REG NASA-LLIS-0216-1993 Lessons Learned - Altitude Tanks Vacuum Pumps.pdf

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1、Lessons Learned Entry: 0216Lesson Info:a71 Lesson Number: 0216a71 Lesson Date: 1993-06-15a71 Submitting Organization: LERCa71 Submitted by: S. PapellSubject: Altitude Tanks Vacuum Pumps Description of Driving Event: Before starting up vacuum pumps to lower the pressure in an altitude tank, the reser

2、voirs of the pumps were checked for proper oil level. The levels were found to be low and about 5 to 7 gallons of oil were added to the reservoirs of each pump. The pumps were then turned on to start pumping against their isolation valves. When the valves were opened to the tank to allow high gas fl

3、ow to the pump inlet, oil was discharged through the vent system to the roof of the building. Because of the pressure build up, an elbow in the vent line separated and spilled oil on the pump room roof and the parking lot next to the building.The investigating committee determined that a false readi

4、ng was obtained when the oil levels of the pumps were checked prior to starting them up. The missing oil was in the inlet cavities of the pumps and not in the reservoirs where the oil level is measured. When the pumps were started, the excess oil was forced from the inlet cavities to the pump reserv

5、oirs, thereby overfilling them.Lesson(s) Learned: Excessive oil consumption by vacuum pumps should be evaluated as a problem prior to adding oil to prevent overfilling the pump reservoirs.Recommendation(s): Check oil level in vacuum pumps only after the pumps are pulled through or run to assure that

6、 all oil is in the reserviors and not in the inlet cavity.Evidence of Recurrence Control Effectiveness: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/ADocuments Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Hardwa

7、rea71 Logisticsa71 Test FacilityAdditional Info: Approval Info: a71 Approval Date: 1994-04-19a71 Approval Name: Maria Havenhilla71 Approval Organization: LERC/EBASa71 Approval Phone Number: 216-977-1483Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-