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  #11  
Old 02-12-2011
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Originally Posted by svjobeth View Post
... in between my last post and your reply, I did some quick calculations and now know that when sailing on port tack, the pump is most definitely above the waterline. Seems as if the check-valve may be the best present solution.
Take a look at Polypropylene Check Valve Series 694 | U.S. Plastic Corp. . This might be just what you need and they are far less costly than anything at WM/Defender et al. We have the US Plastics mini-check valves in our A/C system.

FWIW...
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  #12  
Old 02-12-2011
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Originally Posted by svHyLyte View Post
Take a look at Polypropylene Check Valve Series 694 | U.S. Plastic Corp. . This might be just what you need and they are far less costly than anything at WM/Defender et al. We have the US Plastics mini-check valves in our A/C system.

FWIW...
Thanks for the info. I'll take a look-see.

Incidentally, I unmounted the strainer and it does have some hairline cracks in the housing. So, that will be replaced as well.

Ah the fun!
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S/V Jo Beth
1984 Pacific Seacraft Crealock 34, Hull #16

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"Twenty years from now you will be more disappointed by the things you didn't do, than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover."
- Mark Twain

Last edited by svjobeth; 02-12-2011 at 01:59 PM.
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Old 02-13-2011
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Originally Posted by svjobeth View Post
Thanks for the info. I'll take a look-see.

Incidentally, I unmounted the strainer and it does have some hairline cracks in the housing. So, that will be replaced as well.

Ah the fun!
Unfortunately, the plastic bowls on strainers seem to be a problem area as we've discovered several times (to our dismay).

Good luck!

s/v HyLyte

PS: We just had a look at your website. Far be it from me to advise a marine surveyor regarding your electrolysis issue, but we had a similar problem and by accident discovered that a sharp edge of our copper foil grounding strap had chafed a hole in the insulation on one of our power cables under and behind the engine. Replacing the cable and covering it with shielding solved our problem although that exercise was a serious PITA!!!
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Old 02-13-2011
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Originally Posted by svHyLyte View Post
Unfortunately, the plastic bowls on strainers seem to be a problem area as we've discovered several times (to our dismay).

Good luck!

s/v HyLyte

PS: We just had a look at your website. Far be it from me to advise a marine surveyor regarding your electrolysis issue, but we had a similar problem and by accident discovered that a sharp edge of our copper foil grounding strap had chafed a hole in the insulation on one of our power cables under and behind the engine. Replacing the cable and covering it with shielding solved our problem although that exercise was a serious PITA!!!
No worries. Surveyor's don't know everything...and I say that at tremendous risk of being banished from the brotherhood! I often consult with experts in various disciplines, and am consulted often by experts for my opinions.

Electrolysis can be such a far and wide ranging issue. However, I'm beginning to suspect the root of our problem may be similar to yours. We removed the SSB installation from Jo Beth when we bought her; both tuner and radio were old and tired and we really didn't need it as we wouldn't be ranging far offshore for a while. While we removed miles of unused cabling from the prior owner's various radio installs, we decided to leave the copper strip intact. You know, should we decide to put SSB back on board. We repatriated the breaker for the old SSB circuit to another use.

Long story short, we do have several places where the copper strapping and wiring are in contact, along with some tears in the foil itself. With the former SSB breaker now handling our 12vDC outlets, well...Plus, we have an incomplete bonding system. Add to that, that I still think there's an issue with our marina docks as dozens of boats on different docks have identical issues. I'm not above installing a galvanic isolator in the boat, but if the problem be us, that won't be a guaranteed fix.

I'm glad to see you got your issue resolved. We'll see on our end. right now, I'm well stocked in zinc collars and have a diver on an every 60 day cycle to be sure we stay ahead of it until it's fixed.

Best
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S/V Jo Beth
1984 Pacific Seacraft Crealock 34, Hull #16

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- Mark Twain
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