Heat exchange system
A description is given of a heat exchange system comprising in combination, (A) a first tube system comprising a plurality of substantially parallel similar tubes, and (B) return members connecting similar ends of adjacent tubes to form a first fluid passage having inlet and outlet means adjacent opposite ends thereof, (C) a second tube system comprising a plurality of similar tubes of larger diameter than the tubes of said first system and respectively surrounding at least portions of the same between opposite ends thereof, and (D) additonal connecting means positioned inwardly from the outer ends of the tubes of said first tube system and connected between similar ends of adjacent tubes of said second tube system for intercommunication therebetween to form a second fluid passage having fluid inlet and outlet means surrounding the tubes of said first tube system; (E) the improvement comprising leak-conducting means substantially coaxial and coextensive with said tubes of said first tube system and comprising supplemental tubular wall means surrounding said tubes of the first system in spaced relationship thereto and having outer ends extending beyond the ends of the tubes of said second tube system, said supplemental tubular wall means having a continuous spiral groove roll formed therein to compress the bottom of said groove into firm thermal contact with said tubes of the first system without substantial decrease of the wall thickness of said supplement tubular wall means to provide a spiral passage arond the tubes of said first tube system for discharge of leaking fluid to atmosphere at opposite ends of said leak-conducting means to prevent contamination of fluids respectively in said first and second tube systems in the event of leakage openings occurring in any of the tubes on the interior of said second tube system.
- Assignee:
- Doucette Ind Inc
- Patent Number(s):
- US 4210199
- OSTI ID:
- 5112692
- Resource Relation:
- Patent File Date: Filed date 14 Jun 1978
- Country of Publication:
- United States
- Language:
- English
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