Running rigging comes in many forms, from 3-strand nylon on cruising boats to single braid spectra on racing boats. What they all have in common is that they can suffer a decline in performance from wear, abrasion, heat and other factors.

One way to check your running rigging is by inspecting it visually. Frayed strands, broken yarns, and pulled strands are items to look for. If a rope has been heavily used it will become compacted or hard which can indicate a lessening in strength. While a visual inspection of your running rigging can't precisely determine remaining strength it can keep you apprised of the wear pattern of the item.

For rope such as 3 strand surface damage is a key indicator. If a line has a core under the cover is less susceptible to strength loss through surface damage.

When inspecting a rope here are signs to look for and their meaning. If the surface of a rope is extremely rough strength is being lost. If the surface of the cover has been reduced by 50% or more for a distance of 4 or more rope diameters you should consider replacement or using the rope in a lower load application. If you can see the core through the surface discard the rope.

If a rope shows pulled strands be aware that these can snag and cause problems during use. You should try to work these back into the rope to preserve the integrity.

A rope can be burned via friction when in use. If you see a melted or fused length longer than 4 rope diameters consider replacing the line.

If a rope has an eye splice in it there are several areas to look at. If there is abrasion at the female end of the splice (side that comes from the main rope) you should consider resplicing or discarding the rope. To protect the rest of the splice thimbles should be used when possible.

One way to prevent damage to your running rigging is to assure a smooth run. Check the masthead, and blocks to ensure rough edges don't exist. A good dousing with fresh water can help blocks, sheaves and fair leads run freely. Tape things like cotter pins and split rings to avoid damage such as pulled strands.

Inspect items that interface with your running rigging. Do your winches spin freely and feel smooth? If not consider having a winch service performed. Are cleats securely fastened to the deck? Do cam cleats work freely? If you have rope stoppers, do they hold?

Be aware that like other items on your boat rope can be degraded by exposure to sunlight. Perhaps think about removing sheet lines between sails to get them out of the sun.