The modular heat exchanger can include {TAIL ~ U} shaped fittings to interconnect said flow tubes so a number of {HEAD ~ modules} can be placed in series to circumferentially extend around large tanks or the like 
The modular heat exchanger can include { TAIL ~ U } shaped fittings to interconnect said flow tubes so a number of { HEAD ~ modules } can be placed in series to circumferentially extend around large tanks or the like
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH