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seal和packing的区别

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seal和packing的区别
两者都有密封的意思,区别是什么?
seals and packing
这两个词就这么放在一起怎么翻译?密封和打包?我这是用于石油化工的翻译,段落如下:
seals and packing
Seal gas nitrogen should be provided for maintaining a positive pressure on the compress or seals and/or packing to prevent inclusion of air.If nitrogen is not available,consult the MSP Technology Center for acceptable alternative design.
Packing leakage into the area between the piston cylinder and crank case also known as the distance piece shall be vented to a flare system.
seal强调‘封’,比如一个大口袋,最后的封口封起来,这个动作用seal
packing是普通意义上的打包,比如你要出门,收拾行李打包,就用这个packing