Method for steam turbine halfshell alignment

A method of aligning a component within a steam turbine having an inner and an outer shell, comprising the steps of:

• removing an upper portion of said outer shell;
• removing an upper portion of said inner shell;
• determining a left total elevation value for said component by summing an elevation of a point on a left side of said outer shell corresponding to said component with an elevation of a left support of said component, and subtracting an elevation of a point on a left side of said inner shell corresponding to said component;
• determining a right total elevation value for said component by summing an elevation of a point on a right side of said outer shell corresponding to said component with an elevation of a right support of said component, and subtracting an elevation of a point on a right side of said inner shell corresponding to said component;
• adjusting said component by a predicted vertical offset, said predicted vertical offset being equal to one-third of an average between said left and right total elevation values for said component;
• and
• replacing said upper portions of said inner and outer shells, whereby said replacement improves an alignment of said component.

A method of aligning a component within a steam turbine having an inner and an outer shell, comprising the steps of:

• removing an upper portion of said outer shell;
• removing an upper portion of said inner shell;
• determining a left total elevation value for said component by summing an elevation of a point on a left side of said outer shell corresponding to said component with an elevation of a left support of said component, and subtracting an elevation of a point on a left side of said inner shell corresponding to said component;
• determining a right total elevation value for said component by summing an elevation of a point on a right side of said outer shell corresponding to said component with an elevation of a right support of said component, and subtracting an elevation of a point on a right side of said inner shell corresponding to said component;
• adjusting said component by a predicted transverse offset, said predicted transverse offset being equal to one-half the absolute difference between said left and right total elevation values;
• and
• replacing said upper portions of said inner and outer shells, whereby said replacement improves an alignment of said component.