The systems I saw were actually a series of looped loose coils that were buried in sand and covered in sand, a few feet underground. Depending on the 'tonnage' of the system the number of loops would be adjusted. As I recall the loops were a flexible PVC, like the type used in the irrigation systems here. All were connected in parallel to common input and output headers that went to the compressor unit. I think there were valves on each loop in case of a leak so that loop could be isolated.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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