This article analyzes the metrological support of tightness control technologies, taking into account safety rules at hazardous production facilities. Scientific and methodological aspects of assessing the threshold sensitivity of tightness control systems using control leaks containing standard samples of reproduction of units volumetric and mass flow rates of gas, which expands the scope of their applicability.

Key words: non-destructive testing, tightness control, control leaks, threshold sensitivity of control systems, standard samples of reproduction of units of volumetric and mass flow rates of gas, critical micronozzle.