The purpose of API 578 recommended practice is to provide the guidelines for a material and quality assurance system to verify that the nominal composition of alloy components within the pressure envelope of a piping system is consistent with the selected or specified construction materials to minimize the potential for catastrophic release of toxic or hazardous liquids or vapors.Analytical Training Consultants (ATC) is a consultant company specializing in providing the Oil and Gas Petrochemical and Refining industry with recognized, standardized, and recommended practices for proper training and refresher courses.