There are also a plurality of {HEAD ~ heat exchange tubes} extending through {TAIL ~ the heat} exchanging chamber between first and second tube sheets and connected to same 
There are also a plurality of { HEAD ~ heat exchange tubes } extending through { TAIL ~ the heat } exchanging chamber between first and second tube sheets and connected to same
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH