REG NASA-LLIS-0537-1996 Lessons Learned - O-Ring Manufacture for Vacuum Sealing.pdf

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1、Lessons Learned Entry: 0537Lesson Info:a71 Lesson Number: 0537a71 Lesson Date: 1996-05-01a71 Submitting Organization: LARCa71 Submitted by: Ruth M. AmundsenSubject: O-Ring Manufacture for Vacuum Sealing Description of Driving Event: O-ring manufactured on MIDAS for vacuum seal was made with butt joi

2、nt instead of 45 angle joint.Lesson(s) Learned: The best O-ring seal is attained with a commercial O-ring or one with a 45 angle joint. Do not assume that a fabrication shop will put a 45 joint in automatically - they may have no way of knowing that you are going to use it for vacuum use.Recommendat

3、ion(s): For O-rings that must make a good vacuum seal, buy them commercially or make sure the person making them is going to put a good 45 angle on the joint - butt joints will leak.Evidence of Recurrence Control Effectiveness: Commercial O-rings gave a much better seal than ones fabricated with but

4、t joint.Documents Related to Lesson: N/AMission Directorate(s): N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Additional Key Phrase(s): a71 Parts Materials & ProcessesAdditional Info: Approval Info: a71 Approval Date: 1997-05-03a71 Approval Name: Elijah C. Kenta71 Approval Organization: 421a71 Approval Phone Number: 757-864-3345Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-