Chromox Duplex (Stainless) chain for rode.

[Muaddib1116]

Originally Posted by thinwater

SWL is derived from both the fatigue limit of the material (50% for this material) plus an allowance for manufacturing tolerances and corrosion. The basis varies with manufacture, but some thing like 3-6 sigma endurance over 100,000 cycles. In this case, they are almost certainly basing it only on the fatigue limit of the alloy, which makes this a dangerous exaggeration. Like other manufactured parts, 25-33% is more realistic.


Because of vulnerability of SS to fatigue and crevice corrosion (which you will not see--it only takes one crack in one weld in one link), the useful life at high load will be similar to galvanized chain in regular use. It will look better and pile better, but should still be replaced in 5-7 years.

I'm certainly no expert on this type of thing, but wouldn't fatigue limits be based on load cycles that load up to some amount close to or above the SWL? In which case, anchor chains, whether galvanized or SS probably spend very little time/cycles anywhere near those loads.

[CaptainRivet]

Originally Posted by Simi 60

I do have concerns about disimmilar metals.
No way would I get a S/S anchor and I have an issue with s/s shackles.

How do you connect your anchor to the swivel or chain directly?
Cut one link open and directly connected the anker? If yes did you xray the weld?
Otherwise you need a SS shackle?
Well i already mixed for several years as the swivel is stainless as all of the good ones on a galvanized chain and anker. All looks fine till now.

Duplex Price is hefty... Question is if you can mix the chain
My Cat has also a quite shallow depth locker and 45m of 10mm chain is fine and 1 year old but with another 40m that i need additionally and will be used most of th time the coning is a problem.
My Gypsy doesn't work with rope and there is non available in 10mm that does.
85m of duplex, no way i am not a millionaire.
But additional 40m that gets mostly used would be worth thinking about.

[Simi 60]

Originally Posted by CaptainRivet

How do you connect your anchor to the swivel or chain directly?
Cut one link open and directly connected the anker? If yes did you xray the weld?
Otherwise you need a SS shackle?

.

I use a rated galvanised Van Beest shackle to join our tested Galv chain to super high holding power Galv anchor

Well i already mixed for several years as the swivel is stainless as all of the good ones on a galvanized chain and anker. All looks fine till now

.

I won't do it
I anchor daily and am not risking my vessel or my good night sleep worrying about untested, unrated gear.
I won't use a swivel either.

[GRIT]

Originally Posted by thinwater

Grit: what is about galvinized chain that did not satisfy you? Corrosion? Piling? Appearance? Mud? Just curious.


One down side of SS chain, seldom mentioned and not relevant to you, is that it is slippery and thus harder to pull by hand. The corollary of why it cleans and piles better.

It looks like I missed responding to this question on the thread.

We have issues with piling. We're doing some tests on a few different methods, and will soon raise the windlass about 8 inches, which will help. We've tried a few tricks that worked great on our last two boats, but so far, we're still having issues.

I'm hoping raising the chain will work. The uncertainties of corrosion, and the ability to spot it in time, is keeping us from buying the stainless, for now.

Cheers.
Paul.