现场配管 onsite pipe fitting
冲洗 flushing
吹扫 purging/sweeping
气密 air tightness
水压试验 hydraulic pressure test
单体试车 single unit trial running
水联运 commissioning with water
原始开车 first-run operation/initial operation/first-run commissioning/initial commissioning(这里，我的意见用：initial commissioning)