REG NASA-LLIS-0242-1993 Lessons Learned - Hydrogen Vent Stacks.pdf
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REG NASA-LLIS-0242-1993 Lessons Learned - Hydrogen Vent Stacks.pdf
1、Lessons Learned Entry: 0242Lesson Info:a71 Lesson Number: 0242a71 Lesson Date: 1993-07-16a71 Submitting Organization: LERCa71 Submitted by: S. PapellSubject: Hydrogen Vent Stacks Description of Driving Event: N/ALesson(s) Learned: Weather caps installed on the discharge end of hydrogen vent stacks c
2、an generate static electric charges to ignite the hydrogen gas and start unwanted stack fires.Recommendation(s): Replace weather caps with thrust balanced vent outlets 180 degrees opposed. Toroidal rings should be installed at vent outlets to minimize sharp edges. A helium purge in the stack base wi
3、ll provide a means to extinguish stack fires if propagated.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Additional Key Phrase(s): a71 Energ
4、etic Materials - Explosive/Propellant/Pyrotechnica71 Fire ProtectionAdditional Info: Approval Info: a71 Approval Date: 1994-06-15a71 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-,-,-
