Heat exchanger

Claim 1

IN A HEAT EXCHANGER INCLUDING A SHELL HAVING A FRONT END AND A REAR END AND AN OPENING THROUGH THE SHELL, A PLURALITY OF INNER TUBES EXTENDING WITHIN THE SHELL AND A CONDUIT MEMBER OUTSIDE THE FRONT END OF SAID SHELL CONNECTED TO SAID TUBES, A UNION FOR FORMING A SEAL BETWEEN THE EXTERIORS OF SAID TUBES, UNION FOR FORMING A SEAL SAID SHELL AND FOR CONNECTING THE INTERIORS OF SAID TUBES TO THE INTERIOR OF SAID CONDUIT MEMBER, SAID SHELL HAVING MEANS ADJACENT THE OPENING THEREOF FOR CONNECTING SAID SHELL TO SAID UNION OF END PORTION OF THE FRONT OF SAID SHELL, SAID UNION COMPRISING: A FITTING TO WHICH SAID INNER TUBES ARE CONNECTED IN LEAKPROOF RELATION, SAID FITTING BEING SMALL ENOUGH IN CROSS SECTION TO PERMIT THE FITTING TO BE PASSED WITHIN AND ENTIRELY THROUGH SAID SHELL AND HAVING AN INNER END PORTION LOCATED AT SAID SHELL END PORTION AND AN OUTER END PORTION PROJECTING OUTWARDLY AWAY FROM SAID SHELL END PORTION FOR A SUBSTANTIAL DISTANCE, SAID FITTING INCLUDING A TUBE SHEET PORTION CLOSING THE CROSS SECTION OF SAID FITTING AND EXTENDING SUBSTANTIALLY TO THE OUTER END OF SAID FITTING AND HAVING OPENINGS THERETHROUGH AT WHICH THE ENDS OF SAID TUBES ARE FIXED IN LEAKPROOF RELATION, SAID FITTING HAVING AT LEAST ONE CAVITY THEREIN EXTENDING FOR A SUBSTANTIAL PORTION OF THE LENGTH OF SAID FITTING FROM ITS INNER END TO SAID TUBE SHEET PORTION AND SURROUNDING SAID INNER TUBES IN SPACED RELATION TO SAID TUBES; MEANS DEMOUNTABLY SECURING THE INNER END PORTION OF SAID FITTING TO SAID SHELL MEANS AT THE END PORTION THEREOF AND MEANS SEALING THE EXTERIOR OF SAID FITTING TO THE INTERIOR OF SAID SHELL END PORTION; AND MEANS LOCATED AXIALLY OUTWARDLY AWAY FROM SAID SHELL END PORTION AND INDEPENDENT OF SAID FIRST MENTIONED MEANS FOR DEMOUNTABLY SECURING SAID CONDUIT MEMBER TO THE OUTER END PORTION OF SAID FITTING AND MEANS SEALING THE INTERIOR OF SAID CONDUIT MEMBER TO THE INTERIORS OF SAID TUBES, THE OUTER END OF SAID FITTING BEING EXPOSED ONLY TO THE PRESSURE OF THE FLUID INSIDE SAID INNER TUBES AND SAID CAVITY WITHIN SAID FITTING BEING EXPOSED ONLY TO THE PRESSURE OF THE FLUID OUTSIDE SAID INNER TUBES AND INSIDE SAID SHELL.