Reply
 
Thread Tools Search this Thread
 
Old 08 December 2005, 09:10   #11
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Quote:
Originally Posted by hard1
Thank you for your replies. I thought there might be someone on this forum who knows something about marine electrolysis - a friend has suffered serious damage to shafts and P brackets and suspects the presence of a dumb lighter in the marina, which has electrical power to welding sets and zero anodes as the likely cause, but has been faced with denials by marina officials and the barge owners. He is looking at repair bills in the order of '000's even though his boat is correctly protected as verified by a marine surveyor. I hasten to add that this is not local to me (we have several dredgers and barges in local marinas as I speak).
The comments I made were perfectly valid and make a HUGE difference!!!
__________________

__________________
codprawn is offline   Reply With Quote
Old 08 December 2005, 10:50   #12
Member
 
Country: Other
Length: no boat
Join Date: Aug 2005
Posts: 623
Quote:
Originally Posted by codprawn
The comments I made were perfectly valid and make a HUGE difference!!!
Valid - probably, HUGE difference - possibly, useful information - no. Thank you anyway.
__________________

__________________
hard1 is offline   Reply With Quote
Old 08 December 2005, 11:04   #13
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
But thats the whole point - there are so many variables to take into account. It is a simple basic concept that is affected massively by all the variables.

With so many variables to take into account the marina people and the barge owners can wriggle out of almost anything.
__________________
codprawn is offline   Reply With Quote
Old 08 December 2005, 11:45   #14
Member
 
Country: Other
Length: no boat
Join Date: Aug 2005
Posts: 623
Quote:
Originally Posted by codprawn
But thats the whole point - there are so many variables to take into account. It is a simple basic concept that is affected massively by all the variables.

With so many variables to take into account the marina people and the barge owners can wriggle out of almost anything.
Look, I thank you for your input but I didn't want speculation, I wanted tacit assistance. This I got from Jono. Another time I would be only too happy to enter into a debate about the esoterics and theory of marina design, water flow and how these variables could affect electrolysis and galvanitic activity depending on the salinity etc etc.

Thanks once again...
__________________
hard1 is offline   Reply With Quote
Old 08 December 2005, 15:46   #15
exspyrd trayd membir
 
The Garfish's Avatar
 
Country: Ireland
Town: inn wiliks hed
Make: Redbay 6.5
Length: 6m +
Engine: Twin Etec 90hp
Join Date: Aug 2003
Posts: 962
Quote:
Originally Posted by hard1
Look, I thank you for your input ..........

Thanks once again...
i fink dat ard wan iz bustin a gutt tryin too bee polyte. wot hee reely meens iz shutt de fukk upp

gArf
__________________
luk arfter numbir wan, downt stepp inn numbir too
The Garfish is offline   Reply With Quote
Old 08 December 2005, 16:22   #16
Member
 
Hugh Jardon's Avatar
 
Country: UK - England
Town: Reading, Hants
Boat name: Juicy
Make: Sealine F43
Length: 10m +
Engine: 2 x 370hp
MMSI: TBC
Join Date: Sep 2005
Posts: 2,882
Quote:
Originally Posted by The Garfish
i fink dat ard wan iz bustin a gutt tryin too bee polyte. wot hee reely meens iz shutt de fukk upp

gArf
love it and if you know mr ard wan he was being very very restrained and polite indeed, looks like fish boy has got the message anyway!!! makes a fckin change i must say!!
__________________
Hugh Jardon is offline   Reply With Quote
Old 08 December 2005, 17:41   #17
Member
 
Country: Other
Length: no boat
Join Date: Aug 2005
Posts: 623
Quote:
Originally Posted by The Garfish
i fink dat ard wan iz bustin a gutt tryin too bee polyte. wot hee reely meens iz shutt de fukk upp

gArf

Hmmmm, I been sussed.
__________________
hard1 is offline   Reply With Quote
Old 09 December 2005, 03:33   #18
Member
 
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,841
In my opinion, for what it's worth is that the prob was with your mates boat. I managed a 70ft steel ketch for a guy for a while. Electolisis was a major issue on a boat of this type with numerous AC and DC systems on board. We had marine electrical engineers aboard here and abroad and it is quite a complicated topic. I think, despite what you've been told by a "marine" engineer ( a lot of marine engineers are pretty foggy on this subject) that you had an earth leak. The boat was presumably hooked up to shore power which is the major culprit. The anodes would have soon gone, then the trouble begins. We kept the ketch for months in marinas in Hong Kong. Crete, Malta, Majorca and Lisbon. None of these places are too fussy about pontoon isolation etc and we never had a problem. On the main control panel we had "Earth Leak" warning lights which would glow if we were leaking through the hull or a fitting. If it were from welding or the pontoons why did it not "eat" every boat in the marina? Sorry, but I think that it's dig deep and learn for next time. In m opinion.
__________________
Mollers is offline   Reply With Quote
Old 09 December 2005, 15:42   #19
RIBnet supporter
 
Erin's Avatar
 
Country: UK - Channel Islands
Town: A large rock
Boat name: La Frette
Make: Osprey Vipermax
Length: 6m +
Engine: 200 Suzzy
Join Date: May 2004
Posts: 2,830
Mollulnan's on the right thread I think with his reference to an earth indicator light. Most top spec shore power circuits on a boat will have a 'galvanic isolator'. This isolates the boats earth circuit (which should be bonded to all metal components) from the shore power earth. It allows large currents through in the event of a fault, but stops the small millivolt currents which cause galvanic corrosion. This doesn't mean that there wasn;t something seriously wrong with the marina that caused the problem. Sounds like your mates boat was electroplating the marina pontoons!

Keith
__________________
Erin is offline   Reply With Quote
Old 09 December 2005, 16:30   #20
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Quote:
Originally Posted by Hugh Jardon
love it and if you know mr ard wan he was being very very restrained and polite indeed, looks like fish boy has got the message anyway!!! makes a fckin change i must say!!
What message??? Please explain it to me oh Hugh one......
__________________

__________________
codprawn is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 16:52.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.