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Old 08-08-2016, 05:00   #1
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Rope selection

I'm working on the application for off-shore environment. There is a pulley system, were 1 pulley is at sea level. It means that during water level change it stays under the water. It means 12 hours above water, 12 under water. I don't have any experience with such environment, so I'd like to ask for some advise. The question is what sea makes with rope, sheave, bearings. Rope dia 6mm, sheave 80mm, pretension just man force. Are there any solutions known already? now as first idea I choose the Dyneema Dyneestar 605 rope and pulley with POM sheave just on stainless axis without bearing. I can make salt test to check corrosion resistance, but what about algae? Other issues?
Thanks for any advises, thoughts!

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Old 08-08-2016, 06:00   #2
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Re: Rope selection

Do anything you can to keep the block out of the water, I don't think the line will be your issue, yes crap will grow on it, but I've seen many a line submerged for long periods that doesn't seem weakened, looks like crap, but seems to retain it's strength.

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Old 08-08-2016, 06:13   #3
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Re: Rope selection

Greetings and welcome aboard the CF, Denys.
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"

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Old 08-08-2016, 06:39   #4
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Re: Rope selection

Yes your challenges will be corrosion and marine growth.

Marine growth does not like copper. Check if this material has use for you.

Corrosion does not affect synthetics and some metals do better than others.

UV will try to eat the components above water too.

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