Abstract: The severe wear of shaft gland sleeve is widely existed in middle and small turbine units due to frequently startingup. In most thermal power plants, all front gland seals (rear gland seals) were adjusted according to the upper limit of specified value of the clearance given by manufacturer or larger value, and this caused the steam leakage of front gland seal to increase gradually, even caused the quality of turbine oil to deteriorate seriously. An adjustment method, in which the specified value given by manufacturer is combined with the maximum allowable value during hot startingup, was proposed, and the wear between the moving and static parts of gland seal was avoided successfully by the method.

Key words: gland seal clearance, adjustment, specified value, maximum allowable value, wear