NEW JOHN CRANE SEAL RANGE PROVIDES IMPROVED PERFORMANCE ON NON-TURBO APPLICATIONS

Phil Black - PII Editor 30/11/2007

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John Cranes new range of non-contacting mechanical seals greatly improves performance on pump applications by reducing operational costs, enhancing reliability, increasing safety and extending seal life. Designed for non-turbo, large-bore rotating equipment applications the new Type 2800X dual seals feature patented new technology that provides environmentally-friendly and emission-free sealing.

The 2800X seals are designed for a wide variety of performance-critical applications. These include the contamination-free processing of extremely pure materials, the use of reactive or temperature-sensitive media where local process hot spots can cause unwanted chemical reactions, cold applications such as ammonia processing, and air/oxygen-sensitive processes where unwanted oxidation reactions could occur.

The seals feature spiral grooves machined into the seal head mating ring faces. As the pump shaft rotates a pressurised inert gas is injected between the faces and compressed as it flows into these grooves. The gas expands again as it leaves the spiral grooves and generates a force which separates the faces to create non-contacting operation. This minimises seal face wear, reduces running and repair costs and extends seal life.

A reverse pressure capability ensures that if the barrier gas fails the process pressure will close the seal faces, preventing any large-scale loss of process fluid to atmosphere. The result is safer and more environmentally-friendly operation, even under breakdown conditions.

For more information contact John Crane EAA, Trafford Park, Manchester

Tel: 0161 886 5993 Fax: 0161 872 1654

E-mail: louise.palmer@johncrane.co.uk Web: www.johncrane.co.uk