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压力容器封头的有效厚度能否满足强度要求是压力容器安全运行的关键。压力容器计算中通常采用封头的名义厚度减去腐蚀裕量与钢板厚度负偏差来计算封头的有效厚度。当图样上标有封头最小成形厚度时，采用这种方法进行容器的最大允许工作压力与开孔补强计算时，结果偏大，而卧式容器封头的应力计算结果偏小，应采用设计所需的最小成形厚度减去腐蚀裕量作为封头的有效厚度，才能保证压力容器的使用安全。“,”The effective thickness of heads for pressure vessel what can meet the strength requirements is the key for safe operation of pressure vessel. It is often used to calculate the effective thickness of head in pressure vessel calculation that the nominal thickness minus the corrosion allowance and the thickness of the steel plate negative deviation. When the head’s thickness minimum forming was marked, the maximum allowable working pressure and opening reinforcement for pressure vessels calculated by this method were relatively large, while the head’s stress is relatively small for the horizontal vessel. It should used the minimum forming thickness minus the corrosion allowance as effective thickness of the head, to ensure the safe use of pressure vessels.