Insulating rigging rings

[Sgriff]

View attachment 33692

Retrevible rigging sling made with Amsteel and steel rings

this is the same idea right? Wonder if he has had any issues.

 

[Nish]

Here's the kind of rings and configuration I've been using. It's adjustable, retrievable, and runs the rigging line through three rings.

 

[jmcscrap]

Just my thought on this, but wouldn't your groundies hands start to burn before the rings get too hot? Even a good leather glove heats up inside pretty quick.

 

[Nish]

Just my thought on this, but wouldn't your groundies hands start to burn before the rings get too hot? Even a good leather glove heats up inside pretty quick.

Given the smoothness of the rings, that does seem likely. If the friction device were between the load and the rings, then it would be much likelier still. But, leaving the friction device where it typically goes, the load on the rings is a whole lot greater than the load on the hands.

 

[RajElectric]

Using one ring, I can see some heat, but perhaps 3 might not heat up?

 

[Nish]

Using one ring, I can see some heat, but perhaps 3 might not heat up?

I expect a single ring would heat up a lot more, given the increased load on it, the increased area of contact with the rigging line, the lower potential for heat dissipation. But I just don't know how to calculate the decrease in heat-per-ring as rings are added.

 

[monkeylove]

It would be about a 27 page equation with hundreds of variables. Just get a heat gun and go play. Write it all down and in no time you will have an actual usable knowledge of your rigging processes. Way better than equations.

 

[southsoundtree]

Doesn't the sling serve as a partial heat sink. Convection, conduction, and radiation are where the heat goes. You're cutting out conduction.

Is is right that the slings lose strength BEFORE they melt? Melting is a sign you've gone over the line, but where is the line?

 

[Sgriff]

http://www.pelicanrope.com/pdfs/DyneemaSK75_Tech_Sheet.pdf

"Temperature.
Dyneema[emoji768] fiber has a melting point between 144C and 152C. The tenacity and modulus decrease at higher temperatures but increase at sub-zero temperatures. There is no brittle point found as low as -150C, so the fiber can be used between this temperature and 70C. Brief exposure to higher temperatures will not cause any serious loss of properties."