求翻译：⑹润滑、密封、冷却和液压等系统的管道应清洗洁净保持畅通；其受压部分应按设备技术文件的规定进行严密性试验。当无规定时，应按现行国家标准《工业金属管道工程施工及验收规范》的规定执行。是什么意思？

⑹ lubrication, sealing, cooling and hydraulic piping systems should be cleaned to maintain smooth flow of clean; the pressure equipment technical documentation should be part of the provisions of leak test. When there is no requirement, should be the existing national standard "industrial metal pipe

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⑹System and so on lubrication, seal, cooling and hydraulic pressure pipelines should clean the pure maintenance to be unimpeded; Its unit under pressure should carry on hermeticness experiment according to the equipment technology document stipulation.When random fixed time, should according to the

⑹ lubrication, sealing, such as cooling and hydraulic system piping should be thoroughly clean to maintain open; pressure on its part should be according to the provisions of the technical documents for air tightness test. When you are not required to follow existing national standards of the provis

⑹ lubrication, sealing, cooling and hydraulic piping systems should be cleaned to maintain smooth flow of clean; the pressure equipment technical documentation should be part of the provisions of leak test. When there is no requirement, should be the existing national standard "industrial metal pipe