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1) if defects such as missing coating, sagging, and wrinkled skin are found during coating, they should be dealt with in time, and the wet film thickness should be measured with a wet film thickness gauge. before each coat is applied, the appearance of the previous coat should be inspected.
2) coating appearance inspection: the surface of the paint film is required to be smooth and consistent in color, without defects such as spray leakage, sagging, wrinkling, air bubbles, pinholes, cracks, etc.; there is also no impurity and no segregation.
3) inspection of the coating thickness of epoxy powder anti-corrosion coated steel pipe: the thickness of the paint film is measured with a magnetic thickness gauge, measured every 1.5m on the two ends and the middle of the single-section steel pipe, and the thickness of the paint film should meet two 85 %, that is, the thickness of 85% of the measuring points should reach the specified value of the design requirements, and the minimum thickness of the measuring points that cannot reach the thickness should not be lower than 85% of the design thickness.
4) inspection of adhesion of epoxy powder anti-corrosion steel pipe coating: use a hard tool to draw a knife edge with an angle of 60° on the coating for random inspection. then tear off the tape quickly in the vertical direction, and observe the scratches after tearing off the tape, and the coating should not peel off. it can also be checked on a test panel sprayed under the same conditions.