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What are the common specifications of the helical tube？
| Thickness of Wall | 5mm-16mm |
| Length | 9mm-12m |
| Outer diameter | 219mm-1620mm |
| Technique | SSAW welded |
| standard | API Spec 5L,GB/T 9711.1-1997,GB/T 9711.2-1999,SY/T5037-2000,ASTM |
| Material | Q235 Q345 L245 L290 L360 L450 |
| Applications | Transmission Mains, Treatment Plant Piping, Pump Station Piping, Power Plant Circulating Lines, Penstocks, Force Mains, Intakes and Outfalls, Aerial Crossings, Aqueducts, Trenchless Applications – HDD |