Noncontacting seals reduce environmental impact
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John Crane product story
Edited by the Engineeringtalk editorial team
May 9, 2008
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.
John Crane has published details of its new Type 2800X noncontacting dual seals in a new brochure that outlines their suitability for large-bore, nonturbo rotating equipment applications.
The brochure also covers the technology that allows the 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 creates noncontacting 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 the 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.
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