Reduce Overheating In Your Docklines and Rodes
But what percentage of a rope’s breaking durability is considered an “extreme” weight? And exactly how does the regularity of the load cycling impact heat build-up? And most importantly, how can we prevent this specific intra-fiber heat buildup from happening?
In the end, our testers discovered that although intra-fiber friction is actually a genuine risk, the more problematic threat is our apparent adversary– exterior friction caused by rubbing on chocks, anchor rollers, docks, fairleads etc. And the risk of interior friction on smaller sized diameter ropes is much less likely than it is on bigger diameter ropes.
Ropes greater than one-inch in diameter are subject to interior heating if packed past their safe working limit or loaded at high frequency. Ground anchor and sea anchor rodes are cycled at low frequency; though the core will see some increase in temperature level, it will definitely not progress to the point of compromising the rope unless the rope is packed past the 10:1 safe working limitation. If the anchor rode is sized right, it will never be over-strained or overheated.
Might interior friction have caused Golden Globe racer Susan Goodall’s drogue to part, a breakdown that added to her boat’s dismasting? Even though external friction is the most likely reason for failing in drogue or sea anchor lines, the loads enforced on a sea anchor rode can produce sufficient internal heat to trigger malfunction.
Dock lines are more serious issue. If the boat is subjected to short-period chop from the side, the regularity can be high and the pressure can exceed the 10:1 safe functioning limitation. Core temperature levels above the boiling point are feasible in dry conditions, and even with spray to cool the rope there certainly might be significant deterioration. Add to this significant frictional heating at connection points and special safety measures are required.
So what can a sailor do? Our specialists developed five easy measures to take to prevent heat build up in your dock lines and rode.
– Anti-chafe equipment type. Stay clear of waterproof materials. Select materials that are inherently slippery, such as nylon webbing.
– Anti-chafe gear positioning. Stay clear of sharp turns because these increase friction. Often poor cleat positioning can easily lead to extreme bends at a hawse hole or chock. Our evaluation of deck cleats on typical production boatsrevealed a variety of major problems.
– Reduce the run. Reducing the distance in between the anchor point and the friction point will decrease the back-and-forth movement that will escalate friction. Polyester or Dyneema pendants through the chock will combat friction here.
– Prevent slack lines and bouncing. In a recent article on storm preparation we discussed motion control. A boat that is bouncing on its lines escalates chafe, frictional heating, and forces.
– Choose the appropriate size. When truly serious weather is actually expected, seafarers like to double up lines and set up oversize lines, but the average watercraft does not possess cleats big enough to accommodate the required dock line size. We have taken to setting up strong Dyneema loops over the cleats in order to enable attaching multiple large lines to a standard cleat.
Raritan’s Marine Products Legacy
For more than fifty years, Raritan has been meeting our customers’ needs for outstanding service and product reliability establishing ourselves as “the most dependable name on the water.” Our customers continue to be our focus, and the primary source of the ideas for our new marine products and product enhancements. The median length of service for Raritan employees is about twenty years, an unusual number in the fast-changing world we live and work in. It is a measure of the dedication of the men and women who design, manufacture, distribute and support Raritan’s marine products. Visit our website today for the best quality marine sanitation products in the marine sanitation industry.
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Contact Person: Kimberly Carrell
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