Welded On Serrated Finned Tube, The fin strip is wound spirally onto the tube and welded continuously to the tube along the spiral root. As per type "WO", but fins are serrated.

Materials:
- Base tube: Carbon Steel, Low Alloy Steel, Stainless Steel, Nickel Alloys, Nickel Alloys
- Fins: Carbon Steel, Low Alloy Steel, Ferritic Stainless Steel, Austenitic Stainless Steel

Fields of application:
Fired Heaters, Heat Exchangers, Boilers, Pre-Heaters, Coolers, Heat Pipes, Dryers, and Heaters.