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CNG pipe standard
Tube surface with 5-7 um zinc coated, which can keep 52~80 hour salt spray test without red rust.
Both ends of tube without rag, corner processing, smooth, absence of distortion.
CNG pipe is welding pipe with annealing treatment before zinc plating.
Inside of pipe should be no rust
Bending pipe with tools of 25mm radius, bending torsion should no more than 11NM