Chris 249 said..Quixotic said..Kryspen said..
Previously i posted about advice on anchor chain replacement - 8mm.
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Talking to Muir about the chain i even got decent quote. But i also started looking about anchor chains on the net.
What I found ( just as well ) is that proper anchor chain, like grade L should be galvanized to Australian standards with Zink thickness at least of 75 - 89 microns minimum if anyone is using occasionally . But if someone like myself sitting on anchor 24/7 , the Zink thickness should be basically 100 microns.
I also found that chain supplier should provide manufactures certificate of the chain. The 100 microns Zink galvanized should last at least 3 years when constantly submerged in salt water .
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Well, the search is on.
Hi
I've seen a table that suggests Muir 8mm anchor chain has zinc thickness of 72 micron (see below from
marineinnovations.com.au/product/australian-short-link-grade-50-chain-8mm/ )
As I understand it, that's consistent with HDG600 which is based on grams of zinc per square metre (ie 600 per sq m) which is meant to yield a minimum local thickness of 70 microns, and an average of 85 microns.
I've heard of HDG900 which takes you to an average of 125 microns thickness.
If you want 100 microns average, then you'd need 720 g/sqm
I've not come across anchor chain that had that thickness of zinc. But then I haven't really gone looking.
There are outfits that specialise in galvanising steel as a business. They may be open to galvanising a length of G50 8mm steel chain. And they may be able to do it to 100 micron thickness.
Not sure what it would cost you.
As someone who seems to be across this, what thickness do you recommend?
Our chain is ageing and I’m looking to get a full Muir setup with an anchor winch and two rodes. I haven’t checked chain size yet for our 5000kg 36 footer but I think it will be 8mm so 72 micron gal if we use Muirs.
My research on this - normal mooring for 8mm, galvanised thickness should be 75 to 80 microns, but looks like is not easy to find any suppliers providing certificate stating zink thickness. Stick to Muir winch, parts available if you need. Lewmar is not so easy on parts and very expensive.
