For the large number of diameter and wall thickness, a simple sliding slit guide piece may as well meet the requirements. For large diameter and thick pipe wall, the guide roll with rotating slot is usually chosen. Both types may supplement the vertical rollers and provide special control for the rebound of the service clothes.
Otherwise, part of the high-frequency sensory current of the thick-walled spiral steel pipe will flow along the wrong path upward along the slit guide rather than downward along the V-shaped surface.
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DIN 1629 St37 St52 Seamless Steel Pipes
Boiler Tube Size Chart
API 5L SSAW Steel Pipe Definition and Grades
