cast-iron bend
泵壳，叶轮，电机壳和固定底座弯头都应该采用符合美国材料试验协会ASTM A48级别30致密铸铁制造。
The pump casing, impeller, motor housing and stationary base elbow shall be manufactured of close-grained cast iron, ASTM A48, Class 30.
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