1、Lessons Learned Entry: 0233Lesson Info:a71 Lesson Number: 0233a71 Lesson Date: 1994-05-27a71 Submitting Organization: LERCa71 Submitted by: S. PapellSubject: Exhaust Systems - Gas Cooler Collapse Description of Driving Event: A deactivated exhaust gas cooler in a vacuum line collapsed under normal o
2、perating conditions 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
3、was deterioration of the cooler due to age. Poor welding during assembly and inadequate inspection of the cooler were contributing factors.Lesson(s) Learned: Large capacity exhaust systems in test facilities are potentially as hazardous as pressure systems. Failure of components due to age deteriora
4、tion can occur if inspected improperly.Recommendation(s): Perform routine inspections of the system, especially of components which have been in use for a considerable time. Warn personnel to stay out of areas that include high capacity vacuum lines when exhausters are operating.Evidence of Recurren
5、ce Control Effectiveness: N/ADocuments Related to Lesson: Provided by IHSNot for ResaleNo reproduction or networking permitted 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: 1994-06-08a71 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-,-,-
