Close Call: Rigging Point Failure

[Yimboob]

Thanks for sharing. Im a new climber (about 1 year of climbing) and i find i learn from miscalculations better than anything else. Even if it wasnt me i still can learn a little something. Especially when all the buzzin bees come in and give their thoughts. Thanks muggs you da man

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[poetmk]

Thanks for sharing - it takes courage to put a mistake like this for others to add their 2 cents. Most of the possible errors have been addressed by others - but I would like to add this - a Pinto pulley is NOT a rigging block/pulley. Period. Sure it's fine for a small branch here and there but not for what you used it for in the video And neither is the nylon strap/sling you are using. These are two things you should look into. Match your hardware for it's intended purpose - this will increase your safety factors.

peace,

Matthew

 

[colb]

Thanks for sharing - it takes courage to put a mistake like this for others to add their 2 cents. Most of the possible errors have been addressed by others - but I would like to add this - a Pinto pulley is NOT a rigging block/pulley. Period. Sure it's fine for a small branch here and there but not for what you used it for in the video And neither is the nylon strap/sling you are using. These are two things you should look into. Match your hardware for it's intended purpose - this will increase your safety factors.

peace,

Matthew

I think a pinto is acceptable in that terminal rigging conformation, if it hadn't busted out. The rope bend angle was not that extreme (until the rigging point lead broke...) and pintos are rated at 50 kn mbs.

 

[poetmk]

I think a pinto is acceptable in that terminal rigging conformation, if it hadn't busted out. The rope bend angle was not that extreme (until the rigging point lead broke...) and pintos are rated at 50 kn mbs.

Strength is just one factor. Bend ratio is another. Ask DMM if they designed the Pinto Pulley to be used with dynamic rigging loads. It's important, especially in a forum where inexperienced and new arborealists are looking for information to state facts sometimes. I'll check with DMM for their take on this.

Mk

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[colb]

Strength is just one factor. Bend ratio is another. Ask DMM if they designed the Pinto Pulley to be used with dynamic rigging loads. It's important, especially in a forum where inexperienced and new arborealists are looking for information to state facts sometimes. I'll check with DMM for their take on this.

Mk

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I hear what you're saying, and notice that TS (ahem, @bonner1040) doesn't list a SWL for the pinto, just a MBS... I look forward to hearing what you find out, or what someone else might already know. I don't personally have a pinto.

 

[southsoundtree]

I was wondering about that.

 

[CutHighnLetFly]

Wouldnt the bend radius not change what the pulley can do whether overhead rigging or negative rigging?

I've negative rigged with it, obviously within reason. But it has the same set up (bearings over bushings...or the other way around...) As a block.
And I gotta say, I'd put $$ on that webbing holding that rigging scenario anytime. Im judging from my toilet watching the video, so I'm not talking like it's fact. But I know I woulda had all the faith in the world in all hardware involved

 

[Muggs]

I have rigged with Pinto pulleys for 5 years now without a problem. I used the regular ones until they came out with the rigging version. I use them for pretty much all of my rigging except the heaviest wood. They are bomber and they help me to stay focused on the concept of Go Small AND Go Home. When I say small, I mean that I try to stay around 300-400 lb max, for almost everything, and even a bit smaller for tops.

I have 2 big CMI blocks that are rated for 25,000 pounds and they are really frigging heavy to haul up into the tree. Some people may need this kind of overkill, for instance, out on the west coast. But me, I really don't. I want the smallest hardware that will get the job done.

As far as the slings are concerned, those slings on the video are not just regular loop runners. They are double strength slings that work really nice in that application. They too are bomber.

"Increasing my safety factors" is precisely why I don't want the absolute heaviest rigging gear available. It's the same reason why I use a 1/2" rope instead of a 3/4" line. Just because 3/4" is stronger does not, to me, make it inherently safer. If it were, then we would all be recommending that everybody stop using 1/2" rigging lines altogether.

Yes, of course, people can use the biggest, strongest rigging gear possible and take pieces many times larger than my 400 lb max, and that's awesome, but I just prefer, most of the time, to keep it small. I have no interest in trying to convince anyone, other than my apprentice, that my opinion is more valid than anyone else's on this issue. I have enormous respect for everyone who does big rigging. I do it sometimes too, and when I do, I switch out my Pinto pulleys.

The video that I posted to get this conversation started is really only a small part of the story. For anyone looking for the full thing, you can read the article here:

http://www.educatedclimber.com/close-call-rigging-point-failure/

Peace.


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