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Leak in copper oil pipe embedded in concrete
I have an old house with a cooper oil pipe embedded approx. 3" below the concrete floor running from the above ground oil tank to the burner, It's approx 8"-10'. Subsequently I learned we have a serious oil leak that occurred in the copper pipe. The oil went into the ground and not up through the concrete basement floor. Only after the oil company did a backflow test did they determine the leak. I really feel the oil company is at fault as they had a responsibility to inform the home owner of the potential hazard of copper pipes embedded in concrete. Knowing the issues back in the day when radiant heating was the craze, copper pipes were found to cause leaking in the concrete. From what I have been reading, the copper pipe should have allowance for "lateral thermal expansion" and/or the pipe in another tube for added protection. So i'm looking for any articles or back up on this being a problem. Any info is appreciated.