REG NASA-LLIS-0138-1992 Lessons Learned - GOX Vent Arm Air Receivers Bleed Manifold Venting Operations.pdf

1、Lessons Learned Entry: 0138Lesson Info:a71 Lesson Number: 0138a71 Lesson Date: 1992-09-25a71 Submitting Organization: KSCa71 Submitted by: Lisa L. MusgraveSubject: GOX Vent Arm Air Receivers Bleed Manifold Venting Operations Description of Driving Event: During bleed down of the 125 psi air system,

2、a process which lasts less than one minute, the noise level at the Pad B gaseous oxygen (GOX) vent arm air receiver outlet vent exceeds permissible OSHA noise exposure limits. A noise hazard survey conducted during the bleed down operation was performed on the air system to determine the noise level

3、 near the operators ear. This survey recorded a noise level of 126.5 DBA. OSHA 1910.95, occupational noise exposure, limits noise exposure for fifteen minutes or less to 115 DBA. A possibility exists for personnel permanent hearing loss.Lesson(s) Learned: Excessive noise levels during GOX vent arm a

4、ir receivers bleed manifold venting operations may damage personnel hearing.Recommendation(s): Install muffler on outlet vent to operate both air receivers during bleed operations and reduce noise level to within OSHA regulations.Evidence of Recurrence Control Effectiveness: N/AProvided by IHSNot fo

5、r ResaleNo reproduction or networking permitted without license from IHS-,-,-Documents Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Facilitiesa71 Risk Management/AssessmentAdditional 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 ResaleNo reproduction or networking permitted without license from IHS-,-,-