1、Lessons Learned Entry: 0264Lesson Info:a71 Lesson Number: 0264a71 Lesson Date: 1993-06-30a71 Submitting Organization: JSCa71 Submitted by: S. MartinSubject: Control of Operations Involving Adjustment, Modification, or Maintenance of Fluid or Pressurized Systems (Such as Wet Pipe Fire Suppression Sys
2、tems) Description of Driving Event: Construction personnel were performing renovations to room 194 in building 16A at JSC. The renovation project included installing a suspended ceiling in part of the room. While in process of installing the ceiling, a pipefitter for the facility construction contra
3、ctor noticed that the fire suppression system sprinkler head fusible link guard on one head was not consistent with the other heads in the room. Since the sprinkler would not operate effectively with this misalignment, the pipefitter tried to correct the problem. As he was attempting to adjust the m
4、isaligned guard, the wrench slipped breaking the fusible link on the sprinkler head causing water to be discharged into the room. Although the water pressure was immediately shut off, the broken head continued to drain water for approximately 30 minutes.Lesson(s) Learned: Unauthorized modifications
5、to a wet pipe fire suppression system without depressurization and safing caused damage to the system which led to a discharge of fluid and a close call for equipment damage.Recommendation(s): Contractor procedures were changed to specify that modifications or adjustments to pressurized systems are
6、not to be accomplished until the system is secured and depressurized. This procedure was disseminated to all personnel.Evidence of Recurrence Control Effectiveness: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/ADocuments Related to Lesson: N/AMi
7、ssion Directorate(s): N/AAdditional Key Phrase(s): a71 Logisticsa71 Policy & PlanningAdditional Info: Approval Info: a71 Approval Date: 1993-09-13a71 Approval Name: Ron Montaguea71 Approval Organization: JSC/NS3a71 Approval Phone Number: 281-483-8576Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
