Page 1 of 2 12 LastLast
Results 1 to 10 of 16
  1. #1
    Join Date
    Oct 2012
    Location
    Southminster, essex
    Posts
    9,005

    Default Mooring chain rusting

    I have been servicing the moorings at St lawrence Bay on the River Blackwater for about 16 years. The ground chain we use is 19 mm & lasts at least 3 years.Above this we have 5 metres of 25mm multiplaite then 1,5metres of 16mm chain.
    Most owners lift their moorings on a 3 or 4 year cycle depending on size of boat.
    Each year our work boat is used to raise a length of the mooring to check the top chain, the thimbles on the multiplait & change the top shackles to the buoy if necessary.
    If they are all Ok it has been assumed that the chain at a deeper level is of better condition. This has always been so & is probably due to being in the mud & away from light & less oxygen etc..
    This year, due to loosing our old tug services we had to employ a tug from the Crouch. This meant that we had to raise all the moorings in one go.
    To our surprise & for the first time ever, we found that the chain at the bottom by the sinkers has deteriorated far quicker than that of the upper levels. So much so that a lot of moorings snapped & we lost the sinkers ( 11 out of 42) many due to poor chain.

    This can only be due to something in the surface of the seabed. A chemical perhaps, leaching out from the land further up river.
    Has anyone else noticed this phenomenon in the area?
    If I wanted to bring this to the attention of conservationists - who would I write to & where? Does anyone know who the correct government agency might be who might have an interest in this & where to write with my concerns?It would, of course need others to have noticed the same issue.
    It is all down to the fact that my wife does not understand me !!

  2. #2
    Join Date
    Nov 2002
    Location
    West Mersea
    Posts
    6,301

    Default Re: Mooring chain rusting

    Blimey. Worth thinking about. Environment Agency I guess.
    www.crossingthethamesestuary.com

  3. #3
    Join Date
    Nov 2004
    Location
    Medway, UK, boat in SYH
    Posts
    2,297

    Default Re: Mooring chain rusting

    would be v surprised if your theory is correct - what is going to leach out and only affect mooring chains? The introduction of any chemicals capable of affecting chain would have impacted on the fish etc quite quickly and be noticed.

  4. #4
    Join Date
    Nov 2002
    Location
    West Mersea
    Posts
    6,301

    Default Re: Mooring chain rusting

    Is there any common feature or correlation about the chain: e.g. different supply that is now affecting risers that had worn more than another supply.
    www.crossingthethamesestuary.com

  5. #5
    Join Date
    Feb 2005
    Location
    Essex
    Posts
    2,028

    Default Re: Mooring chain rusting

    I'm a member at Marconi - just up river from you by the sound of it. We lift our deep water moorings every year and have found that electrolytic action is the culprit in many chain problems. We ask all members to put anodes in their ground tackle - because where there are a number of different metals (chain, shackles, swivels etc) the current will flow. The thread on shackle pins is particularly weak - we recommend a tap-weld to secure, or a good seizing.
    Could the problems be electrolytic in nature, or is it pure wearing of links (which would imply far more movement than you'd expect)?
    Your suspected chemical cause sounds unlikely to me, I have to say.

  6. #6
    Join Date
    Oct 2012
    Location
    Southminster, essex
    Posts
    9,005

    Default Re: Mooring chain rusting

    Quote Originally Posted by Marmalade View Post
    I'm a member at Marconi - just up river from you by the sound of it. We lift our deep water moorings every year and have found that electrolytic action is the culprit in many chain problems. We ask all members to put anodes in their ground tackle - because where there are a number of different metals (chain, shackles, swivels etc) the current will flow. The thread on shackle pins is particularly weak - we recommend a tap-weld to secure, or a good seizing.
    Could the problems be electrolytic in nature, or is it pure wearing of links (which would imply far more movement than you'd expect)?
    Your suspected chemical cause sounds unlikely to me, I have to say.
    If there was electrolytic action it would work right up the chain (or so I would expect)
    We have used the same system for many years & it has always been the same
    Odd but we do not have problems with pins in shackles ( except idiots who do not fasten the penants to the buoys correctly & so send their boats down to you to recover for us !!!!!!!!)

    As an example It has been found that stainless steel chain does not last as long in the Crouch. This is due to the soil structure further up the river. having elements that affect the steel
    Is it possible that a section of sea bed & hence different soil structure has been exposed due to erosion etc
    Last edited by Daydream believer; 04-04-19 at 07:48.
    It is all down to the fact that my wife does not understand me !!

  7. #7
    Join Date
    Oct 2012
    Location
    Southminster, essex
    Posts
    9,005

    Default Re: Mooring chain rusting

    Quote Originally Posted by RivalRedwing View Post
    would be v surprised if your theory is correct - what is going to leach out and only affect mooring chains? The introduction of any chemicals capable of affecting chain would have impacted on the fish etc quite quickly and be noticed.
    ,
    Possibly , but has anybody commented or brought it to the notice of the relevant agency- whoever that may be?
    It is all down to the fact that my wife does not understand me !!

  8. #8
    Join Date
    Sep 2010
    Location
    Essex, near the R. Blackwater
    Posts
    3,532

    Default Re: Mooring chain rusting

    I am also a Marconi member and have found that your past experience is the same as mine, chain nearer the anchors lasts longer than that near the riser. I had to end for end mine last year to get one more year out of it. This year we are going to start a three year laying programme with annual inspections instead of taking up every mooring each year. I will pass on your observations to the guy in charge of moorings.
    He said, "All men will be sailors then until the sea shall free them."

  9. #9
    Join Date
    Nov 2004
    Location
    Medway, UK, boat in SYH
    Posts
    2,297

    Default Re: Mooring chain rusting

    Quote Originally Posted by Daydream believer View Post
    ,
    Possibly , but has anybody commented or brought it to the notice of the relevant agency- whoever that may be?
    over to you:
    https://www.gov.uk/report-an-environmental-incident

  10. #10
    Join Date
    Oct 2012
    Location
    Southminster, essex
    Posts
    9,005

    Default Re: Mooring chain rusting

    Quote Originally Posted by RivalRedwing View Post
    Thanks for that I will try them

    I think that the Blackwater is in a marine conservation area . Is there an agency for policing that or is it just a gimic?
    It is all down to the fact that my wife does not understand me !!

Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Latest YBW News

Find Boats For Sale

to
to