The level of electrical-chemical protection of pipelines and industrial areas; The efficiency of cathodic protection systems; Operating modes of cathodic protection systems to ensure complete electrical-chemical protection of facilities; Wall thickness of pipelines using ultrasonic wave devices; Thickness of protective layers on pipelines and locations of any defects present. Energy audit - conducting an energy inspection and expertise for fuel and energy resource consumers. Assessing working conditions and certifying workplaces according to labor conditions. Regularly conducting non-destructive tests at various stages of the technological process and statistically processing the results of these tests to identify the stages of the technological process where defects occur, studying the causes of the respective defects, and providing recommendations for their elimination.