Acceptance Criteria for Gap between Steam Turbine Cylinder Joint Surface

For the empty buckle cylinder, tighten the 1/3 bolts according to the requirements of cold tightening, and check with a feeler gauge.

1. High pressure cylinder: 0.03mm feeler gauge shall not be inserted from both sides of the inspection.

2. Medium pressure cylinder: The 0.05mm feeler gauge is inspected from both sides of the inside and outside. Generally, it is not allowed to be inserted; the individual inserted part shall not exceed 1/3 of the sealing width of the cylinder flange.

3. Low pressure cylinder: The 0.05mm feeler gauge shall not be plugged through; at the same section of the flange, the total length of the plug from both sides of the inner and outer sides shall not exceed 1/3 of the width of the cylinder flange.