How much CFM is required to move cement from a 1500 silo through 4 delivery hoses? What pressure is required?
You need to know more about the system arrangement, such as length of the hose array, pressure drop through the hose and other piping, change in elevation, specific gravity of the cement, etc.. The CFM achieved is a result of the pressure in the system. For a given system a specific CFM will result from a given pressure.
