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Old 03-12-2013, 23:59   #16
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Re: Now a believer in bonding

I don't see anything that looks like black iron anywhere in the pics. Dezincified brass looks red since all the zinc is gone, leaving only copper. And if the longer nipple were black iron, it would be a lot more rusted, no?
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Old 04-12-2013, 08:08   #17
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Re: Now a believer in bonding

I've got the same boat, same year, same raw water strainer installation. No iron or steel pipe on mine. My guess is they're brass nipples and they've de-zincified. Sure looks that way to me from the pic's. Bronze pipe nipples are rare. I have only found them from Groco.
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Old 04-12-2013, 08:29   #18
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Re: Now a believer in bonding

Zboss, I think Sailorchick may be right about the iron pipe. It wasn't uncommon to use galvanized iron pipe on boats thirty years ago. A magnet will tell you right away if it's iron.
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Old 04-12-2013, 08:47   #19
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Re: Now a believer in bonding

Bonding works FOR ME. Why? Because the bonding is restricted to the DC system. The AC is isolated to itself, and only contacts earth ground at the dock's main AC panel. When I got the boat both the AC gnd, AC neutral and DC ground were connected in the boat. I was getting all kinds of leakage until I removed the AC component from the DC.
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Old 04-12-2013, 09:39   #20
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Re: Now a believer in bonding

So I was wrong. I think the elbow in the photo is black iron too. The copper patina on the elbow is from ion exchange which is another reason to change the sea strainer. The 4" nipple after the elbow looks like it had a hose on the end of it.

Dezincing of a brass nipple would have caused the threads to fail first and not the pipe nipple breaking in the middle.

I've a dollar that says that's black steel. You can see the flakes if you enlarge and zoom in on the photo's. Brass does not flake when it corrodes.

Hopcar could be right and it might have been galvanized steel. The zinc galvanizing would have protected the steel until the zinc was consumed, which would also explain the patina on the elbow and short nipple.
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Old 04-12-2013, 11:01   #21
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Re: Now a believer in bonding

putting a magnet on it should solve that mystery....
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Old 04-12-2013, 11:13   #22
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Re: Now a believer in bonding

A close nipple is almost all threaded, and at that advanced state of dezincification, it could break anywhere. I've been in the water business since 1984 and I've seen just about every conceivable combination of pipe materials. I've never seen galvanized or black iron covered with green corrosion like these pictures. Brass, copper, and bronze, yes.
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Old 04-12-2013, 11:48   #23
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Re: Now a believer in bonding

I don't see anything that looks like an iron corrosion, flaking layers.

What I see is a classic example of a cheap brass nipple that is dezincified. Brass and all brozne will turn pinkish not yellow, The yellow in brass is zinc.

When cheap brass, ie high content of zinc galvanicly corrodes, it appears like a pumas stone.

The lower one that was connected to the hose appears to be a better quality of bronze. If it were Iron it would be seriously wasted at the hose fitting. good Bronze can turn a deep red/brown that almost looks black. And certainly wouldn't show signs of the bronze patina as it does.

What I see here is a skipper that fails to take care of things. Any bronze fitting showing such a thick growth of patina is a sure sign of water leaks.

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Old 04-12-2013, 12:29   #24
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Re: Now a believer in bonding

I have got to get younger eyes. I enlarged #2 and sharpened it and yes its dezinc-ed. You can see the tiny holes where the zinc sacrificed itself.



So I was wrong.... again.

I actually see some pitting on the sea strainer housing too. So the zinc in the sea strainer is most likely gone too. But its a lower precentage then the fittings.

The good news is Zboss caught it just before it failed. That could have been nasty.
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Old 04-12-2013, 13:50   #25
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Re: Now a believer in bonding

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Originally Posted by SVNeko View Post
26 years, come on.
My Grocco through hulls are 37 years old, all isolated and immaculate. Some of the worst corrosion issues I have seen with boat fittings have been bonded. My first observation was also a problem with the nipple, doesn't appear to be a marine setup, looks like somebody along the way used a regular household setup here and as expressed its a dissimilar metal issue.
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Old 04-12-2013, 18:53   #26
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Re: Now a believer in bonding

I am pretty sure everything on the boat was original.

I ended up drastically reducing the complexity of the whole strainer system. I now just have three parts... the strainer and two of these:

Groco Pipe-to-Hose Elbow Fittings (FFC series)

Much nicer and cleaner all around.

On top of that, the new strainer has an easily accessible lid so that encourages regular checks of the strainer.
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Old 04-12-2013, 21:31   #27
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Re: Now a believer in bonding

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Originally Posted by rtbates View Post
Bonding works FOR ME. Why? Because the bonding is restricted to the DC system. The AC is isolated to itself, and only contacts earth ground at the dock's main AC panel. When I got the boat both the AC gnd, AC neutral and DC ground were connected in the boat. I was getting all kinds of leakage until I removed the AC component from the DC.
+ 1

If it's not already properly grounded, why are you even plugging into it?
Sketchy marina?
Just another good reason for solar, LiFePo4's aerogel...
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Old 04-12-2013, 21:32   #28
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Re: Now a believer in bonding

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Originally Posted by rtbates View Post
Bonding works FOR ME. Why? Because the bonding is restricted to the DC system. The AC is isolated to itself, and only contacts earth ground at the dock's main AC panel. When I got the boat both the AC gnd, AC neutral and DC ground were connected in the boat. I was getting all kinds of leakage until I removed the AC component from the DC.
+ 1

If it's not already properly grounded, why are you even plugging into it?
Sketchy marina?
Just another good reason for solar, LiFePo4's Aerogel insulation ...
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