.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 4.65mm,not less than 4.25mm 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.Tubesheet surface have no cracks and other effects of tubesheet strength or connection reliability defects. 5.Remove burrs. |