m
MX-F250	G1 x G1	0.37 kW	150 L/min	50 L/min at 11.7 m
MX-F251	G1 x G1	0.75 kW	150 L/min	80 L/min at 15.7 m
MX-F400	G1½ x G1½	0.37 kW	250 L/min	100 L/min at 10.1 m
MX-F401	G1½ x G1½	0.75 kW	270 L/min	150 L/min at 12.8 m
MX-F402	G2 x G1½	1.5 kW	440 L/min	200 L/min at 18.3 m
MX-F403	G2 x G1½	2.2 kW	510 L/min	250 L/min at 22.8 m

Note: the MX-F100 standard duty point is for impeller Y; the other models are shown for impeller T (impellers V and W are listed for liquids of higher specific gravity). Values are for 50 Hz and clear water at 20 °C.

The magnetic drive pump is not durable in long closed-discharge operation, so a minimum flow must always be kept: 10 L/min for MX-F100, 250, 251, 400 and 401, and 20 L/min for MX-F402 and MX-F403. For MX-F250 and larger models, the motor output should keep a 10% allowance over the shaft power multiplied by the specific gravity.

Optional dry-running protection

An Iwaki DR-20 current-sensing dry-running protector can be added (380-440 V three-phase, 0.75-15 kW motor range). It detects a decreased load current and stops the pump on dry running, air suction, operation with the suction side closed or overload.