REG NASA-LLIS-0247-1993 Lessons Learned - Hydrogen Detectors.pdf
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1、Lessons Learned Entry: 0247Lesson Info:a71 Lesson Number: 0247a71 Lesson Date: 1993-08-09a71 Submitting Organization: LERCa71 Submitted by: S. PapellSubject: Hydrogen Detectors Description of Driving Event: During the filling of a liquid hydrogen test apparatus mounted in an AJ-2 airplane low-g test
2、 facility, an explosion occurred followed by a fire. The cause of the mishap was determined to be a leak due to a loose “AN“ fitting on a 1/2 inch vent line that was teed to the fill line of the research package. The ignition source was found to be hydrogen detectors mounted in the airplane near the
3、 test rig for safety considerations.Proof of the ignition source was determined by bench testing the detectors. The test consisted of flowing mixtures of hydrogen and air through them to determine if the flame fronts generated by the catalyst would be stopped by the flame arrestors. At a hydrogen vo
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