Swaged Alloy Ferrules on Wire Rope Slings for subsea use
Swaged Alloy Ferrules on Wire Rope Slings for subsea use
(OP)
Generally for rigging used in subsea environments we used steel ferrules at the end terminations.
However, it is possible to use alloy ferrules but only if the wire rope is not submerged for any length of time. This is because the sea acts as an electrolyte turning the ferrule into an anode, causing it to corrode.
Does anyone have any guidance on how long it would take for the strength of the ferrule to be compromised? Has there been any research done on this subject?
Any thoughts or comments would be appreciated.
However, it is possible to use alloy ferrules but only if the wire rope is not submerged for any length of time. This is because the sea acts as an electrolyte turning the ferrule into an anode, causing it to corrode.
Does anyone have any guidance on how long it would take for the strength of the ferrule to be compromised? Has there been any research done on this subject?
Any thoughts or comments would be appreciated.





RE: Swaged Alloy Ferrules on Wire Rope Slings for subsea use
We generally use spelter sockets or the steel ferrules that you have mentioned unless the lift is a one off use such as lifting concrete diffuser domes into position.
Stephen Argles
Land & Marine
www.landandmarine.com
RE: Swaged Alloy Ferrules on Wire Rope Slings for subsea use
The job required the rigging to stay subsea for a short period of time so alloy ferrules may be suitable, albiet risky.
I dont know how long they can be left though, and thats the problem. Ideally we wouldnt touch alloy ferrules with a barge pole but the client has effectively tied our hands.
RE: Swaged Alloy Ferrules on Wire Rope Slings for subsea use
The worst is if the rigging is attached to a steel structure which the ferrules try to protect and then you loose the ferrule in a few days.
Have you time to change to spelters?
What about adding anodes?
Stephen Argles
Land & Marine
www.landandmarine.com