在一些更大的系统中，例如那些使用很长的传送带或管道系统，应该对流程图和鉴定阀门的管道系统图和书面的清洗程序进行检查。
In larger systems, such as those employing long transfer lines or piping, check the flow charts and piping diagrams for the identification of valves and written cleaning procedures.
该管道还自带清洗和冲水系统，来保持管道的干净。
It also has a cleaning and flushing system to keep the pipe clean.
该技术同样适用于石油化工行业油类及其他外档液体产品储运系统的管道清洗。
And equally, it applies in petroleum, chemical industry, oil and other liquid prod - uet's preservation and transportation system's pipeline cleaning.
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