Non-contact type 2800X sealing in non-turbo use

A new John Crane brochure describes the Type 2800X non-contacting dual seals, outlining their particular suitability to large-bore, non-turbo rotating equipment applications

The brochure also covers the patented new technology that allows Type 2800X seals to provide environmentally friendly and emission-free sealing, reduced operating costs, improved reliability, increased safety and longer seal life.

The 2800X seals are intended for use in many different 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 brochure explains how spiral grooves machined into the mating ring faces of the Type 2800X seal compress a pressurised inert gas that is injected between them.

The gas then expands again as it leaves the grooves and generates a force which separates the faces and so creates the non-contact operation.

The result is reduced face wear, lower maintenance and repair costs plus greater seal life.

By minimising the gap between the seal faces barrier gas usage is also reduced.

The environmentally-friendly operating characteristics of the new seals are also emphasised in the new publication, which describes how a reverse pressure capability ensures that if the barrier gas fails, the process pressure closes the seal faces and prevents any large-scale loss of process fluid to atmosphere.

Figures released by the Fluid Sealing Association also show that the Type 2800X seals reduce the cost of electricity used, and the associated greenhouse gas emissions, by 92% when compared to a conventional wet seal rotating at normal pump speeds and pressures.

Both standard and optional construction materials are explained along with the ability of the patented 2800X design to accommodate both lower and higher speeds and pressures than similar seals.

This is complemented by information on the different 2800X versions that meet and exceed the performance and design requirements of the latest American Petroleum Institute API 682 edition seal standard.

The option to retrofit the 2800X range into installations currently using the John Crane 2800, 2800ER, and 2800HP seals is also described.

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