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 0.40mm.
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 on bolt circle diameter and bolt hole spacing shall be ±0.6mm,the tolereance on random bolt hole spacing shall be ± 1.5mm.
5. The tolerance of the dimension for surface machined shall be in accordance with GB/T1804-2000 , grade m, other with grade c. |