Administrative Report Or Publication
 

Trawl cable corrosion

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https://ir.library.oregonstate.edu/concern/administrative_report_or_publications/wd375x195

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  • Pacific Northwest trawl fishermen spend an estimated $625,000 every year to replace corroded trawl cable. If the Pacific North­west shrimp fleet is included, the yearly cost greatly exceeds one million dollars. Fishermen could save hundreds of thousands of dollars and increase the net return to the individual fisherman if they could extend the life of their trawl cables by 25 percent. This project analyzed the nature of trawl cable corrosion on Oregon coastal trawlers to evaluate the feasibility of corrosion control. The analysis leads to a detailed discussion of possible future experiments designed to accurately determine the amount and type of protection needed. This report also provides a discussion of wire rope and general corrosion principles. The corrosion analysis is based on a series of tests conducted on corroded trawl cable that Oregon trawl fishermen donated. Samples of used trawl cable were tested with regard to decreased breaking strength, weight loss and wire diameter reduction. These results, compared with results obtained from comparable new trawl cable, yielded the following conclusions: 1. Used wire rope is significantly lighter, has a significantly smaller wire diameter and has a significantly reduced breaking strength than new wire rope. 2. Trawl cable attached to bare steel trawl doors shows all of the above effects to a significantly greater extent near metal doors than 10 fathoms away. These results lead to the hypothesis that galvanic corrosion decreases the trawl cable life and, in particular, that trawl cable galvanically protects metal trawl doors. The report suggests that sacrificial metal protection and/or electrical isola­tion between trawl cable and metal doors will most likely protect the cable, and proposes a series of experiments to determine accur­ately the need and usefulness for each type of protection.
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