Increasing energy efficiency and energy savings has become an important topic for industries as they explore ways to minimize their energy consumption. Compressed air is utilized throughout numerous industries and its uses can range from moving objects/materials, supplying air to multiple compressed air tools, to operating machinery and the creation process of products. Depending on the size of the compressed air system there can be many different places where compressed air leaks can take place, which can cause the industry to lose pressure and energy to replace the lost compressed air. One of the existing challenges in manufacturing industries is the lack of accurate method to quantify the high-pressure air leaks in their systems even when an ultrasound sensor is used. In this paper, a method is investigated and experimented to investigate a reasonable correlation between the decibel reading from the ultrasound sensor and the flowrate of the high-pressure air leak through an orifice. Correlations developed from this study are function of pressure of air flow, orifice size and distance of leak from equipment, among other parameters. Such correlations can be utilized to accurately quantify the flowrate of compressed air through an orifice over time. The outcomes of this study could help energy engineers to have an analytical tool to quantify the potential energy saving opportunities in compressed air systems in manufacturing plants, hence reduce the energy, cost and carbon dioxide emission, more confidently.