1. Inspection: polyurethane insulation pipe shall have double performance of heat insulation and waterproof materials. The raw materials need to be rechecked after entering the site. The re inspection contents of spraying polyurethane mainly include density, compression performance, dimensional stability and impermeability.

2. Waterproof performance test: use water storage or rainwater to check its waterproof effect, no ponding or water leakage is allowed.

3. Spraying thickness inspection: use the method of inserting and measuring steel needle to check the thickness.

4. Surface flatness detection: measure with 1 meter ruler and wedge feeler gauge, and the allowable deviation is 5mm.

5. rigid polyurethane foam should be firmly bonded to the base layer, and 1 of the surface must be damaged, delaminated, bulging, holes and cracks.

6. polyurethane foam insulation should not be less than 60 kg / cubic meter in any position. The foam surface is smooth, non stick, no shrinkage, uniform pores, no collapse and cracking.

7. Check the surface pretreatment quality of steel pipe one by one. The surface of pipes shall be free of oil and dust. The derusting quality shall be visually compared with the standard version of "rust grades and derusting grades of steel surface before coating", and shall not be lower than SA2 grade.

8. Check the quality of anti-corrosion coating of steel pipe one by one. The appearance of anticorrosive coating shall be uniform and continuous without leakage. The thickness of anticorrosive coating shall be checked by magnetic thickness gauge to ensure that the thickness is less than the design thickness.

9. The insulation layer shall be free from shrinkage, shrinkage, uneven bubble, core burning and other defects.

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