1、Lessons Learned Entry: 0044Lesson Info:a71 Lesson Number: 0044a71 Lesson Date: 1991-12-06a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: Electrical and Mechanical Equipment; Overhead Pipe Supports; Emergency Procedures for Critical Utility Systems; Utility Annex Emergency
2、Power Shut Off Capability Description of Driving Event: A painter in the utility annex stepped on a pipe, causing it to fracture at the interface of an attached valve. The pipe remained attached to the valve, but the leak sprayed water onto the motor control center located beneath the pipe, causing
3、a short circuit in the switch gear and a subsequent power outage for several facilities. This power outage resulted in the suspension of test operations that were being performed on the hubble space telescope.Lesson(s) Learned: 1. Utility annex water lines routed above unprotected high voltage elect
4、rical equipment may rupture causing power outages and equipment failures.2. Pipes with less than adequate support will rupture or bend excessively when external forces are applied.3. Operations and maintenance instructions for critical utility systems must identify potential emergency conditions and
5、 provide emergency procedures.4. When there is no capability of shutting off utility annex power in an emergency, damaged equipment continues to operate without stability.Recommendation(s): 1. Provide splash guards or water resistant barriers for electrical and mechanical equipment subject to possib
6、le water damage.2. Place pipe supports within one foot of each change of direction and space the remaining supports to prevent excessive sag, bending and shear stress.3. Update OMIs for utility annexes and critical facilities, identifying emergency conditions and Provided by IHSNot for ResaleNo repr
7、oduction or networking permitted without license from IHS-,-,-providing appropriate emergency procedures.4. Install local power disconnects at utility annexes for safing power during emergency situations.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directo
8、rate(s): N/AAdditional Key Phrase(s): a71 Emergency Preparednessa71 Facilitiesa71 Hardwarea71 Industrial OperationsAdditional Info: Approval Info: a71 Approval Date: 1994-06-01a71 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-,-,-
