1) If defects such as missing coating, sagging, and wrinkling are found during the coating of epoxy powder anti-corrosion steel pipes, they should be handled in time, and the wet film thickness gauge should be used to measure the wet film thickness. The appearance of the previous coating should be checked before each layer of coating.

2) Appearance inspection of epoxy powder anti-corrosion steel pipe coating: The paint film surface is required to be smooth and uniform in color, without defects such as missing spraying, sagging, wrinkling, bubbles, pinholes, cracks, etc.; there are no impurities and no segregation.

3) Thickness inspection of epoxy powder anti-corrosion steel pipe coating: The paint film thickness is measured with a magnetic thickness gauge. At the two ends and the middle of the single-section steel pipe, one point is measured every 1.5m on the circumference. The paint film thickness should meet two 85%, that is, the thickness of 85% of the measuring points should reach the specified value of the design requirements. For the measuring points that do not reach the thickness, the minimum thickness value should not be less than 85% of the design thickness.

4) Adhesion inspection of epoxy powder anti-corrosion steel pipe coating: Use a hard tool to cut a 60° cut on the coating for spot inspection. The cut should penetrate the coating directly to the substrate. Use tape to stick the cut part, and then quickly tear off the tape in the vertical direction. After tearing off the tape, observe the scratched part. The coating should not peel off. It can also be checked on a sample sprayed under the same conditions.