REG NASA-LLIS-2976-2010 Lessons Learned - Ground Pneumatics Leak Detection System.pdf
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1、Public Lessons Learned Entry: 2976Lesson Info:a71 Lesson Number: 2976 a71 Lesson Date: 2010-04-20 a71 Submitting Organization: KSC a71 Submitted by: Annette Pitt Subject: Ground Pneumatics Leak Detection System Abstract: Due to the high-volume storage of gases at KSC, gas leaks have often gone undet
2、ected for long periods. This resulted in significant costs, especially when there have been leaks in the gaseous helium (GHe) system. To detect a leak suspected in a large interconnected system such as the GHe system, subsystems must be incrementally isolated to narrow the leak down to a particular
3、area for more focused, detailed inspections. This entails significant time and effort and, because outages in real time are required, also adds to the processing time. New designs or upgrades to the KSC pneumatic systems should incorporate a strategy for detection and quick isolation of gas leakages
4、. Description of Driving Event: At approximately 0200 on January 11, 2010, a GHe relief valve in Orbiter Processing Facility (OPF) High Bay 3 relieved due to a failed regulator in the Forward Reaction Control System (FRCS) monomethylhydrazine (MMH) ground servicing panel. GHe vented to the atmospher
5、e for approximately 13 hours before the leak was found and isolated. The cost of the GHe loss alone was approximately $50,000. Lesson(s) Learned: The event described above is only one recent example of several GHe leak events that have occurred over the duration of the Shuttle program. Some of the k
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