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Old 09-25-2012
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Re: 35 year old standing rigging - but rigger says it's ok

Originally Posted by davidpm View Post
Is it true that cranes, hoists etc use regular steel. If so the difference may be that stainless behaves differently.

Another difference is on boats we use the swage fittings that can hide flaws that can't be inspected.

Another difference might be getting a regular saltwater bath.

I would also be interested in the engineering safety factors used. Is it higher on the crane?
Where I work some lifting cables are stainless. I have spoken with rigging inspectors and they tell me the inspection requirements are the same for stainless as carbon steel- look for individual broken strands.

Crane safety factor is about 4 to 1, about the same as a sail boat.

Industrial lifting gear does use a swage type fitting. These are used mainly for lifting chokers but are found on all types of lifting equipment. Here are some pics:
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Last edited by casey1999; 09-25-2012 at 01:34 PM.
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