🔍 Key Concepts

• Different air seal designs used in gas turbine engines (carbon ring, lip-type, labyrinth, honeycomb) • Where sump and turbine areas are located and what they need to be protected from (oil leakage, hot gas ingestion) • How pressure differences and clearances are used to limit leakage in rotating machinery

💭 Think About

• Think about which seal type is best suited where there is a rotating shaft passing through a housing that must keep oil in and hot gas out • Consider which seal type relies on small clearances and multiple teeth rather than physical contact to control leakage • Ask yourself: in the harsh, high-temperature turbine area, which seal design is most commonly used in large gas turbines for durability and minimal wear?

✅ Before You Answer

• Verify which seal type is typically associated with contact sealing versus non-contact clearance sealing • Check which seal arrangement is commonly paired with a honeycomb stator surface to reduce leakage and rotor rub damage • Confirm which of the listed seal types you would most expect to find in the high-temperature turbine and bearing sump regions of a marine gas turbine