The third party inspection for extruded fin tubes

The inspector should carry out visual inspecton of the finished finned tubes at 10% random rate,the tubes should be clean with no residue left from the finning process and no swarf between them.

The dimension inspection for finished finned tubes should be conducted in accordance with fin tube drawing.

At 10% random rate, the inspection contents are overall length, finned length, bare end length, middle bare tube length, fin tube out diameter, fin heigh, fin thickness , fin pitch, all measureed values for dimension should beaccording to the drawing.