Next message: Peter Bennett: "Re: TWL: Low battery charge from alternator"
At 01:46 PM 12/4/03 -0800, you wrote:
>About a year ago some lots of Aluminum 5083-H321 made by Alcan America
>were found to be defective when used in marine service. This alloy
>consists of aluminum and about 3% magnesium, plus some other small amounts
>of other metals.
>The following information was obtained from Mr. Teachout at the USCG
>office in Seattle.
It so happens that a presentation was made Today at the Workboat conference
in New Orleans.
There are 2 or 3 articles about this subject in Maritime Reporter. May and
November of this year 2003.
"F3 Marine Aluminum Plate: New ASTM Standard Spec B928
10:00 am - 11:30 am
During the winter of 2001-2 over 200 aluminum vessels, ranging from six to
44 meters in length were diagnosed as having been built with 5083-H321 or
H116 temper aluminum plate that was susceptible to intergranular corrosion.
This presentation will cover the discovery of the problem, the forensic
process, and the short-term aluminum purchase specifications used during
the start of the repairs. It also introduces the new ASTM B928 Standard
Specification for High Magnesium Marine Aluminum Alloy Sheet and Plate for
Marine Service and discusses the ramifications for the shipbuilding
industry."
Capt. Mike Maurice
Wilsonville, Near Portland Oregon
_______________________________________________
http://lists.samurai.com/mailman/listinfo/trawler-world-list
To Unsubscribe send email to
Include the word "Unsubscribe" (and nothing else) in the subject or body of the message.
