1. The tubesheet should be fabricated, inspected and accepted according to JB4728-2000,class Ⅲ.
2. The plumbness tolerance of tubesheet sealing face to center axis shall be within 0.15mm.
3. The distance for more than 96% of tube hole-bridge of the tubesheet must be exceed 4.92mm,not less than 3.28mm for 4% of tube hole-bridge.
4. The tolerance of the dimension for surface machined shall be in accordance with GB/T1804-2000 , grade m, other with grade c. |