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Questionable near boiler piping install
I have one pipe steam system with a new boiler being installed. The old boiler, circa 1946 was only fired by me once, briefly, and the system did run quietly though it too about an hour to get any steam up from that behemoth. Beyond that i don't know how it behaved. At any rate, I got home from work to discover that the near piping had been done in copper, which set off immediate red flags though I hadn't thought about it when the contract was drawn up, unfortunately for me.
The existing piping seems to be a hybrid of parallel flow in the large main with counterflow branching off of that as well as two seperate counterflow lines with drips. Does the new piping make sense layout wise? The copper seems to be true and not pitched at all. Not pictured is the return loop which runs at the level of the main at the far end, drops should half way down for about 10 feet, then drops again the the level shown. There also don't appear to be any vents in the basement.
My question is, how bad are the problems with the work being done? I understand the copper joints won't hold up long term, but I'm not sure whether the contractor knows what they're doing at all at this point.