Abstract:
This study describes the reasons of failure and corrosion
in pipelines and tanks used in ice-cream factory located in Soltanabad
Industrial Region, Shiraz (Iran). The present research shows that the
chloride level of the water is an important factor in determining the
resistance of stainless steel due to crevice corrosion. Laboratory research
shows that for the majority of natural, raw and potable water with pH
in the range 6.5 to 8; crevice corrosion of 304/304L is rare below about
200 ppm of chlorides. Also crevice corrosion of 316 to 316L with the same
pH is rare below about 1000 ppm of chlorides. Chemical analysis of the
water of industrial region shows that it contains 386.36 ppm chlorides.
So, the stainless steel pipeline type 304, which is used in the factory
did not have any resistance against the crevice corrosion and rapidly
corroded from those points which were more susceptible such as welded
zone. Since the pipes were corroded around the welded zones, metallographic
studies were conducted in this area which revealed that the welds were
not of high quality and contained holes in the welded zones as well as
imperfections such as lack of diffusion and incomplete penetration. Finally
preventing methods of pipelines corrosion is discussed.
R. Bazargan-Lari and Y. Bazargan-Lari, 2009. Investigation of Failure and Corrosion in Pipelines and Tanks used
in Ice-Cream Factory: The Case Study. Trends in Applied Sciences Research, 4: 56-61.
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