Application of zinc ring at the iron cap open and zinc sleeve on the steel foot can improve the anti-corrosion property.

铁帽口采用锌环和钢脚采用锌套，以提高抗腐蚀性能；

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While DC power transmission requires high anti-fouling property for insulators and causes serious corrosion to their metal attachments (iron cap and steel foot).

但直流输电对绝缘子的防污秽性能要求高，对其金属附件(铁帽和钢脚)腐蚀厉害。

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The submersible motor enclosure including frame, end brackets, flanges and cap assembly shall be constructed of close-grained cast iron, ASTM A-48, Class 30 or better.

潜水电机壳体，包括机架，尾轴承架，法兰和罩盖总装，必须采用符合美国材料试验协会ASTM A - 48类别30标准的、密实的铸铁或更好的材料制造。

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