1. The plumbness tolerance of tubesheet sealing face to center axis shall be within 0.250mm.
2. The distance for more than 96% of tube hole-bridge of the tubesheet must be exceed 6.25mm,not less than 4.45mm for 4% of tube hole-bridge.
3. The tolerance of the dimension for surface machined shall be in accordance with GB/T1804-2000 , grade m, other with grade c.
4. No crack and defect on all surface of which decrease strength and connection reliability is allowed.
5. Remove the burrs. |