domestic factory offer the tube section or structure plates after galvanized, the average thickness of the zinc coating is 84µm, if no saline-alkali water or other industry waste water dip in long time, the galvanization can anti-corrosion, the service life can be 60-80 years.
according to the survey, the steel pipe without galvanization, the corrosion thickness is 0.01
0.03mm per year,as far, the factories in China, offer the pipe 0.5mm more thickness wall, it can increase 25-50 years service life, otherwise, the when the pipe arrive to the construction site, it will coat asphalt twice, the asphalt coating will be 0.4-0.5mm thickness, the service life can increase 5*15 years. according to the live load situation at home, factories adjust the parameters of the culvert pipe(corrugation pitch, corrugation depth, wall thickness), make sure the pipe with a longer service life.
so, in China, the corrugated pipe service life can be 100 years no problem. in 2008, there are more than 300 sets corrugated culvert in use, and via the testing durability caculation, most of the structures service life can be more than 60 years.
