外壁腐蚀
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No corrosion allowance is required for such parts not in contact with the inside fluid as the outside surface of shell, skirt, support lugs and so on, except for anchor bolts.
对于不同内部介质接触的部件，如外表面、防护罩及支承凸缘等不需腐蚀余度，地脚螺栓除外。
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