IMPROVED LEAK DETECTION, CORRELATION OF ACTUAL LEAKAGE WITH INSTRUMENT INDICATIONS, EFFECTS OF HUMIDITY ON LEAKS AND CATEGORIZATION OF LEAK INFORMATION

摘要

The following reports on "Propellant Ullage Decay" (ME #495), and "Use ofna Flow Conversion Nomograph for Leaks and Capillaries" (ME #484) are submittednas Progress Report #2 to DSR 10441.nThe primary purpose of the ullage decay study was to determine a relationship between the helium leak rates and the actual ullage gas leak rates. The results of this study showed that the propellant gases flow at a rate equal to, or slower than, helium. In many instances the escaping ullage gas (particularly in the case of nitrogen tetroxide) actually condensed in the leak path and eliminated any further gas leakage.nThe Nomograph (ME #484) is submitted for information on flow rate conversions. By use of the Nomograph the flow rate of any gas, through any given path, can be converted to the flow rate of any liquid at any pressure through the same path. The monograph was developed-theoretically; however, the gas portion has been proven experimentally.