REG NASA-LLIS-0082-1992 Lessons Learned - Dynatube Leak Checks.pdf

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1、Lessons Learned Entry: 0082Lesson Info:a71 Lesson Number: 0082a71 Lesson Date: 1992-05-08a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Dynatube Leak Checks Description of Driving Event: While dynatube leak checks were completed, manifolds were vented to ambient pressure.

2、 This allowed thrusters to leak. After the third flow, engineer positioned ullage valve (V4) to closed, this caused a pressure spike that ruptured the valve burst disk. The engineer was unaware of the failure, which was found during subsequent testing and data review.Lesson(s) Learned: Inadvertent a

3、ctuation of the ullage valve resulted in a valve burst disk failure and oxidizer vapor release.Recommendation(s): Put indications in the operating instructions of exact operation end point, and require safety buy-off to ensure compliance.Evidence of Recurrence Control Effectiveness: N/ADocuments Rel

4、ated to Lesson: N/AMission Directorate(s): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AAdditional Key Phrase(s): a71 Energetic Materials - Explosive/Propellant/Pyrotechnica71 Hardwarea71 Parts Materials & Processesa71 Pressure VesselsAdditional Info: Approval Info: a71 Approval Date: 1994-06-02a71 Approval Name: James G. Klinea71 Approval Organization: KSC/HEIa71 Approval Phone Number: 407-867-7614Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-