A severe deformation of steam cylinder was occurred on a 65MW steam turbine due to water-incoming disaster

making the gap between joint surfaces of upper and lower casings to be too large

the pin-holes to be misplaced

and the lower casing to be expanded outward. The method of solution was to apply heating rectification to the said cylinder

i.e. to lay infrared heating plate on inner surface of the said cylinder

the basic requirements for this being fast temperature rise and big temperature difference. This method is easy to realize on the site

and the time duration being only three hours. Practice shows

the method has certain rectification effect for deformation of steam cylinder

especially having better effect for cylinder deformation caused by excessive thermal stress.