Abstract
The article describes methods and tools for inspection of thickness and hardness of coatings of elements of ball shut-off valves (ball plugs), which are one of the main elements of main pipelines and distribution networks. Properties of nickel-phosphorus (ENP) coatings most frequently used to protect ball plugs from corrosion and abrasion are analyzed. Various methods and means of control are considered. In the process of experimental studies, the thickness of coatings was measured by magnetic induction and eddy current methods of nondestructive control, as well as by ball abrasion method. Hardness values were measured by microvickers and ultrasonic contact impedance methods. The main sources of measurement errors were identified. Conclusions are drawn for each of the methods used in the incoming inspection of coatings.
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