Longitudinal finned tubes in 316L for a chemical plant exchanger, produced to a customer drawing with tight straightness and weld requirements.
Requirement
The duty involved a corrosive chemical stream and a high-velocity gas side. Longitudinal fins were chosen to keep the gas channel open and to allow mechanical cleaning between the fins.
Specification
| Item | Specification |
|---|---|
| Base tube | AISI 316L, 60.3 mm OD × 3.0 mm |
| Fin | 316L, 20 mm height, 8 fins, 2.5 mm thickness |
| Attachment | Continuous weld, full penetration |
| Straightness | 1 mm per metre |
| Inspection | Dye penetrant on all fin welds |
Execution
The fins were formed and welded individually, then the assembly was straightened and inspected. Each tube was dye-penetrant tested along the full weld length and packed with protective end caps.
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