Optimizing Efficiency with Second-Hand Sealing Rings
Release time:
2026-04-09
Source:
Sealing rings (labyrinth, carbon, or brush types) control leakage along turbine rotors and diaphragms. While often replaced new, second-hand sealing rings can be reused if properly inspected. This article explains damage patterns, inspection criteria, and cost-saving opportunities for used seals.
Sealing rings in second-hand steam and gas turbines typically suffer from tooth wear, coating loss, or spring degradation. Labyrinth seals show rounded teeth and enlarged clearances, directly increasing steam or gas leakage. Carbon rings may develop crazing or breakage. Brush seals lose bristle tension over time.
Before reusing a second-hand sealing ring, measure its inner diameter at multiple points. Clearance increase beyond 0.3 mm (for small seals) or 0.5 mm (for large seals) generally disqualifies reuse. Labyrinth teeth with minor burrs can be re-cut on a lathe, but only if the remaining tooth height exceeds 1.5 mm. Carbon rings should never be reused if cracked.
For segmented labyrinth rings, check that all segments spring back evenly. Weak springs cause blow-by. When reusing sealing rings, install them in lower-pressure stages where leakage tolerance is higher. High-pressure stages always benefit from new seals. A practical approach is to purchase a second-hand rotor with its original seals as reference, then replace only the most worn ones. This balances cost and performance.
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