REG NASA-LLIS-0248-1993 Lessons Learned - Cleaning Fluids.pdf

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1、Lessons Learned Entry: 0248Lesson Info:a71 Lesson Number: 0248a71 Lesson Date: 1993-08-06a71 Submitting Organization: LERCa71 Submitted by: S. PapellSubject: Cleaning Fluids Description of Driving Event: An explosion occurred during the cleaning operation of a tank containing nitrogen tetroxide and

2、residual hydrazine. The cleaning fluid used was trichloroethylene, considered to be inert and compatible with the chemicals involved. The intensity of the explosion killed two workmen. Bench tests were run with conflicting results and further tests were planned.Lesson(s) Learned: Cleaning tanks cont

3、aining residual nitrogen tetroxide and hydrazine with inert trichloroethylene can cause explosions.Recommendation(s): Analyze the contents of the tanks to be cleaned, including the cleaning fluid to be used, to determine chemical stability of the mixture.Evidence of Recurrence Control Effectiveness:

4、 N/ADocuments Related to Lesson: N/AMission Directorate(s): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AAdditional Key Phrase(s): a71 Energetic Materials - Explosive/Propellant/Pyrotechnica71 Safety & Mission AssuranceAdditional Info: Approval Info: a71 Approval Date: 1993-09-16a71 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-,-,-