Electric Resistance Welded Steel Pipe Usage:Used for low pressure liquid delivery, such as water, ... , etc. ERW :Electric Resistance Welded pipe HFI:High Frequency Induction weld pipe EFW:Electric Fusion Welded Pipe Standard:API 5L, API 5CT, ASTM ... (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test. Mill Test Certificate:EN 10204 ...