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在压力容器定期检验中,依据《压力容器定期检验规则》如发现均匀腐蚀,按剩余壁厚(实测壁厚最小值减去至下次检验期腐蚀量)强度校核合格的,不影响定级;经过补焊合格的,可以定为2级或3级。如发现局部腐蚀,腐蚀深度超过壁厚余量的,应当确定腐蚀坑形状和尺寸,并且充分考虑检验周期内腐蚀坑尺寸的变化,进行无量纲参数G_0计算,如果G_0<0.10,则该凹坑在允许范围内,否则评定为4级或5级。
Periodic inspection of pressure vessels, according to “regular inspection rules for pressure vessels” found uniform corrosion, according to the remaining wall thickness (measured minimum wall thickness minus the amount of corrosion to the next inspection period) to verify the intensity, does not affect the grading ; After welding qualified, can be set for 2 or 3. If local corrosion is found, the depth of corrosion exceeds the thickness of the wall thickness, the shape and size of the corrosion pits should be determined and the size of the corrosion pits in the inspection cycle should be taken into full consideration to calculate the dimensionless parameter G_0. If G_0 <0.10, Within the allowed range, otherwise assessed as 4 or 5 levels.