When buying coated lifelines, If it's advertised as 1/4", is the cable itself 1/4" or is the cable and the coating 1/4"?
Dave
Dave
None yet but, if it ever happens, I'll be glad that they are all wire instead of smaller wire with plastic around it.How many times have your lifelines been used to the point that they would be saving your life?
Dave if your 300 pound body gets accelerated to 60 MPH in 9 feet across a deck you will already be in trouble even if you pass under the lifeline or more likely over them.I don't understand about the crevice corrosion that you are talking about. My coated lifelines are original on my 1983 H30 and are still solid. Almost every boat manufactured since the 60's has coated lifelines on it. Even the new boats. They seem to last for at least a couple of decades. How much more life do you expect to get out of a set of lifelines? If you had un-coated lifelines that you knew were 25 years old would you trust them?
The only real reason I can figure out to use un-coated wire for lifelines would be to gain wire size for strength. Everything else seems to really be blown out of proportion.
A couple of questions for Roger......How many times have your lifelines been used to the point that they would be saving your life? and How many lifelines have you seen that have broken? The way I see it, If my 300 lb body gets hurled across the deck at 60 miles an hour, It's going to take out more than the lifelines.
Dave
Stu, they sell 450,000 dollar houses with 30 year mortgages with 10 year wall to wall carpet. You don't finish paying for that carpet for 20 years after it is gone.Logic: If you had a choice of buying something that you thought would last 20 to 25 years or more, would you buy a covering that was guaranteed to make it look like crap in two?
I don't understand about the crevice corrosion that you are talking about. My coated lifelines are original on my 1983 H30 and are still solid. Almost every boat manufactured since the 60's has coated lifelines on it. Even the new boats. They seem to last for at least a couple of decades. How much more life do you expect to get out of a set of lifelines? If you had un-coated lifelines that you knew were 25 years old would you trust them?
The only real reason I can figure out to use un-coated wire for lifelines would be to gain wire size for strength. Everything else seems to really be blown out of proportion.
Dave, some answers:
I would defnintely not consider these concerns 'blown out of proportion'. What's out of proportion is many people's trust in a product that, in its newest incarnations, is not anywhere as good as it once was.
Crevice-crack corrosion is what happens to stainless steel when it is allowed to hold water without access to oxygen. Pull out 25-year-old SS screws from inside woodwork and examine the rust spots, and you'll see. The washers on my keel bolts are 18-8 SS and are 4 years old. They are a little brown now. (Should have used 316 SS.)
Most SS lifelines in the last 20-25 years have been 304 grade, which compares to 18-8 in corrosion resistance. The ORC specifies 316 which is what rigging wire should be. Also, the older coated lifelines are 7x7 which has many more crevices to collect water than does 1x19; and it is less strong and more prone to splintering (getting frizzy burrs).
Dave, in my 35-odd years in the boating business I have seen PLENTY of corroded stainless steel-- lifelines, fasteners, keel bolts, chainplates, etc. Almost all of it happens out of your sight and out of the air. The plastic coating on the undersized lifeline wire is a prime facilitator for it. Quite possibly a lot of the very old stuff was 316 SS. Almost none of the newer stuff is. I wouldn't trust the new stuff on the boat after about 8-10 years; that's a careful and professional opinion.
Have you peeled back the white casing on your 1983 lifelines (about 12-15" back from an end) and examined the wire? I would say it is black going on brown. If not, maybe it is 316 (your boat's vintage is about when I would begin to doubt it). But when you replace it, be sure to get 316 or the newer stuff won't last long at all, nowhere near as long as the older stuff did.
I would trust 25-year-old 1x19 wire rope that I knew to be 316 SS over anything I wasn't sure of, coated or not. I believe it'd be wise of you to replace them by now; but if you do, please consider the ocean-racing spec which will suffice for anyone sincerely concerned about safety, since it was specified as such for a reason.