Iwaki NRD and RD Series Compact Canned Motor Pumps

Iwaki NRD and RD are small canned motor centrifugal pumps driven by brushless DC motors. They are compact, lightweight and quiet, and the seal-less construction removes the potential for shaft-seal leakage. The NRD series covers 13 model sizes from NRD-05 to NRD-100H, with a flow range of 5.1 to 140 L/min. As the Iwaki distributor in Turkey, Mikron Proses (Üsküdar, Istanbul) offers OEM and process selection, supply, installation and commissioning for these pumps.

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For other Iwaki pumps, see the Iwaki pump range.

NRD and RD are Iwaki’s seal-less canned motor pump series. Because there is no shaft seal, they are not exposed to seal leakage, and the brushless motor removes failures caused by brush wear, giving a service life equal to that of AC motors. The power voltage of both the NRD and the RD series is classified as safety voltage (50 V or less), which the catalogs say allows users to comply easily with global safety standards such as UL, CSA and CE. The RD-40 and RD-40X run on 24 VDC and are controlled with a 1-5 VDC signal.

Brushless DC motor and electronic flow control

Each pump has a built-in motor drive circuit. An external 1-5 VDC analog signal, or on some models a 400 Hz ±10% PWM signal (duty 0-100%), varies the flow rate electronically. The pump therefore needs no throttling valve to change its flow. Tachometer feedback (a rotation speed pulse output of 1 pulse per rotation) is available on NRD-08Z-P4 and NRD-70, 70X, 100, 100X and 100H, together with the variable input signal.

Model	Max. capacity (L/min)	Max. head (m)	Supply
NRD-05	5.1	4.1	24 VDC
NRD-08	7.9	11.5	24 VDC
NRD-08Z	8.0	19	24 VDC
NRD-12	13.6	7.4	24 VDC
NRD-20	19.5	8.5	24 VDC
NRD-30	23.5	11	24 VDC
NRD-40	25.0	15	24 VDC
NRD-40X	70.0	8	24 VDC
NRD-70	55	19.1	48 VDC
NRD-70X	112	9.3	48 VDC
NRD-100	64	22.2	48 VDC
NRD-100X	140	12.2	48 VDC
NRD-100H	70	26	48 VDC
RD-40 / RD-40X	25 / 70	15 / 8	24 VDC

Note: the maximum capacity is the flow at 0 m head and the maximum head is the shut-off head, for clear water at room temperature; values are average factory performance with an individual difference of ±10%. Source: Iwaki NRD catalog CAT-W 0068-11, NRD-70/100 catalog CAT-W 0262-01 and RD-40 catalog CAT-W 0084-03.

Materials and operating limits

The wetted parts are a GFRPPE (glass fiber reinforced polypropylene) casing, an impeller of GFRPP or GFRPPS, a spindle and thrust ring of alumina ceramic and a bearing of filled PTFE; the O-rings are FKM or EPDM. Liquid temperature is 0-80 °C and ambient temperature up to 50 °C, with different limits for some models, as listed in the specification above. The compact, lightweight and quiet construction suits low-flow applications that need integration into equipment rather than large process pumps.