What is the difference between SCFM, ACFM and ICFM?
In specifying blower performance, major problems often occur in distinguishing ACFM from SCFM, and in correctly converting from one to the other. Some people even use SCFM and ACFM interchangeably. SCFM is normally used to designate flow in terms of some base or reference pressure, temperature and relative humidity. Many standards are used, the most common being the Compressed Air & Gas Institute (CAGI) and the American Society of Mechanical Engineers (ASME) standards, which are 14.7 PSIA, 68° F and 36% RH. This converts to a density of 0.075 lbs/cu.ft. for air. SCFM is usually established from a weight flow corresponding to some system requirement for oxygen. Therefore, if actual site conditions are different from the standard or reference conditions, corrections must be made to reflect the actual (not standard) conditions existing at the inlet and outlet connections of the blower. These corrections must, therefore, be made to assure that the blower furnished will provide the proper a
