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[编者按]该部份是美国API标准“炼油厂仪表和控制系统安装手册”第一分册第十四章。本章译文从未出版过,故刊登供设计者参考。
[Editor’s note] This section is the fourteenth chapter of the first volume of the American API Standard “Installation Manual for Refinery Instrumentation and Control Systems.” The translation of this chapter has never been published, it is published for the designer’s reference.