1.The clad tubesheet should be fabricated, inspected and accepted according to NB/T47002.3-2009,class B1,the forging material according to JB4726-2000,class Ⅲ.
2. The tube sheet grooves machined surface with the axis perpendicular to the vertical tolerance is 0.60mm,the hole surface does not allow the vertical stripes. 3. The plumbness tolerance for tube hole center axis to tubesheet sealing face shall be not exceed 0.05mm.
4. The tube sheet after drilling holes to allow the bridge width 96% ≥ 7.234mm, 4% of the holes to allow the bridge width is 4.45mm. 5. The tolerance of the dimension for surface machined shall be in accordance with GB/T1804-2000 , grade m, other with grade c. |