1. The plumbness tolerance of tubesheet sealing face to center axis shall be within 0.30mm.

2. The plumbness tolerance for tube hole center axis to tubesheet sealing face shall be not exceed 0.05mm.

3. The distance for more than 96% of tube hole-bridge of the tubesheet must be exceed 7.80mm,not less than 4.48mm for 4% of tube hole-bridge.

4. Tube sheet hardness ≥ 200HB.

5. Sharp corners should be inverted obtuse.