1. The tubesheet should be fabricated, inspected and accepted according to GB151-1999”Shell and tube heat exchanger”.
2. Tubesheet material Q235-B of the sulfur and phosphorus content of components required to meet the pressure vessel pressure timber requirements, P <0.035%, S <0.035%.
3. Expansion of the tube sheet hole surface without affecting the strength and tightness defects.
4. The unlabeled tolerance shall be in accordance with GB/T1804-2000 , grade m, and any tolerance between adjacent pore is less than ± 0.5mm, pore vertical deviation is less than 30.
5. After processing to remove burrs. |