![]() There are some off shoots of longer 3/4dia lines feeding other lines, basically I estimated total storage volume by multiplying lineal footage by cross section area of each diameter. Out of the 2" piping runs 3/4" short runs of 40ft or less ending with 3/8dia, 10ft long whip hoses. ![]() From here it is necked down to five 2"dia lines about 240ft each. 2" diameter main line goes from compressor to air dryer then out with 2"dia into a 3" main distribution line(about 72 ft long). There are two 100 hp compressors, only one runs at any given time. RE: Air loss calculation dkhayes117 (Electrical) What happens after 1.55 minutes (I minute 55 seconds or 1 minute and 32 seconds? Does pressure keep falling?Īlso: If you get a response it's polite to respond to it. Your system is very small bore and very long and hence the average pressure in the piping isn't 114 psig but something much lower. There is a pressure regulating valve somewhere in the system Your volume is incorrect ( by factor of 10) Then either there is a lot of gas now going somewhere else ( back through the compressor?) or If yes then when you stop the compressor in 1.55 minutes the pressure falls from 114 psig to 84 psig? So does your compressor normally maintain the pressure at 114 psi no problem? You don't describe your system very well, but on the assumption that there is a compressor, a non return valve, quite a lot of piping ( can you describe how you got to 6000 cubic feet please) and presumably some sort of usage. There must be a difference between the compressor's cfm rating and the cfm I'm calculating? RE: Air loss calculation BigInch (Petroleum) 17 Jan 17 20:06 Leakage rate = (volume x (Pressure intial - Pressure final))/14.7 x time How much CFM is being lost?ġ14psi/14.7psi = 7.755 atmospheres x 6000 cubic feet = 46530 cubic feetĨ4psi/14.7psi = 5.714 atmospheres x 6000 cubic feet = 34284 cubic feetĤ6530-34284 = 12246 cubic feet difference/1.55 minutes = 7900CFM which cannot be right, what am I missing? The pressure drops from 114 psi to 84 psi in 1.55 minutes with compressor off. ![]() The compressor is tankless, the only storage is the piping, which comes out to about 6000 cubic feet volume. The compressor runs at approximately 114psi. We have an Ingersoll rand r75n screw compressor rated at a maximum of 457 CFM, 75kw/100hp. Hi all, I'm trying to determine CFM loss from change in PSI and known storage. ![]()
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