Iwaki SMX-F Series Self-Priming Magnetic Drive Chemical Pumps

Iwaki SMX-F is a horizontal self-priming magnetic drive pump made of fluororesin (CFRETFE), used to transfer chemicals where the suction line cannot be kept flooded. The seal-less design has no shaft seal, and the pump needs no external self-priming chamber or valve. Mikron Proses provides selection, quotation and application consulting for Iwaki pumps, including the SMX-F series.

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For a GFRPP version in the same capacity range, see the Iwaki SMX series. Other Iwaki magnetic-drive pumps are listed under Iwaki magnetic-drive process pumps.

The casings, impeller assembly and magnet capsule are made of CFRETFE, and the other wet-end parts use materials such as carbon and ceramic, so the pump can handle almost any chemical, including strong acids and alkalis. The patented self-radiation structure disperses bearing friction heat to protect the pump under abnormal operating conditions, and the non-contact structure prevents contact between the rear thrust face and the bearing, which eliminates heat buildup during dry running. The wet end can be removed from the motor as a complete assembly by removing the 4 mounting bolts on the motor bracket; a rear casing support makes maintenance and the draining of residual liquid easier.

Self-priming principle and models

When the pump is primed with liquid and started, it sucks gas and liquid into its inlet. The mixture is agitated by the impeller in the front casing and discharged to the rear case, where gas and liquid separate: gas is bled from the discharge port while some liquid is retained, and the liquid in the rear case is fed back to the front casing through a circulation hole. This repeats until the gas on the suction side is completely expelled, after which normal centrifugal pump operation resumes.

The SMX-F is made in three casing sizes: SMX-F22 (25 x 25 mm), SMX-F44 (40 x 40 mm) and SMX-F54 (50 x 40 mm). The bearing, spindle and liner ring material code has three options: CF (high density carbon bearing, high purity alumina ceramic spindle), RF (PTFE bearing with filler, high purity alumina ceramic spindle) and KK (SiC bearing, SiC spindle). Not every combination of impeller and motor size is available.

Model	Connection	Motor	Max. capacity	Standard duty point (impeller T unless noted)
SMX-F220	25 x 25 mm	0.37 kW	90 L/min	80 L/min at 7.5 m (impeller V)
SMX-F221	25 x 25 mm	0.75 kW	115-125 L/min	100 L/min at 12.5 m
SMX-F222	25 x 25 mm	1.5 kW	155 L/min	100 L/min at 12.5 m
SMX-F441	40 x 40 mm	0.75 kW	135 L/min	100 L/min at 13.5 m
SMX-F442	40 x 40 mm	1.5 kW	280 L/min	150 L/min at 11.8 m
SMX-F542	50 x 40 mm	1.5 kW	155 L/min	100 L/min at 19.8 m (impeller V)
SMX-F543	50 x 40 mm	2.2 kW	410-440 L/min	250 L/min at 16.0 m
SMX-F545	50 x 40 mm	4.0 kW	410-440 L/min	250 L/min at 16.0 m

Note: where a range is shown, the lower value is for impeller V and the higher value for impeller T. Values are for 50 Hz.

Minimum flow, because the pump must not run continuously against a closed discharge: 10 L/min for SMX-F22 and SMX-F44, and 20 L/min for SMX-F54. The suction pipe must have the same diameter as the pump inlet port and must be shorter than 4.7 m; otherwise the self-priming performance can be affected, or priming can even be prevented. Always prime the pump before the first operation, and keep a 10% allowance on the motor output (shaft power x specific gravity x 1.1).

Applications

The SMX-F is used for strong acids and alkalis and other aggressive chemicals, to pump liquid up from underground tanks or pits (chemical plant, waste plant), to pump up and out from the top of a tank or tanker truck (for example etching and plating chemical from a chemical bath), and to transfer chemical from tank to tank, such as from a main tank to a daily tank or from a drum to a tank.