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Infiltrazione d'aria all'interno
el.	in-leakage of air; inward leakage of air the external glands are either to prevent the leakage of steam which is at a higher pressure than the atmosphere,or to prevent the in-leakage of air when the pressure of the steam in the turbine casing is lower than atmosphere.The gland at the low-pressure or exhaust end of the turbine has to seal the casing against the in-leakage of air