While positive displacement rotary gear pumps have been around for years, the designs featured metallic constructions, which required the use of high-grade alloys (Alloy 20, Hastelloy C, etc.) for aggressive chemical applications. These material requirements required larger capital investments than other technologies chosen for these applications. This has limited the application of rotary gear pumps in chemical metering and transfer applications. However, a completely non-metallic magnetically driven (mag drive) gear pump has been developed that solves many of the critical issues faced in chemical transfer and metering.

Non-metallic magnetic drive pumps include all wetted parts in non-metallic construction including ETFE housings, PTFE gears, and alumina ceramic shafts. The non-metallic construction extends to the containment can portion of the mag drive. This is critical not only for chemical resistance in harsh environments, but also to eliminate energy loss and heat increase that can be caused by eddy current losses in metallic gear pumps. Bearings are also offered in both carbon graphite and silicon carbide constructions. These material offerings allow the pumps to accommodate almost all the hazardous and classified chemical applications that a plant operator or engineer would encounter. They are also cost effective. A non-metallic mag drive pump can cost up to 30 percent less than a comparable alloy pump and 60 percent less than Hastelloy C.

In addition to material compatibility, the pumps offer sealless mag drive technology. This eliminates the need for a mechanical seal, the potential for leaks and the need for frequent maintenance. This also ensures that no emission issues arise when regulated chemicals are involved.

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2012-08-31

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