Causes of failure are analyzed for heat exchangers widely applied in refining units and chemical units from the viewpoints of corrosion and sealing element failure.

针对炼油、化工装置中应用广泛的换热器的失效问题，从腐蚀、密封件失效等方面入手，分析了换热器的失效原因。

youdao

Sealing requirements for diesel engines, fuel systems and chemical plants.

适用于柴油发动机、燃料系统及化工厂的密封需求。

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Sealing up PC production processes is major success story for chemical engineering. For example the bulk supply of penicillin in World War II has helped many.

制药生产工艺的放大是化学工程一个重要的成功的范例，例如在二次世界大战中，青霉素的大批量供应拯救了很多人。

youdao

If you're worried about biological or chemical attacks, he said, consider sealing off doors and windows in a room in your house, as they do in Israel.

CNN: gas mask