REG NASA-LLIS-0219-1993 Lessons Learned - High Pressure Steam Line Valves.pdf

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1、Lessons Learned Entry: 0219Lesson Info:a71 Lesson Number: 0219a71 Lesson Date: 1993-06-18a71 Submitting Organization: LERCa71 Submitted by: S. PapellSubject: High Pressure Steam Line Valves Description of Driving Event: A high pressure steam valve ruptured in the basement of the building, releasing

2、steam that damaged walls and floor tiles. The mishap was caused by dynamic loading to the line resulting from severe water hammer. Heavy rainfall preceeding the incident flooded the steam trench. The steam line enclosed with cool water set up a heat exchange process forming excessive condensate that

3、 was put into motion by the building demand. Slugs of water generated dynamic loads in the piping. The cast iron steam valve (Chapman gate valve model 59 1/2) then ruptured.Lesson(s) Learned: High pressure steam valves made of gray iron can rupture when exposed to severe water hammer.Recommendation(

4、s): Replace all ferrous high pressure steam valves not positively identified as cast steel, bronze, brass, stainless steel, or ductile iron.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without li

5、cense from IHS-,-,-Mission Directorate(s): N/AAdditional Key Phrase(s): a71 Facilitiesa71 Parts Materials & Processesa71 Pressure VesselsAdditional 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-,-,-