Pressure Vessel Failure During Hydrotest
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Pressure Vessel Failure during Hydro Test
Nanjing Yuchuang Co, China
28thNovember 2007
Please find attached a couple of photos of a pressure vessel that recentlyfailed whilst under hydrotest during post fabrication testing. This vessel wasmanufactured by Nanjing Yuchuang Co. in China and the plate was of
Chinese mill origin. Unfortunately this is another example of seriousequipment/material failures with equipment being sourced out of the rapidlydeveloping economies such as China, Eastern Bloc and others. Theseexamples are becoming almost a weekly occurrence now and are exhibitingfailure modes not seen in the mature manufacturing economies since the1930's. Again we need to ensure vigilance in the acceptance of manufacturersand once more I stress the need to know where the base materials aresourced from.
Apparently this pressure vessel had reached fifty percent of the required testpressure when the shell ruptured. A metallurgical failure report is not availablehowever from the photographs a number of observations could be maderegarding the quality of the material and the welding. If you check out thewelding (undercut/poor visual/arc strikes) it is unlikely that this vessel wouldhave be conforming to any Pressure Vessel code, let alone be ready for a
hydro.
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