Videos

Corrosion Behavior of Sub-Grade Mechanical Fasteners Most mechanical fasteners contain multiple alloys and each metal alloy corrodes at a different rate causing a loss of structural integrity. Laboratory evaluation of each fastener allows an understanding of the impact of different stresses but also how that fastener will fail in service. Utilities may then use this knowledge for fastener selection but also to determine inspection cycles for the substation grounds.

Cathodic Protection and the Effects of Stray Current In many cases the voltage level of stray currents that are found within the ROW fall below the safety criteria for touch and step potentials, so it is ignored and the effects are not well understood. This can be a fatal flaw in the asset management processes and discharge current may severely reduce the service life of a structure. This video demonstrates the concepts of anodic and cathodic interference and how we may identify each source to mitigate the stray current interference.