Ok all DMM reached back out. As I explained, I told them for our applications the screamer (rip stop) would see a continuous load of 300 lbs or less. And the estimated forces from a 1.5:1 fall factor on a static line are 4kN to over 9kN. I asked her if the ripstop would work for this application and also as a primary method of lanyard attachment and here was her response:
“Thanks for getting in touch.
The ripstop has actually been discontinued so this is possibly a moot point anyway but for interest and your research purposes.
I think the ripstop is not the right product for your application.
The ripstop was designed to absorb the shock loaded on the gear placement in ice, to protect the placement and not to shock absorb the force to the load (person) in a fall.
The sling is fully deployed (i.e. extended) at a load of between 3.1-3.4 kN, following this the sling is rated at 22 kN when loaded longitudinally when new.
Typical test results:-
- To deploy = 3.3, 3.3, 3.1 kN
- Sling strength (extended) = 29.3, 27.9, 28.0 kN (rated 22 kN)
1 kN = approx.102 kg
So loading the sling at all times is not going to be a good idea, even a small dynamic movement such as a bounce could deploy the sling.
The forces you are enquiring about are high- really high! Even some of the worse factor 2 falls on climbing equipment would expect to generate around 6-7kN and one would expect some injury from experiencing this type of force.
A person experiencing forces of 9kN would have serious consequences.
You should look into some shock absorbers used for work at height, they maybe more suitable but remember that you need to ensure the clearance takes into account the maximum length when the whole system is deployed.
Some reading you may find useful has been published by Petzl here:
https://www.petzl.com/INT/en/Profes...rk-at-height?ActivityName=Energy-and-networks
Best wishes
Holly Lindop
Customer Services
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DMM International Ltd.
Llanberis, Gwynedd, LL55 4EL”
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