1、Lessons Learned Entry: 0993Lesson Info:a71 Lesson Number: 0993a71 Lesson Date: 2001-01-01a71 Submitting Organization: MSFCa71 Submitted by: Charles ChesserSubject: Pressure Testing Description of Driving Event: A valve was damaged by being exposed to excess pressure during testing because it was in
2、the wrong configuration. The valve was in the closed position when warnings and procedures stated to only test in the open position.Lesson(s) Learned: Warnings and procedural notes do not reliably protect hardware from excessive pressure during test.Recommendation(s): Use fail safe methods, such as
3、re-configuring the test setup, to safeguard hardware under test pressure in lieu of warnings.Evidence of Recurrence Control Effectiveness: No evidence is available, since no further valve testing was done due to Project termination, but the revised procedure should have kept the valve from accepting
4、 pressure in the closed configuration.Documents Related 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 Hardwarea71 Pressure Vesselsa71 Test Articlea71 Test Facilitya71 Test & VerificationAdditional Info: Approval Info: a71 Approval Date: 2001-10-23a71 Approval Name: Lisa Hedigera71 Approval Organization: QSa71 Approval Phone Number: 256-544-2544Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
