Slowing natural wear of downstream carbon rings

Paul Boughton

Standard carbon rings are the traditional sealing method for process steam turbines. Their weak and brittle design causes carbon rings to wear quickly and become ineffective within a short period of time.

When carbon rings fail, it leads to increased steam loss and high maintenance costs.

The Inpro/Seal Sentinel FBS was developed as a drop-in replacement to carbon rings. Proven to extend seal life by three times normal maintenance intervals, the Sentinel FBS utilises brush seal technology. Its design is comprised of densely packed and flexible metallic bristles that 'bend' with changing clearances between rotating and stationary surfaces. The brush serves as the primary shaft seal while a carbon element provides face sealing in the turbineʼs casing.

This technology offers an extra layer of protection that slows down the natural wear of downstream carbon rings and provides predictable leakage over an extended operating life. Its Plug-n-Play split design is a direct replacement of a carbon ring without necessitating rotor removal or costly
casing modifications.

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