In 2018, the American Society of Heating, Refrigeration and Air conditioning Engineers (ASHRAE) published a study on Mechanical Piping Joints and this document is a summary of its findings. ASHRAE looked at three types of flame-free mechanical joints that are used in refrigeration and air-conditioning systems, which included; Compression fittings, Press/crimp fittings, and Flare fittings. They also included a brazed joint as a bench mark against the time and leak rate of the various mechanical joints.
