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Contract Number:
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Design Number:
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| Library File Number: | Submitted Date: 01/24/2012 |
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SR/Terminal/Vessel: M/V Chetzemoka |
Region: WSF |
| Contract Title: M/V Chetzemoka Investigation of Propeller Cracking, November 16, 2011 | |
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EXPERIENCE: Describe the particular situation or event. The MV Chetzemoka was brought to drydock on October 17, 2011 for completion of the installation of her rub rails as well as other miscellaneous work. The contractor chose to put the vessel on their syncro-lift for their benefit in completing the work package. The WSF Project Engineer used this opportunity to inspect areas of the vessel that are typically hidden. Based on the outcome of WSF’s investigation, it was determined that the propellers supplied for use on the Chetzemoka were of material that did not meet specifications. Repairs were affected on both propellers and were subsequently returned to the contractor and were reinstalled on the vessel. The remainder of the work package was accomplished and the vessel was launched and redelivered to WSF’s Eagle Harbor Repair Facility on November 9, 2011. |
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LESSON: Describe what knowledge was gained from the experience. When the vessel was pulled from the water, WSF”s Vessel Project Engineer was able to get a good look at the underwater hull, rudders, shafting, and propellers. This inspection revealed several hairline cracks in the number 1 propeller. Further inspection found the number 2 propeller to have similar cracking. Both propellers were removed from the vessel and brought to a third party inspector for metallurgical analysis and repair. The analysis discovered that both propellers were not within the specification limits as published by the American Bureau of Shipping (ABS) and not per WSF’s shipyard contract specifications. |
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RECOMMENDATION: Describe how the knowledge gained can be used. Take advantage of opportunities to study a problem. A latent defect warranty claim has been filed with the original vendor seeking the appropriate relief for replacement propellers. In the interim period, WSF has ordered one long lead (22 weeks) propeller as a spare. |
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Project Delivery Method: Design-Bid-Build Design-Bid-Build Phase: Maintenance |
Categories: Propulsion |
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