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Re: 35 year old standing rigging - but rigger says it's ok
If you look at how a cable is rigged to a crane you'll notice that every connection is open.You can instantly tell when it begins to fail. Most states require that cranes undergo some type of inspection on a regular basis. I know a guy that worked at Bethlehem Steel Company in Baltimore and he said state inspectors were there at least once a month doing safety checks on heavy equipment. Same was true at Sparrows Point Shipyards.
My swage fitting on my 27 Catalina's forestay covered a completely severed cable. There was no rust, no indication that anything was wrong, and just prior to the forestay's failure we were sailing in 20-knot winds with a full jib on a beam reach. Within seconds of furling in the jib the 1/4-inch stainless cable parted inside the lower swage fitting and the jib-sail, roller furling system, etc... slid into the waters of Chesapeake Bay's upper reaches. Quick thinking and lots of luck resulted in being able to salvage the sail and system before any serious damage occurred. The sail and roller furler were lashed to the lifelines, the old jib halyard was quickly utilized to stabilize the mast to the bow, the main was folded up and secured and the engine was fired up and we were headed back to the marina - hoping no other rigging would fail during the 4-hour trip.
The rigging had been inspected by a certified and very reputable marine surveyor just a year prior to the forestay failure. The surveyor said "There's really no way of determining whether or not the rigging is OK. Without some very expensive X-ray equipment, there's no way of seeing inside the fittings, so they could be OK, or ready to fall apart and no one could determine which is the case." He did, however, suggest that the rigging be replaced because it was 30 years old and original equipment. He was right!
As my privious post show. There is a lot of rigging equipment that uses swage type fittings (chokers for example- which cranes typically attach to to lift equipment) and they are inspected reguarly, but they are not disposed of bast on an age. The other thing, if sailboat rigging cannot be inspected and cetified 100% that it is good for service, seems we got a problem. Either we use a different material (galvanized or bronze wire) or we have additional stays and shrouds to act as back ups. Seems we put a lot of faith into a single piece of wire that even an experienced rigging inspector cannot tell you "this wire is good for 25,000 miles of 25 knot sailing". When you get an industrial crane inspected they do not use x-ray, yet the inspection is assumed 100% reliable and in fact we do not have many crane failures if the inspections are done properly.
Last edited by casey1999; 09-25-2012 at 03:12 PM.