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Comment Operations & Maintenance

A probe that tests galvanizing kettles at high temperatures

By Gerald Ondrey |

To provide corrosion protection and long life, steel products are galvanized by immersion into kettles containing molten zinc. These galvanizing kettles need to be checked periodically to monitor rates of corrosion in order to avoid a catastrophic spillage of molten Zn. Previous monitoring techniques either used an external probe, or else the galvanizers had to drain the zinc from the kettles, which were then cooled sufficiently to enable physical sampling of the kettle surface. Such methods are time consuming and costly. Now, a quicker, direct method for inspecting kettles has been developed at Sonemat Ltd. (Albridge, Walsall, U.K.; www.sonemat.com) from research at the University of Warwick (U.K.; www2.warwick.ac.uk), and is being commercialized by Zinco UK Ltd. (Hereford; www.zincouk.com) in its new Zinc Immersion Probe (ZIP) technology, which can perform safety critical testing while submerged in molten Zn. All the internal components of the ultrasonic transducer inside the sensor are designed to survive temperatures of 450°C without any cooling, explains professor Steve Dixon, director of the Center for Industrial Ultrasonics at the University of Warwick (www.ciu.ac.uk). Ultrasound travels from the sensor head into the liquid…
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