1、Lessons Learned Entry: 0232Lesson Info:a71 Lesson Number: 0232a71 Lesson Date: 1993-06-25a71 Submitting Organization: LERCa71 Submitted by: S. PapellSubject: Exhaust Gas Cooler Description of Driving Event: A deactivated exhaust gas cooler in a vacuum line collapsed under normal operating conditions
2、 of 26 inches of mercury. The cooler was destroyed. There was minor damage to a nearby wall due to negative pressure in the vicinity of the cooler. Skylights in the shop area imploded and a considerable amount of debris was drawn into the piping.The principal cause of the failure was deterioration o
3、f the cooler due to age. Poor welding during assembly and inadequate inspection of the cooler were contributing factors.Lesson(s) Learned: Aging test facility equipment such as deactivated gas coolers that are being used as part of vacuum lines are subject to catastrophic structural failure.Recommen
4、dation(s): Inspect piping and components of aging vacuum systems at regular intervals to assure reliability using Zyglo, X-Ray and Ultrasonic techniques.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: Provided by IHSNot for ResaleNo reproduction or networking permitted
5、without license from IHS-,-,-N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Ground Equipmenta71 Hardwarea71 Industrial OperationsAdditional Info: Approval Info: a71 Approval Date: 1994-04-19a71 Approval Name: Maria Havenhilla71 Approval Organization: LERC/EBASa71 Approval Phone Number: 216-977-1483Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
