The collapse of wine tanks at Darling Cellars in 2021 made industry news, and when forensic metallurgists were called in to analyse what had happened, they found that poor manufacturing had caused the failure, resulting in massive losses for the wine business.
It’s not an isolated incident. Namaqua Wines has suffered similarly. The team that helped these companies find solutions was led by materials engineer Dr Janet Cotton of leading local forensic metallurgy company One Eighty Degrees.
The need for metallurgical forensic analysis in the food and beverage industry is clear. It’s important to know why things broke to prevent them from failing in the future. ‘Failures happen in the materials of construction,’ Dr Cotton explains, ‘so you need to be able to look at the failure, at the fractured surface or the failed area, to give you the clues as to why the failure occurred. You need to know why and how materials behave under stress.’
To uncover ‘whodunnit’, various metallurgical and materials engineering analysis tools are employed, including high-tech analysis tools such as scanning electron microscopy, mechanical testing, tensile testing, impact testing and hardness testing. And part of the training as a materials engineer is learning how to use these techniques, and how to interpret the results. ‘Some of the very advanced investigative tools are Fourier Transform, infrared spectroscopy, X-ray diffraction and atomic force microscopy,’ Dr Cotton explains. ‘I could go on and get very excited about the number of fantastic diagnostic tools available to us, but the thing about being a qualified materials engineer is that you need to understand how these methods work. You need to know how to interpret the information, and if you can’t do that correctly, you can make a horrifically poor judgement as to what you’re seeing and interpreting from the results and data.’
In her career, Dr Cotton is most proud of having applied some of these techniques to solving for South African Breweries’ stress-cracked hot water line in Newlands back in 2002. Her recommendations are still going strong today, having robustly outlasted their anticipated 20-year lifespan.
