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。
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.
材料必须符合已有的国标或行业的产品标准规定，以国家认可的检测机构出具的检测报告为准。
Materials must conform to the existing national standards or industry product standards, to nationally recognized testing agencies issued test report shall prevail.
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