Polyurethane Piping Acceptance Criteria

1, Field inspection: polyurethane insulation and waterproof materials with twofold performance, after the material into the field, the raw materials must be retested, spray polyurethane retest content is mainly for the density of the material, compression properties, dimensional stability, impermeability and so on.

2, Waterproof performance check: using water or rain to check its waterproof effect, there shall be no water and water seepage phenomenon.

3, Spraying thickness check: the use of steel needle insertion and measurement methods to check the thickness.

4、Surface flatness check: using 1m ruler and wedge-shaped ruler for measurement, allowable deviation of 5mm.

5, Rigid foam polyurethane should be firmly bonded with the grass-roots level, the surface shall not have damage, delamination, bulging, holes and cracks.

6, Polyurethane insulation pipe insulation layer of any position of the foam density should not be less than 60kg/m3. foam surface is smooth, not sticky, not shrinkage, bubble hole uniformity, no collapse, cracking.

7, the quality of the steel pipe surface pretreatment root by root inspection, steel pipe surface should be free of oil, dust, rust removal quality with the "pre-painting steel surface corrosion grade and rust removal grade" in the standard version of the visual comparison, it should not be less than sa2 level.

8, The quality of steel pipe anticorrosion layer root by root inspection, the appearance of the anticorrosion layer should be uniform and continuous, no leakage of paint, the thickness of the anticorrosion layer should be magnetic thickness gauge for quality check, the thickness shall not be less than the design thickness.