求翻译：焊接曾储存易燃、易爆物品的容器时，应根据介质进行多次置换及清洗，并打开所有孔口，经安全检测部门确认安全后方可施焊。是什么意思？

Welding has storage of flammable and explosive materials containers should be based on multiple media replacement and cleaning, and open all the holes, the security department to confirm the safety testing before welding.

正在翻译，请等待...

When the welding once stored up flammable, the high explosive cargo vessel, should carry on according to the medium replaces and the clean many times, and opened all manholes, after the safe examination department confirmed the security only then executed welds.

Welded storage containers of flammable, explosive materials, replacement and cleaning several times according to the media, and opens all openings, confirmed by the safety inspection departments safety only after welding.

Welding has storage of flammable and explosive materials containers should be based on multiple media replacement and cleaning, and open all the holes, the security department to confirm the safety testing before welding.