rigging SWL

[David Humphries]

Your Cs41 training provider (treevolution eg) will thoroughly go over this information with you.

 

http://www.treevolution.co.uk/courses/dismantling_techniques.php

 

 

 

 

 

 

 

 

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[Lancstree]

I haven't got the money to do that course too!

[Lancstree]

SWL = MBS/SF Is that correct?

[Ropey]

The British standard for synthetic fiber rope is 6-1 however SWL or design factors range from 5-1 to 12-1.

According to the cordage institute the SWL must be determined by the user and can be different depending on the type of material the ropes are made from.

 

I.e some of the new zero stretch ropes like Ocean 12 can have very low SWL as they do not retain any energy so if they fail they do not whip.

 

I think if it was me I would be working on a 10-1 to be safe and retiring any ropes that show any sign of damage.

[bob]

for how long this thread has been on i have been supprised by the lack of responses

however i am not shocked as the impreshion i get is that this is another thing that is not really bothered about.

I run my lowering ropes at a different swl to that of othere and would mark someone elses kit different.

i was looking into this and found guidlines ranging from 3-1 to 16-1 and even found the supplier for my latest rope giving a swl of 4-1 on there website

also i have a rigging software disc that seems to pass a safe system on 3-1.

how many of you even know the breaking strain never mind safe working load or impact forces, angle loading ect ect that affect your rope strengh

[Pete Mctree]

http://www.honeybros.com/index.php?app=gbu0&ns=prodshow&ref=HB94A&sid=nszzlam3hf71n15i8j685sp45ycm2n58

 

 

(Recomending a SWL of 4 to 1

 

7620 / 1950 = 3.9)

 

 

 

Hello Honey brothers , don't you think you should address current best practice or at least qualify and quantify your factors of safety ???????????

[TREELINE]

for how long this thread has been on i have been supprised by the lack of responses

however i am not shocked as the impreshion i get is that this is another thing that is not really bothered about.

I run my lowering ropes at a different swl to that of othere and would mark someone elses kit different.

i was looking into this and found guidlines ranging from 3-1 to 16-1 and even found the supplier for my latest rope giving a swl of 4-1 on there website

also i have a rigging software disc that seems to pass a safe system on 3-1.

how many of you even know the breaking strain never mind safe working load or impact forces, angle loading ect ect that affect your rope strengh

 

 

Personally i think NPTC training bears no relation to actual working experience and the hole Loler stuff is aimed at the blue polypropelene brigade. I've just had two 14mm ropes failed due to excessive wear (from my arb supplier whole sells rope!) disagreed with the result and used them all day knocking out a big syccy (although it was 90% top roped i admit). No worries and they're probs more 'worn' than the day before now. The strength of MarlowBraid is in the core not the outer so as long as the outer is intact and healthy and your're not pushing whats sensible i think experience counts for more than a piece of paper. Regarding angles etc is important but again the heavy stuff is often rigged off the stem so angle is no worry.

[Peter]

The strength of MarlowBraid is in the core not the outer

 

 

Are you sure?

 

It is unique among double braided ropes if this is the case.

 

Do you know what the manufacturer's estimated strength loss over three years is?

[Peter]

I've just had two 14mm ropes failed due to excessive wear (from my arb supplier whole sells rope!)

 

If you are concerned about a possible conflict of interests then why aren't you using an independent loler inspector?

[tokaloch]

http://www.samsonrope.com/site_files/Arborist_Catalog.pdf