Iwaki MTFO Series Magnetic Drive Process Pumps

What is the Iwaki MTFO?

Iwaki MTFO is a stainless steel, ISO 2858 compatible, seal-less centrifugal process pump with a magnet drive. Torque is transmitted by magnets, so there is no shaft seal between the motor and the impeller. Its main uses are:

• seal-less transfer of corrosive process liquids,
• temperature duties between -80 and +280 °C, with special magnet and gasket options,
• lines in ISO 2858 compatible plants where back pullout maintenance is needed,
• special applications with solids up to 30%, subject to factory approval,
• potentially explosive atmospheres under the ATEX Directive 94/4/EC.

The MTFO is a close-coupled pump with an open impeller and is available with 4-pole and 2-pole motors up to 22 kW. Mikron Proses provides selection, quotation and application consulting for Iwaki pumps. When you share the liquid, temperature, flow and head, a suitable model can be selected together. For plastic and fluoropolymer magnetic-drive alternatives, see Iwaki magnetic-drive process pumps; for a smaller metallic option, see the Iwaki MP series.

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Datasheet summary

The Iwaki datasheet and the catalog give the following limits. See the document list at the bottom of the page for the full PDFs.

Parameter	50 Hz	60 Hz
Maximum capacity	1600 L/min (96 m³/h)	1200 L/min (72 m³/h)
Maximum head	80 m	85 m
Rotation speed	1500 / 3000 rpm	1800 / 3600 rpm

Common values: operating temperature -80 to +280 °C, design pressure 1.6 MPaG, maximum specific gravity 2, maximum viscosity 300 mPa·s, flange standard ASME / DIN / JIS, open impeller, motor 2.2-22 kW, suction x discharge bore 40 x 25 to 100 x 80 mm. The model code (example: MTFO 40 x 25 - 160 W) shows the suction bore, the discharge bore and the nominal impeller diameter (160, 200 or 250 mm). The maximum flow and head values in the table may belong to different models, so the duty point is verified against the model curve.

Construction and materials

According to the catalog parts list, the casing, casing cover, rear casing, impeller and impeller nut are 316 stainless steel; the bushing, sleeve and thrust ring are SiC; the O-ring and gasket are PTFE. The standard pump material is SCS14 (SUS316), with SCS13 (SUS304), ALLOY20 and Hastelloy-C equivalent as options. The bearing is SiC, with SiC-D optional, and the magnet is a rare earth type (Nd / SmCo). Running dry or against a closed discharge can heat the bearings and the magnet capsule, so the manufacturer’s instruction manual asks users to avoid these operating conditions; the optional Iwaki DRN current-sensing protector helps monitor dry running and overload.

Manufacturer and document sources

The catalog is produced for Iwaki by Sanwa Hydrotech Corp. (Osaka, Japan). The values on this page come from the Iwaki Europe datasheet, the Sanwa MTFO catalog and the MTFO instruction manual, which are linked as PDFs at the bottom of the page. The catalog asks users to contact the supplier below -20 °C or above 120 °C. The manual lists three liquid temperature types: the standard model (-30 to +150 °C, Nd magnets), the MTFO-L low-temperature model (-80 °C to room temperature, Nd magnets, nitrogen purge port) and the MTFO-H high-temperature model (room temperature to +280 °C, SmCo magnets, finned frame adapter).