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I visit various state prisons in New York State for prison ministry. What I've seen at a few prisons is big (12") steam pipes running here and there across the prison. When I ask whether this makes sense, I'm told that yes, it's very efficient. I find this hard to believe. When I bang on them, it sounds like metal, suggesting they are not insulated. The pipes used to be underground but they got sick of fighting underground steam leaks and moved everything outside.
Does this make sense to you guys?