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Old 09-05-2018, 16:29   #31
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Re: Replace this seackock & thru hull, right?

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Originally Posted by kapnkarl View Post
It may be a theory, but ABYC standards and industry experts seem to feel it's pretty important. Your mileage may vary.

http://stevedmarineconsulting.com/wp...tems138_05.pdf
I'm pretty sure that ABYC does not indeed require or even suggest bonding sea cocks or through-hull fittings:

"E 1.4 c. Items Not Required to be Bonded (I) Electrically isolated through-hull fittings need not be connected to the bonding system. (See ABYC E-2, "Cathodic Protection".) "
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Old 09-05-2018, 21:15   #32
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Re: Replace this seackock & thru hull, right?

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Originally Posted by S/V Alchemy View Post
Generally, if you are self-prompted to ask, the answer is "yes". I agree with all the other suggestions above.
I second that! Nearly every time I answer “no” to that question, it is the very next thing to break....
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Old 09-05-2018, 21:25   #33
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Re: Replace this seackock & thru hull, right?

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Originally Posted by Pete7 View Post
The issue of bonding through hulls seems to be a US thing (possibly wider). Certainly UK and many European boats do not have through hulls bonded together.

On my own yacht only the S/S rudder shaft is connected to the hull anode. The S/S propshaft has its own anode. The Bronze through hulls are all separate and will remain so.
Mine also
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Old 11-05-2018, 11:21   #34
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Re: Replace this seackock & thru hull, right?

In europe bonding is proposed to the engine mass
In D'Antonio paper, to the stud of the external anode.

My boat, built to good professionals, had no bonding for 30years on the thru-hills, but l will have it soon.

Yep, Manfredini is said to be best choice ahead of R.Guidi, still excellent. They have collars with a pin for the terminal.
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Old 11-05-2018, 11:34   #35
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Re: Replace this seackock & thru hull, right?

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Originally Posted by flyingfin View Post
This observation of lack of bond wire is most important comment yet! If indeed there was no bond wire, I would pull the boat out of the water soon, then yank on the valve with your gloved hand. If the assembly does not break off in your hand, the threaded thru hull fitting may still be sound. Of course with 19 years underwater, it should be removed and re-bedded at the least.

Clean it all up with CLR, then grab a wrench and pull the 90 bend and valve off the thru hull. Make sure you install a ground wire and decent marine thru hull valve.
Not at all. There is a long ongoing dispute about bonding or not bonding. Most my boats have been not bonded and the bronze etc has been very much inert and fine. In fact , Tying things together can create pathways for corrosive currents, especially if tied to the engine.
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