REG NASA-LLIS-0121-1992 Lessons Learned - Orbiter Vehicle (OV) Hydrogen (H2) Tank Removal.pdf

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1、Lessons Learned Entry: 0121Lesson Info:a71 Lesson Number: 0121a71 Lesson Date: 1992-08-18a71 Submitting Organization: KSCa71 Submitted by: Lisa L. MusgraveSubject: Orbiter Vehicle (OV) Hydrogen (H2) Tank Removal Description of Driving Event: During removal of the H2 tank from the OV-104 mid-body, a

2、crane was used to take up the initial cable slack and transfer the load from the tank struts to the GSE lifting fixture. The move director called for a crane movement of “up at 1 in/sec“ and the crane controller relayed the command to the crane operator. The actual lift rate was on the order of “up

3、at 3 in/sec“ and a momentary vertical load of 800 lbs was applied to the tank assembly. This load was immediately reduced and the tank bolts removed. The normal transfer load is made up of a 150 lb tank lifting fixture and a 235 lb tank weight.Lesson(s) Learned: Cranes used to remove slack and trans

4、fer loads from tank struts to a ground support equipment lifting fixture may cause a momentary vertical overload.Recommendation(s): Update OMI procedure to utilize hydraset units (in place of cranes) during transferring of loads to avoid overloading tank assemblies.Evidence of Recurrence Control Eff

5、ectiveness: N/ADocuments Related to Lesson: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Industrial Operationsa71 Lifting Devicesa71 TransportationAdditional Info: Approval Info: a71 Approval Date: 1994-06-02a71 Approval Name: James G. Klinea71 Approval Organization: KSC/HEIa71 Approval Phone Number: 407-867-7614Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-