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Purpose of exhaust gas turbocharger labrinth seal and packings

Oil labyrinths or labyrinth seals are used to seal the lubricating oil so as to prevent leakage of lubricating oil from the turbocharger .
Labyrinth packing is used to seal exhaust gases within the turbine discs. Sealing air channeled from the scroll is also used along with the seals and packings in order to prevent oil and gas leakage from inside the turbine disc during the normal operations.
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