1、Lessons Learned Entry: 0130Lesson Info:a71 Lesson Number: 0130a71 Lesson Date: 1992-09-24a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Fuel Cell Coolant Loop Vacuum Pump Description of Driving Event: The units contain a vacuum pump driven by 1/2 HP electric motor, a shut
2、off valve, a vacuum break valve and an oil trap tank. The -1 and -2 units consist of GFE previously used on the apollo program and modified by the addition of quick disconnect couplings, a vacuum read-out gage, and fluid hoses. Also, replacement of components not compatible with the fuel cell coolan
3、t FC-40 and electrical system modifications have been made to meet shuttle program use requirements. The pump has provision for oil separation; however, if the systems volume is sufficiently large, oil vapor may be sucked from the pump into the system.Lesson(s) Learned: The check valve in the inlet
4、line of this vacuum pump has been unable to prevent reverse flow of air through the pump and into the system.Recommendation(s): Install an upstream solenoid valve to automatically disconnect the system if power is lost.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/A
5、Provided by IHSNot for Resale-,-,-Mission Directorate(s): a71 Space Operationsa71 Exploration SystemsAdditional Key Phrase(s): a71 Ground Equipmenta71 HardwareAdditional Info: Approval Info: a71 Approval Date: 1994-06-03a71 Approval Name: James G. Klinea71 Approval Organization: KSC/HEIa71 Approval Phone Number: 407-867-7614Provided by IHSNot for Resale-,-,-
