Through analysis

it is considered that the main causes resulting in larger differential expansion of a turbine unit are the interstage steam leakage and the fled flow of front shaft-packing’s leakage steam. Hence

some remedical measures for reducing steam leakage and fled flow have been taken

namely using metallic mending compound to mend sleeves of diaphragms NO.5 and 6

as well as depresion slots matched with them in the steam casing

grinding and aligning

and eliminating the non-uniformity of shaft-packing’s clearance etc.

obtaining remarkable effectiveness.