1. The forging shall be fabricated, inspected and accepted according to JB4726-2000,classⅢ.
2. The plumbness tolerance of tubesheet sealing face to center axis shall be within 0.30mm.
3. The distance for more than 96% of tube hole-bridge of the tubesheet must be exceed 9.6mm,not less than 5.4mm 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.
5. No crack and defect on all surface of which decrease strength and connection reliability is allowed.
6. Remove the burrs. |