SRT/Rope Wrench Safety Advice

[Youngbuck20]

There's a guy on YouTube called Ontarioclimber, he has lots of videos with the rope wrench, worth watching.

 

[Carburetorless]

And carb-less -- you would be correct with the assumption that the rope is bent at 180 to the extent that it has been pinched; HOWEVER, it can be safely used during 180 degree turn, provided that the bend ratio is 4:1, that is, the bend occurs at a place (like in a properly selected pulley, or even a branch) if the turn provides at least the prescibed bend ratio.

I never said it wouldn't be safe, I only said it's weaker than if it were being pulled straighter. The smaller the radios the less rope holding the load.

Any time you put a bend on a rope the rope's strength is lowered for the duration of the load due to the fact that there is less of the rope's diameter holding the load.

4:1 and it's safe? Only if you stay within safe working loads, but just because a rope is rated at WLL: 810 doesn't mean you can put an 810 lb guy on the line. So you'd better use two ropes Ius.

 

[VA-Sawyer]

Clueless Carb,

What you said was a 180 degree bend made a rope 1/2 as strong. You didn't just say weaker, you said it loses 1/2 of its strength. Just page up and read your own BS ! Just curious, do you also put cement in tee cavities ?

Rick

 

[VA-Sawyer]

4:1 and it's safe? Only if you stay within safe working loads, but just because a rope is rated at WLL: 810 doesn't mean you can put an 810 lb guy on the line. So you'd better use two ropes Ius.

Wrong again CC. WLL means that you can put a 810 lb guy on the line and be safe. You need to understand that WLL includes a safety factor that puts the limit well below the breaking strength of the rope. I have to say that Clueless fits you to a T.

Rick

 

[Iustinian]

Technically -- we should all use two ropes according to ANSI; your work positioning/access line (depending on your climbing style) and an additional access line, in case the need for an aerial rescue arises -- makes for a faster safer rescue, assuming that you've performed an online test of the access line.

Sawyer is correct again -- WLL is a factor. Working Load Limit is generally accepted to be 10% of the maximum break strength, assumed that there are no structural defects in the line.

It is of note to mention that weight measured in pounds by itself is a crude and poor way to translate Kilo-newtons, by the way, when you understand that a kilo-Newton is a measure of force, and weight measured in pounds is strictly a measurement of gravity -- which is a concept deserving several hours of study in and of itself.

Anyhow -- generally accepted that our gear (ropes, harnesses, connectors) is to be rated at 5000 LBS, or roughly 23 kN. that is a WLL of 500 lbs, everyday use, accepted and endorsed by professionals internationally and no problem w/ ANSI and OSHA.

OSHA requires fall protection systems on any work that is performed on a surface that is over 4ft from the ground. You show me the last 500 lbs employee (having roughly a factor of 2.2 kN, which I'm just being a smartass at this point) that has performed treework on a surface over 4 ft from the ground "with or without reasonable accommodation" hahahaha (ADA, right?)

810lbs? that's like 4 whole climbers -- and what's crazy is -- that's the safe WLL of more than one climbline on the market today. Bluestreak specifically, which has a MBS of 8,100lbs

Carb, you said "Any time you put a bend on a rope the rope's strength is lowered for the duration of the load due to the fact that there is less of the rope's diameter holding the load." you are incorrect when you say ANYTIME. if the bend is made around a surface (AGAIN, like a pulley or even a branch) that provides at least a 4:1 bend ratio, there is no pinch, there is no loss of performance. Some rope manufacturers ask for a higher/lower bend ratio, depending on the particular application/use.

Pin termination is usually accepted to be less.

(360)384-4669 Samson Rope
(207) 282-3396 Yale Rope

Call and ask, they'll usually be willing to talk to you and explain it.


No BS I've talked to them personally, and even the guy at Sherill that does most of the splicing. What takes me 2 hrs takes him like 15 minutes. less now probably.

Study up -- its interesting stuff if you have the time, and your life depends on it.

 

[sgreanbeans]

Dinked Carb for unsafe info.

 

[ClimbMIT]

Technically -- we should all use two ropes according to ANSI; your work positioning/access line (depending on your climbing style) and an additional access line, in case the need for an aerial rescue arises -- makes for a faster safer rescue, assuming that you've performed an online test of the access line.

Sawyer is correct again -- WLL is a factor. Working Load Limit is generally accepted to be 10% of the maximum break strength, assumed that there are no structural defects in the line.

It is of note to mention that weight measured in pounds by itself is a crude and poor way to translate Kilo-newtons, by the way, when you understand that a kilo-Newton is a measure of force, and weight measured in pounds is strictly a measurement of gravity -- which is a concept deserving several hours of study in and of itself.

Anyhow -- generally accepted that our gear (ropes, harnesses, connectors) is to be rated at 5000 LBS, or roughly 23 kN. that is a WLL of 500 lbs, everyday use, accepted and endorsed by professionals internationally and no problem w/ ANSI and OSHA.

OSHA requires fall protection systems on any work that is performed on a surface that is over 4ft from the ground. You show me the last 500 lbs employee (having roughly a factor of 2.2 kN, which I'm just being a smartass at this point) that has performed treework on a surface over 4 ft from the ground "with or without reasonable accommodation" hahahaha (ADA, right?)

810lbs? that's like 4 whole climbers -- and what's crazy is -- that's the safe WLL of more than one climbline on the market today. Bluestreak specifically, which has a MBS of 8,100lbs

Carb, you said "Any time you put a bend on a rope the rope's strength is lowered for the duration of the load due to the fact that there is less of the rope's diameter holding the load." you are incorrect when you say ANYTIME. if the bend is made around a surface (AGAIN, like a pulley or even a branch) that provides at least a 4:1 bend ratio, there is no pinch, there is no loss of performance. Some rope manufacturers ask for a higher/lower bend ratio, depending on the particular application/use.

Pin termination is usually accepted to be less.

(360)384-4669 Samson Rope
(207) 282-3396 Yale Rope

Call and ask, they'll usually be willing to talk to you and explain it.


No BS I've talked to them personally, and even the guy at Sherill that does most of the splicing. What takes me 2 hrs takes him like 15 minutes. less now probably.

Study up -- its interesting stuff if you have the time, and your life depends on it.

Now I am learning something. Good info. Thanks

 

[Carburetorless]

Clueless Carb,

What you said was a 180 degree bend made a rope 1/2 as strong. You didn't just say weaker, you said it loses 1/2 of its strength. Just page up and read your own BS ! Just curious, do you also put cement in tee cavities ?

Rick

Now you're splitting hairs; Stop being a keyboard jockey.

 

[Carburetorless]

Wrong again CC. WLL means that you can put a 810 lb guy on the line and be safe. You need to understand that WLL includes a safety factor that puts the limit well below the breaking strength of the rope. I have to say that Clueless fits you to a T.

Rick

Bla, bla, bla bla bla.

 

[Carburetorless]

Dinked Carb for unsafe info.

You didn't dink me did you? Did you? Did you dink me? Seriously man; Did you dink me??

 

[VA-Sawyer]

The point is splitting hairs can be the difference between living and not living.
You got dinked for spreading bad info, and that is why I started on your case to begin with.
You need to do more learning before you start trying to tell others how things are. I will be keeping on you every time you say something WRONG !
Rick

 

[Carburetorless]

The point is splitting hairs can be the difference between living and not living.
You got dinked for spreading bad info, and that is why I started on your case to begin with.
You need to do more learning before you start trying to tell others how things are. I will be keeping on you every time you say something WRONG !
Rick

Gosh, now I feel special. :msp_thumbup:

Anyway,

Since I'm a newb and all; What does "dinked" mean?

 

[Carburetorless]

Palm of the hand to forehead.

You changed your reply. I'm glad I didn't reply before, that would have be awkward.

 

[Carburetorless]

Giving out advice that has to be corrected would make most feel awkward.

I need to get one of those ignore list apps.

 

[tree md]

Ignorance is bliss.