[Milsurplus] cathodic hull protection

[jcoward5452 at aol.com]

Hi Folks,
 I worked in a boatyard for a couple years, actually the Edgartown Marine, which was commandeered by Universal Studios for the filming of the original "Jaws" movie. It was interesting to be operating in the background supporting the filming crew.My role was operating the lift platform for raising the sunken "Orka" replica and pumping gas for all the support boats. I got to touch, feel, and ask the questions to the designers of those hydraulically operated sharks before they ever entered the water."Fascinating" does not describe the ingenuity of those Hollywood engineers! I have other anecdotes relating to how Uni.Stud. treated their hired help and how the price of any item in the "store" was "renegotiated"!
 As to the cathodic hull protection:
  As a matter of course, when preparing a boat for launching for our summer customers, a full scraping, sanding,
and waterline "cutting" and re-paint of the anti foiling paint was part of the preparation process. If the boat was a motor operated vessel, it would have the "leads" replaced (as needed), especially if the vessel had radio gear, but all electrical equipment is susceptible to galvanization effects. Bigger boats had bigger "leads". My Dad replaced his every two years on our Bertram "31". ( I still have his Appelco AM txciever with remote control and Carter "Genemotor". Last I plugged it all together it worked just fine.
 If there is any chance of galvanic action, provide a known place for it to happen that can be monitored and components replaced.
 My $.02
             Jay KE6PPF




-----Original Message-----
From: Boeing377 <boeing377 at aol.com>
To: milsurplus <milsurplus at mailman.qth.net>
Sent: Mon, Oct 25, 2010 3:30 pm
Subject: [Milsurplus] cathodic hull protection



I don't know about the sea critters.  Cathodic protection is very
mportant to pipelines, piers, building foundations, etc, anything
etallic in contact with soil or water. "
I've used CAPAC systems on ocean going vessels and never seen them have any 
oticeable effects on barnacles and other critters that like to add drag to your 
rop and hull. The impressed current cathodic protection systems can eliminate 
he use of sacrificial metal anodes such as ones made of zinc.
Toxic bottom paint is still the only effective remedy to keep hulls from fouling 
ith marine organisms. Civilians have to use less effective copper oxide 
ntifouling paint compounds.  The feds can use anything they want, like 
ri-butyltin, TBT which works GREAT but creates problems as it ablates and 
nters the ecosystem.
f I use what the US Navy uses I am committing a felony. 
Ultrasonic energy has been touted as an antifouling solution, but I have had 
arnacles grow all over my sonar transducers so I am a skeptic.
What does this have to do with mil surplus?  Civilians can't legally use the USN 
BT ant-fouling bottom paint they bought through surplus channels.
http://nsglc.olemiss.edu/Advisory/Antifouling.pdf
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