I am starting to recognize these sketchbook backgrounds. The weird thing is that there's nothing wrong with this. It just shows how you used to do stuff like this. I have tons of notebook paper with this stuff on them. I'm glad we have some similarities. They're quite detailed for pipes.
In fact, it seems like most of this stuff isn't even pipes. I notice some outlets and tables of some sort. There's a broken computer which stands out nicely. You should have just called this random machinery. I guess that wouldn't be as good of a title.