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| RH-ARIEL |
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Message ID: 31
Entry time: Wednesday, April 12, 2017, 10:52
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| Author: |
Jason Kapalka |
| Category: |
T-Hall Crane |
| Type: |
Repair |
| Subject: |
ARIEL Target Hall crane oil leaks & inspection plan |
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| On March 29, 2017, a 9 tonne load was transferred in the ARIEL Target Hall with the overhead crane (TRIUMF crane #44). On April 3, 2017, several drops of green oil were observed on the floor and hookblock directly beneath the single equalizing sheave. The Remote Handling department millwrights were notified and an inspection of the crane using a man-lift was performed to verify the source of the oil leak. Upon inspection, it was confirmed that the green oil leak was coming from the bearing on the single balancing sheave. This sheave wheel is rarely moved since it's primary purpose is to equalize the wire rope between the hook block and the two hoists; however both hoists have remained relatively synchronized since the crane installation in the summer of 2015. The millwrights suspect that the grease inside the sheave bearing has separated due to inactivity and the low viscosity fluid slowly weeps out. The leak rate was estimated at less than one oil drop per day.
During the inspection to find the source of the green oil leak, black oil was observed on top of both crane bridge girders. The apparent source of the black oil is the redundancy (aka failed drive bypass) system gearbox on the north and south side of the trolley. This black oil leak was significantly larger than green oil leak, and the question was raised about whether it was noticed during the annual inspection of the crane. Upon review, it was discovered that this crane was not yet added to the list of TRIUMF cranes that are inspected annually (typically performed during January-March), presumably due to its infrequent use. A request was made and this crane was added to the inspection list. Both leaks will be investigated further when the crane receives its annual inspection in April or May (which will be conducted by a third party service company) and the findings and recommended actions will be documented in this E-Log entry. |
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