scavenging line
吹扫管线
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吹扫天然气管线 blow a line down
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氮气吹扫应同时包括空气管线和酸气管线路径。
This nitrogen purge should be routed through both the air line and the acid gas lines.
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此外，所有安全卸压阀、支线和仪表管线应进行干燥和吹扫处理。
Also all safety relief valve line branch line and tubing line for instrument will be dried and purged.
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