1、 Public Lessons Learned Entry: 3296Lesson Info:a71 Lesson Number: 3296 a71 Lesson Date: 2010-06-10 a71 Submitting Organization: KSC a71 Submitted by: Annette Pitt Subject: Verify Sound Suppression Piping Is Pre-Filled To Lowest Nozzles Prior To Tank Fill Abstract: For the Space Shuttle Program, a So
2、und Suppression Water System was installed on the launch pads to protect the orbiter and its payloads from damage by acoustical energy and rocket exhaust reflected from the flame trench and Mobile Launcher Platform during launch. Filling the Sound Suppression Water Systems tank and riser, and prefil
3、ling its lines, can normally be done in less than 2 hours (not including time for relocation of technicians). However, if the piping were completely drained (e.g., for a valve inspection or inspection of the internal piping), filling the lines, tank, and riser would take about 8 hours. A launch can
4、be delayed if the schedule does not account for this extra time for filling. Description of Driving Event: During processing for a Shuttle launch in 2007, the Sound Suppression water piping was not prefilled before the launch countdown began. (The piping had been drained for an inspection.) Filling
5、the tank and riser took approximately 8 hours. This led to a delay in the launch schedule, because the technicians required extra time to do the filling. Lesson(s) Learned: To avoid launch delays, the water lines in the Sound Suppression Water System should be prefilled before the start of the count
6、down. Figure 1: Engineers observe water being pumped on the launch pad through the Sound Suppression System Figure 2: Sound Suppression Water System Schematic Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Figure 3: Water lines and 48“ Valves Recomm
7、endation(s): Add steps to the procedures for launch processing to verify the water lines in the Sound Suppression Water System are prefilled before the start of a launch countdown. Evidence of Recurrence Control Effectiveness: N/A Documents Related to Lesson: N/A Mission Directorate(s): a71 Space Op
8、erations a71 Exploration Systems Additional Key Phrase(s): a71 1.Launch support systems a71 1.Maintenance a71 1.Ground support systems Additional Info: a71 Project: Space Shuttle Program Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Approval Info: a71 Approval Date: 2010-12-02 a71 Approval Name: mbell a71 Approval Organization: HQ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
