The pump casing, impeller, motor housing and stationary base elbow shall be manufactured of close-grained cast iron, ASTM A48, Class 30.
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。
This article can provide the theory base for establishing the cementing quality evaluation method of adhering sand casing with considering the effect of glue layer thickness.
本文研究内容可以为建立考虑胶层厚度影响的粘砂套管固井质量评价修正方法提供理论基础。
All devices for switching, protecting and controlling are installed on a base plate installed in a separate steel sheet casing.
所有的开关，保护，控制装置皆分别装置在各控制盘上。
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