1、Lessons Learned Entry: 0228Lesson Info:a71 Lesson Number: 0228a71 Lesson Date: 1993-06-21a71 Submitting Organization: LERCa71 Submitted by: S. PapellSubject: Vacuum Brazing Furnace Description of Driving Event: A new vacuum furnace was being checked out when it was inadvertently pressurized to much
2、higher than one atmosphere of argon gas. The furnace door was held closed by 3 clamps designed to seal the door “o“ rings while pumping a vacuum. Under pressure the door clamps failed. The door swung open, striking a person who was standing next to it. He was thrown to the floor and sustained a head
3、 injury.Lesson(s) Learned: Vacuum chambers can inadvertently be overpressurized, causing damage to the furnace and injury to personnel.Recommendation(s): Install pressure relief devices on vacuum furnaces to provide automatic venting above 700 torr, even though the furnaces are designed for vacuum s
4、ervice only.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Mission Directorate(s): N/AAdditional Key Phrase(s): a71 Industrial Operationsa71 Pressure Vesselsa71 Safety & Mission AssuranceAdditional 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-,-,-
