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FR68/90 Elastomer from James Walker Offers Class-leading Seal Stress Retention

Published on 2011-04-25. Author : SpecialChem

When launched last year, FR68/90 carried a clear performance advantage over the best options available in terms of rapid gas decompression (RGD) resistance, having established '0000' Norsok ratings with an 8.40mm section at 100°C and 5.33mm section at an elevated temperature of 150°C.

Now, new RGD test results have revealed zero defects at a 10.00mm section following rapid gas decompression testing at 100°C (212°F) using a pressure of 150bar (15MPa) and a decompression rate of 35bar/minute (3.5MPa/minute). This is well in excess of the 20bar/minute industry standard demanded by the Norsok M-710 test regime. The latest testing is part of an ongoing programme to map out the full performance envelope of the James Walker New Generation materials.

FR68/90 offers class-leading rapid gas decompression resistance

Maximising operational safety

Whilst it is possible to claim a pass on the Norsok rapid gas decompression test with a rating such as '3321', the material is sustaining a significant amount of damage in the process. A material passing at this level could potentially have cracks reaching up to 80% of the way across its section and would therefore be operating on the edge of failure with little or no safety margin.

In order to maximise operational safety in terms of RGD resistance, James Walker utilises the '0000' rating (zero damage) as the key benchmark for the company's own materials and is continuing to develop the New Generation polymer architecture to extend the boundaries of elastomer performance in this area.

No compromise in performance

Although the RGD performance of FR68/90 is in a different league to any existing elastomer technology, this exceptional performance has not been achieved at the expense of other material characteristics. FR68/90 retains superior flexibility for ease of fitting, offers class-leading seal stress retention and is James Walker's premium fluoroelastomer (FKM) material for RGD resistance where contact with amines, H2S, hot water or steam is an important secondary operational consideration.

New capabilities for elastomeric seals

Prior to the successful development of FR68/90, elastomers could not offer the required RGD performance at large sections and more expensive options had to be pursued, often involving the complex and costly reengineering of components to accept solutions such as spring energised PTFE seals which are more sensitive to surface finish and more difficult to install.

About James Walker

James Walker is a dynamic global manufacturing organisation that supplies a vast range of high performance fluid sealing products and associated knowledge-based services to virtually every sector of industry. The activities range from research and development, product application, manufacture and supply, to plant monitoring, on-site maintenance and seal refurbishment. An intimate knowledge of the industrial plant and processes used by the customers worldwide enables the company to solve their fluid sealing problems with best value systems designed to minimise total cost of ownership.

Source: James Walker


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