Week 7 Journal
The pipelines are made by alumium and rigid plastic, the reason for use these things is they are not easy get to rust, because in the future they will be covered by ceiling, so they should be used as long as possible. They are connected by iron steels to the top of room, these steels help to support these pipelines. I am not sure about why people use copper for some pipelines, as i know copper will grow some green things, i think stainless steel should be better.
Cooper pipelines are connected by weld.