A reactant header 18 is provided at {HEAD ~ the inlet side} 14 of {TAIL ~ the tube bundle} and a product header 20 is provided at the outlet side 16 of the tube bundle 
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A reactant header 18 is provided at { HEAD ~ the inlet side } 14 of { TAIL ~ the tube bundle } and a product header 20 is provided at the outlet side 16 of the tube bundle
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH