This manual provides guidance for designing low pressure compressed air systems with a maximum design operating pressure of 125 psig. including piping, compressors aftercoolers and separators, air receivers, and air dryers. Methods for sizing piping are included. The intention of this manual is to provide criteria to achieve economical, durable, efficient, and dependable compressed air systems to support Army and Air Force facilities. Where special conditions and problems are not covered in this manual, industry standards will be followed. Modifications or additions to existing systems solely for purpose of meeting criteria in this manual are not authorized.