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Material recommendation for lifting applications subsea

Material recommendation for lifting applications subsea

Material recommendation for lifting applications subsea


I'm looking for some suggestions for material for lifting applications subsea (max. 6 month submerged)

WLL = 1000tonns

I was thinking mooring chain steel qualities (R3, R3S, R4, R4S and R5), but would like to hear alternatives

Thank you!


RE: Material recommendation for lifting applications subsea

What other materials would you consider? 300 series stainless is subject to stress corrosion cracking. Everything else is too dang expensive.

RE: Material recommendation for lifting applications subsea

steel, lots of steel.
As TBE says, it is the only viable option.
Use good corrosion allowances and safety margins.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: Material recommendation for lifting applications subsea

Some alternatives would be to consider composites (e.g. carbon reinforced fibres) but the lack of understanding from offshore design engineers has resulted in very few utilisations in this industry compared to others with as much risk and expensive consequences.
So due to lack of track records, you won't get the authorities to sign in to your proposed alternative I am afraid.

* Finding a solution is great * Knowing how to implement it is fantastic * Believing it is the only one and best is naive ?

RE: Material recommendation for lifting applications subsea

Crowdsourcing is not an appropriate approach to designing subsea structures and equipment.
There are established industry practices and codes that apply; I suggest you start by familiarizing yourself with those.

"If you don't have time to do the job right the first time, when are you going to find time to repair it?"

RE: Material recommendation for lifting applications subsea

Your lifting scenario is far-too skimpy on configuration/size, designated lifting points, accessibility, sea depth, currents, genera sea water conditions [tropical, arctic, etc], expected marine-life attachments... etc...

Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]

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