1. 清管：pigging station 清管站 | pigging 清管 | piggy-back anchor 加重锚

2. 清刮：piggin 汲水桶 | pigging 清刮 | piggy backsystem 集装箱装法

3. 清洗器：self sealing bonnet 自密封阀盖 | pigging 清洗器 | buride type 埋入式

4. 用清管器清理：Support Centre;支助中心; ; | pigging;用清管器清理; ; | pig; go-devil; scraper;清管器;刮管器; ;

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