Industrial ropes rigging and rescue
I spent a week as happy as a pig in mud doing an industrial ropes rigging and rescue course. I love gear and playing with that gear is even better.
Cameron is swinging around out there on the pointy end. He`s hanging off an SRTE Ozpod. This device is used for creating a high anchor. The really good thing about an Ozpod is that it can be luffed back while under load. This means that we could leave Cameron attached where he is and using the luffing mechanism on the frame bring him inboard and sit him on the ground between the legs of the frame without having to touch any of the ropes.
This pic shows one way of attaching and adjusting the guy ropes to the main anchor head of the tripod/Ozpod. This is a very easy and quick method of setting anchors. This adjustable sling ropes breaking strain is 1800kgs. The weakest point in this guy rope setup is the cam on the ascender. The cam will shred the sheath of the rope at aprox 900kgs thus with the rope forming a continuous loop going to and from the anchor head and through a biner at the tree anchor behind the photographer we can double the 900kgs to 1800 kgs.
This pic shows another guy rope setup and believe it or not it is only half as strong as the last setup. The weakest link in this setup is the cam on the ascender which will shred the sheath at 900kgs. Note that these SRT ascenders will not cut the rope merely shred the sheath thus reducing the rope strength by 30 percent.
We also should discuss the various other ropes attached to the anchor head of this frame. From right to left we have the guy rope as discussed and then a yellow fixed rope, then a black rope set up as a redirection and then an orange rope set up as a rebelayed rope. Then at the far left end of the anchor head is the other guy rope setup. We`ll take a closer look at Cam and his personal gear setup shortly.
Here we have Cameron modelling the latest and safest pice of equipment available in the market for industrial and rescue ropework. He is demonstrating an SRT No Worries descender in the locked off position complete with backup ascender which is clipped to a completely seperate rope which in turn is entirely anchored seperately. The backup ascender is attached to his harness via a shockload limiting device or shock absorber Kong KISA
This pic demonstrates the SRT No Worries descender being used as a belay device and shock absorber. The No Worries will allow rope to slide through the device if a shock load of around 800kgs is applied and no damage to the rope is evidenced. Thus forces transmitted to the anchors are minimised.
You will also notice part of the luffing mechanism of the Oz Pod.
Grant is about to start hauling using an SRT Trachaul 7to1 jigger. These jiggers are awesome and come complete with a very small prussik setup so that the rope within the haul system is immediately held upon relaxing the hand off the haul cord of the jigger. We have our setup ready to haul Cameron up the rope now and as Grant hauls on the jigger another person will pull rope through the SRT No Worries belay and descender device.
This is only a small portion of the first days effort we put in. We also played around with the course instructors vast collection of failed and tested gear discussing the various ways that gear and rope fails and the consequences to the person using that gear. There are some scary practices out there folks.
One instance of which I can relate. Multi story window washer setting up his ropes to go over the side of a parapet uses only one 25kg weight to anchor his abseil rope and heads over. He is merely relying on that one counterbalanced weight to hold him from doom plus the friction of the rope going up and over the edge of the parapet. This does nothing for the man if he should ever generate any shock load in the system, we have a contender for the darwin awards methinks.
As I sort out more pics I will throw them together here if anyone is interested. We`ll see what sort of reaction this article receives before I commit to doing too much more in the industrial and rescue ropes scene here on rc.com.