Abstract
Seals are found within the gas turbine’s internal air system. In summary, the seals serve to separate hot (working) gases from the cooling air required to ensure that the lubricating oil and bearings stay cool. Fully understanding their function in any one engine involves knowing the internal air system thoroughly. Some manufacturers are known for their superior cooling design. Better cooling adds cost to the overall engine in terms of both manufacture and performance efficiency. The priorities that different manufacturers set on this item are well known among seasoned gas turbine engineers who have worked with every major manufacturer’s engines. They are also well known to overhaul and repair shops that see the results of less cooling.
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