> They were labeled

Were they? It says they had labels some distance down the pipe, but they weren't labeled at the point where the hoses connected where someone could actually read it.

> Every chemical can't have a different connecter.

Every chemical doesn't have to have a different connector. Maybe just ones that will cause a dangerous reaction if mixed.

> I count 5 - 7 connections, they can't all be behind a gate, so there is no hard rule.

Sure. Again, a good rule of thumb would be to separate the ones that could cause rapid death.

> They actually want a 'written' policy to stop people coming in.

So no fire code issue then.