Thanks Ted, very informative,
Regards,

@ Matty
Initial anchor chains are manufactured to specification. The classification society will then test a portion of the
chain, breaking strength in special, but not only that, also how it reacts under torsion for example. If the chain meets the standard, a certificate is issued, which is good for all chains made to that specification. Which means that not all chains on a ship are tested before using, but there is only a general test certificate for the procedure how the chain is made. Now and then, the manufactured chains and random tested again. But, NOT ALL chains on a ship are tested, just made to the test specification.
To the rust, does not say much about the state of the chain. Most anchor chains are rusty after 2-3 years in service. special if not used at all or seldom. You can imagine when a chain lays in a chain locker, moist air, salt residues from the saltwater, and protective paint only a slim coat when installed. The rust of a bigger size chain can be substantial over time, but does not necessarly say much about the quality and state of the chain.
As for this one,,the vessel is from the 70,s. most probably in the last years (don,t know even if this vessel is still afloat) not much maintained anymore. But for this age vessel, not unusual at all. I saw this one last in Callao, Peru anchorage, there are plenty of older vessels and most of them never will go anywhere anymore but will be cut to pieces at anchor and then hauled on a beach section at some point and that,s then about it for that vessel.

How is anchor chain stress tested?
Asking because that chain looks fairly rusted.