1、Lessons Learned Entry: 0250Lesson Info:a71 Lesson Number: 0250a71 Lesson Date: 1993-10-07a71 Submitting Organization: LERCa71 Submitted by: S. PapellSubject: Pressure Testing of Piping Systems Description of Driving Event: A section of a piping system was removed from a test facility for outside pre
2、ssure testing. The pipe section had an expansion bellows mounted on the end that was not restrained and under nitrogen gas pressure the bellows ruptured injuring several employees. Although the pressure in the system was under the design maximum, it was determined that the primary cause of the accid
3、ent was failure of the bellows. While properly designed for its application, it was not tested under conditions for which it was designed.Lesson(s) Learned: Piping systems with expansion joints can fail at less than their rated pressure if not adequately supported during pressure testing.Recommendat
4、ion(s): Assemble piping systems containing expansion joints for testing with both ends of the joints restrained before pressurizing.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without license fr
5、om IHS-,-,-Mission Directorate(s): N/AAdditional Key Phrase(s): a71 Pressure Vesselsa71 Test & VerificationAdditional Info: Approval Info: a71 Approval Date: 1993-10-19a71 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-,-,-
