1、Lessons Learned Entry: 0251Lesson Info:a71 Lesson Number: 0251a71 Lesson Date: 1993-08-11a71 Submitting Organization: LERCa71 Submitted by: S. PapellSubject: Liquid Oxygen Spills Description of Driving Event: Prior to running a test in a facility using liquid oxygen, a check was made on the sequence
2、 timer which controls the valving of the system. When the console selector switch was set at “CHECK“ and the check started, the liquid oxygen fire valve opened and spilled liquid oxygen. Pressure in the supply tank is required during standby to keep air and water vapor out of the system.Lesson(s) Le
3、arned: When checking sequence timers that control liquid oxygen valving, it is possible to cause oxygen spills if pressure exists in supply tank.Recommendation(s): Design circuitry on the electrical check system to include control of fire valves so that electrical checks can be made without valve op
4、eration.Evidence of Recurrence Control Effectiveness: 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/Pyrotechnica7
5、1 Hazardous/Toxic Waste/MaterialsAdditional 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-,-,-
