How do you bend 2 coaxial tubes inside each other for a heat exchanger?
To maintain the temperature of an arm above molten glass (1100°C), our customer needed to circulate a coolant through the arm in Ø60.3 OD tubing.
This heat exchanger system cools the outer shell by supplying refrigerant through the Ø33.4 inner tube. A ” double-skin ” or ” double-shell ” solution involving the welding of elbows and half-shells was not an option, due to the stresses exerted on this part.
Lyon Cintrage was asked to find a solution with the following objectives:
- Bending without welding
- Concentricity / 1 mm coaxiality requirement met in the bent areas
- Ovalization less than 8% on inner tube Ø33.4 and outer tube Ø60.3
The bottom part has been cut with a grinder to show the passage of the inner tube.
Thanks to the implementation of a special process and the dedication of our technicians, Lyon Cintrage was able to meet his requirements and have them validated by X-ray and then by our customer.
