如有必要可用干燥氮气置换反应器，并保压。
If necessarily, nitrogen dryer exchange reactor could be used with keeping presure.
论述处置液化石油气汽车槽车事故使用氮气置换的必要性及氮气置换装置的组成、工作原理；
The paper expounds the necessity to use the nitrogen replaceable equipment in handling the problems with liquid-oil-gas-carrying tank cars by using nitrogen replaceable equipment;
报道上海城市燃气工程中，浦东新港首站至北蔡末站天然气供气管线的通球扫线、全线整体试压以及氮气置换的施工实例。
It reports a practical engineering of natural gas supply pipeline from Pudong New Port to Beicai Station in Shanghai metropolitan fuel gas project.
报道上海城市燃气工程中，浦东新港首站至北蔡末站天然气供气管线的通球扫线、全线整体试压以及氮气置换的施工实例。
It reports a practical engineering of natural gas supply pipeline from Pudong New Port to Beicai Station in Shanghai metropolitan fuel gas project.
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