Compressed Air Best Practices, June 2014, by Joe Ghislain.
http://www.airbestpractices.com/standards/food-grade-air/asme-ea-4-2010-energy-assessment-compressed-air-systems-what-s-it-all-about

"The ASME EA-4 standard takes the same system approach that is taught in the Compressed Air Challenge® Fundamentals and Advanced Compressed Air System Management courses and provides a prescriptive but scalable process that can be tailored to each facility. Along with system definition, it sets requirements for organizing and conducting the assessment, analyzing the data, and reporting and documenting of the findings."