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Old 01-18-2016, 07:36 PM   #1
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Bonding circuit question

While working on my diesel fuel tank this weekend, I noticed that (by means of having to crawl over them) the prop shaft struts are not attached to the bonding system. The shafts have zincs that have lasted 1 year between replacements, but do the struts require bonding? While there, it is easy to accomplish, if necessary.
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Old 01-18-2016, 07:38 PM   #2
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If the shafts have their own zincs, then they're protected by those.

Ken
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Old 01-18-2016, 07:39 PM   #3
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If it has a zinc, it shouldn't need to be part of the bonding system.

Ted
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Old 01-19-2016, 07:10 AM   #4
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Does that go for the rudder as well?

does it not need to be bonded if it has a zinc? (I think I just tied my tounge in a knot)
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Old 01-19-2016, 07:56 AM   #5
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Does that go for the rudder as well?

does it not need to be bonded if it has a zinc? (I think I just tied my tounge in a knot)
Yes.

Ted
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Old 01-19-2016, 08:00 AM   #6
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Since the shafts run through rubber cutless bearings, how are they protected?
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Old 01-19-2016, 08:39 AM   #7
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The Shaft is connected to the trasnmission. The transmission in turn is connected to the engine, which is connected to the bonding circuit.
(ankle bone connected to the leg bone.....)
The Zinc is "Sacrificial" therefore will deplete itself rather than the shaft (or other devices such as rudders).
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Old 01-19-2016, 08:46 AM   #8
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Shafts and rudders should be bonded. And in most cases they are. In the case of the shaft, it's bonded by the fact it's coupled to the engine by the coupler to the transmission. If your using a isolation coupler you make the bonding connection with a strap/wire that that electrically connects the shaft to the transmission by the bolts on each side of the coupler. Or a bonding brush that rides on the shaft while connected to the bonding system.

In the case of the rudders, they are usually connected to the bonding system by the fact that rudder stocks are connected to the bonding system through the quadrant or arms attached to the stocks. Which in turn are connected to the bonding system one way or anther.
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Old 01-19-2016, 08:47 AM   #9
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Here is an article from Passagemaker that may make sense. I use this sometimes when explaining the bonding system to my customers.

http://www.passagemaker.com/channels...and-corrosion/
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Old 01-19-2016, 09:59 AM   #10
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Quote:
Originally Posted by kchace View Post
If the shafts have their own zincs, then they're protected by those.
Ken
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Originally Posted by O C Diver View Post
If it has a zinc, it shouldn't need to be part of the bonding system.
Ted
Ken, Ted
I agree technically with your statements but in practical terms see a problem.
The problem I see is that if there were no bonding system all of the underwater components w an anode would be protected - but only those components.
If only unprotected components (w/o anodes) are bonded they are still no protected - in fact the purpose of the bonding system is to tie all underwater components together so they are protected by the (few) components that have anodes.

From the article below that seadogmike linked...

"Second, and relevant in PMM’s test vessel case, when the bonding system is connected to a sacrificial anode, as it always should be, then that anode will afford protection to all metals that are interconnected and immersed in the same body of water. Such an arrangement makes it easier for a vessel operator to protect multiple metals by maintaining just a few anodes."
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Old 01-19-2016, 10:04 AM   #11
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... do the struts require bonding? While there, it is easy to accomplish, if necessary.
Based on my above post - my answer would be - if you want to protect the struts they should be bonded - if it's easy to accomplish Why not?

The bonding system has to be tied to other protected (w/ anodes) components - and sufficient qty / area to protect ALL of the underwater components.
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Old 01-19-2016, 10:05 AM   #12
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The question is the struts, not the shafts.
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Old 01-19-2016, 10:38 AM   #13
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The question is the struts, not the shafts.
You're right. I misread it. The struts should be bonded via bonding wires going from their mounting bolts to the bonding system.
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Old 01-19-2016, 11:23 AM   #14
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You're right. I misread it. The struts should be bonded via bonding wires going from their mounting bolts to the bonding system.
+1
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Old 01-19-2016, 11:42 AM   #15
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Perfect! While down there, I will do this next. Have the bonding wire already as I replaced many sections when I purchased the boat 2 years ago due to their poor condition, just need the correct terminal ends.
Thanks for the clarification.
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Old 01-19-2016, 01:38 PM   #16
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I'm an isolationist If the struts are not bonded now, and are not showing any signs of electrolysis, I definitely wouldnt waste time and possibly creating a new problem.
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Old 01-19-2016, 03:55 PM   #17
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Being an isolationist is fine. As long as you are totally committed to the cause.

As in all your underwater fittings are isolated.
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Old 01-20-2016, 12:45 PM   #18
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You're right. I misread it. The struts should be bonded via bonding wires going from their mounting bolts to the bonding system.
Wow, so did I. That's what I get for responding with brain not engaged. As others have said, struts should definitely be bonded or they won't be protected.

Ken
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Old 01-20-2016, 08:17 PM   #19
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you crawled over the struts? Is the boat upside down?
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Old 01-20-2016, 09:36 PM   #20
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The struts on my sporty are "bonded" to my aluminum tower, for a lightning path. Other than that no underwater metal is "bonded" to any other. I have zinks on my shafts for the simple reason of dissimilar metals. My shaft zinks last a very long time, on the order of over three years. I have ZERO electrolisis, none. I have meticulously "debonded" every boat I have owned, including this one. It works for me, very well. But old habits die hard. Bond away.
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