Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 09-09-2016, 19:30   #1
Registered User

Join Date: Sep 2016
Posts: 2
Hot marina "help"

We have owned our 35 ft sloop for nearly 30 years. We haul every year. It is expensive but we like to keep her in as tip top shape as possible.
Three years ago we moved to a new marina. I didn't equate the problems at first but my water pump">raw water pump basically disintegrated. I bought another one as it is the only problem we have had since changing in 2010 to a D130 volvo. It has been a excellent engine and I thought raw water pump maybe a weak link??
However a year later the new pump was leaking out the cover plate and finally I realized what was going on. Electrolysis.
I put a new shore power protector on, even though I didn't think it needed it, but by the 2nd year haul out, zincs were 70% gone and some erosion on the keel was evident.I replaced hull zincs and saildrive zinc.
But then after labor day trip I was checking my engine room and sure enough the raw water pump cover is starting to leak.
I talked to the port manager about the water and he tested it noting my electrical was good but it showed I didn't have zinc protection. He noted there was a problem boat that said he had fixed electrical problems but hadn't and there were 3 other boats in my same condition because of it.
I put on scuba gear and sure enough they are almost gone. So after a little history this is my issue.

I am rewiring the entire boats ground system. copper screen throughout the bow and stern, wired both aft to buss bar, mast ,chainplates, etc etc.
We have a saildrive and since the beginning we turn off a ground break switch to kill power to the engine and it has always worked but now I am in a conundrum. If I wire it all to the engine ground it effectively takes that ground break out. If I don't wire it that way how do I have a bonded system? At some point there has to be a wire to the water doesn't there? If I have explained this well enough then how do I accomplish both isolating the engine and having a full time ground??
Hopefully someone out there has had similar problem (s)

Thankyou
Randy
__________________

__________________
redboat42 is offline   Reply With Quote
Old 09-09-2016, 22:39   #2
Registered User

Join Date: Jun 2013
Location: canada
Posts: 1,373
Re: Hot marina "help"

if it's not your boat (it wasn't for 28 years) there is really nothing you can do but move.

galvanic isolators and transformers help somethings but not all.

but you should make sure it's working. this is best done with a silver silver chloride cell and somebody who knows what they are doing. (not many will) because you need to both test the working of the isolator (diode test) but also if it's being bypassed by a N-G bond or other wiring issues.

testing the isolator is easy. unplug your shore plug from the dock, and bring the cord inside the boat. near the AC panel. (with the boat end still plugged in) measure ohms from the ground on the plug to the AC ground bus on the boat. if you read 0ohms you do not have a working isolator. or it is wired wrong. if you read something higher, test it in diode mode. you should get around 0.9v. if you switch the leads around you should see this both ways. often you have to leave the meter connected for a while as it discharges and recharges the isolator in the opposide direction when you swap leads.

this tests the isolator itself but doesn't rule out other issues on the boat which may allow it to be bypassed. but testing it the above way tells you if it's in the correct spot on the ground line. vs just measuring both sides of the isolator.

everyone will have different theorys on bonding. and they all have pros and cons. reality is bonding everything is more for safety reasons and less for corrosion protection issues.

get a clamp meter that will show AC and DC amps. check the shore cords of the boats around you in both AC and DC. they should all show 0a in both if they are good. if any show AC that is scary, and the marina should be told and they should unplug it. and any show small dc (20ma-200ma) then they don't have isolators and that is somewhat normal. they are either losing zinc faster or stealing other peoples zinc depending on the current flow direction. if you see higher then 200ma then they probably have issues.
__________________

__________________
smac999 is offline   Reply With Quote
Old 14-09-2016, 19:59   #3
Registered User

Join Date: Jan 2008
Location: SF Bay Area (Boat in La Paz)
Boat: Valiant V40
Posts: 278
Re: Hot marina "help"

It is often a single nearby boat causing the problem. Try moving to a different slip if possible.

Also, completely disconnecting from shore power can improve things significantly. Even a relatively small solar panel might (depending on you electrical usage and boat-use frequency) keep your batteries happy, it doesn't need a permanent installation either.

Finally, hanging a grounded spare zinc (I use old hull zincs) over the side can both provide some extra zinc and an early warning that your zincs are eroding. (Yeah, I know it is possible to over-zinc)
__________________
jamhass is offline   Reply With Quote
Old 15-09-2016, 01:00   #4
Registered User

Join Date: Jun 2013
Location: canada
Posts: 1,373
Re: Hot marina "help"

it's not possible to over zinc a fiberglass boat.

it is an issue with wood boats though.
__________________
smac999 is offline   Reply With Quote
Old 15-09-2016, 06:10   #5
Registered User
 
stevec195's Avatar

Join Date: Oct 2011
Location: Fairhope, AL
Boat: Allied Seawind II #103
Posts: 140
Send a message via Skype™ to stevec195
Re: Hot marina "help"

Easy on the diving mate! If you got the suspicion that there is stray current, remember that it only takes milliamperes to render you DEAD. A majority of marinas prohibit diving under any circumstance, and the ones that allow it have a protocol for shutting off the juice to the entire dock system prior to going in the water.


Sent from my iPad using Cruisers Sailing Forum
__________________
stevec195 is offline   Reply With Quote
Old 15-09-2016, 06:45   #6
Registered User
 
Sandero's Avatar

Join Date: Apr 2006
Location: Southern Westchester/Northport LI
Boat: Shiva - Contest 36s
Posts: 4,072
Re: Hot marina "help"

This is very troubling. Is there any way to probe the electrical state of the water around the OP's boat? If so how would this be done?
__________________
Sandero is online now   Reply With Quote
Old 15-09-2016, 07:27   #7
Registered User

Join Date: Aug 2010
Posts: 357
Re: Hot marina "help"

Quote:
Originally Posted by stevec195 View Post
Easy on the diving mate! If you got the suspicion that there is stray current, remember that it only takes milliamperes to render you DEAD. A majority of marinas prohibit diving under any circumstance, and the ones that allow it have a protocol for shutting off the juice to the entire dock system prior to going in the water.

I agree it has long been advised not to swim in marina's and boat ramps. However, I've been in many and have NEVER seen this policy in the rules. Not saying that these rules don't exist. I'm just calling 'foul' on the assertion that this is a widely adopted practice at a 'Majority' of marinas.
__________________
Shrew is offline   Reply With Quote
Old 15-09-2016, 08:40   #8
Registered User

Join Date: Oct 2011
Location: miami,fl
Boat: EggHarbor,Sportfish,35
Posts: 73
Re: Hot marina "help"

Divers in our marina routinely clean bottoms once a month on all boats. Never turn the juice off.
__________________
landsend is offline   Reply With Quote
Old 15-09-2016, 09:50   #9
Registered User
 
ShaktisBoy's Avatar

Join Date: Mar 2007
Location: West Palm Beach Florida
Boat: 07 Leopard 40 / 93 Hunter 30T
Posts: 313
Re: Hot marina "help"

Salt water or fresh? It makes a difference especially where diving is concerned. Fresh water will kill you quick. Much easier for stray current to pass through salt water than your body greatly reducing the risk of getting shocked.


Sent from my iPad using Cruisers Sailing Forum
__________________
ShaktisBoy is online now   Reply With Quote
Old 15-09-2016, 11:47   #10
Registered User
 
stevec195's Avatar

Join Date: Oct 2011
Location: Fairhope, AL
Boat: Allied Seawind II #103
Posts: 140
Send a message via Skype™ to stevec195
Re: Hot marina "help"

So really now. If you truly suspected there was stray current in the water-you would hop in the drink because your marina had no policy on way or the other?


Sent from my iPad using Cruisers Sailing Forum
__________________
stevec195 is offline   Reply With Quote
Old 15-09-2016, 12:13   #11
Registered User

Join Date: Oct 2011
Location: miami,fl
Boat: EggHarbor,Sportfish,35
Posts: 73
Re: Hot marina "help"

That's what I pay the diver for. Seriously never really thought about it, you bring up a good point. I wouldn't get in the water for fear of catching a disease in my marina.
__________________
landsend is offline   Reply With Quote
Old 15-09-2016, 12:25   #12
Registered User
 
Mark Stillwell's Avatar

Join Date: Jul 2013
Location: Missouri
Boat: Beneteau 393
Posts: 96
Re: Hot marina "help"

I'm confused. The marina is aware of the issue and knows it is one boat that is causing the problem. Why isn't the marina dealing with the captain? Our marina manager would have it fixed or turn off the electricity.
__________________

__________________
Mark Stillwell is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
HOT HOT HOT! running AC on Honda generator sailorboy1 Plumbing Systems and Fixtures 12 09-07-2013 18:07
Hot Water System - Extra Hot Water Needed ? Harben Plumbing Systems and Fixtures 8 07-10-2010 17:20
"recent price reduction""owner anxious""bring all offers" sailorboy1 Dollars & Cents 10 22-01-2009 12:25
Hot water is TOO hot. By Invitation Construction, Maintenance & Refit 10 18-08-2007 07:02
Ohhhhh Hot! Hot! Hot! knottybuoyz Marine Electronics 6 01-06-2007 08:43


Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 10:24.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.