r/Rigging

My workplace have introduced a new way to lift some of our dewatering pump units. The current lift points do not lift safely so they’ve come up with an idea like this.

The blue box is the beam, red circle is a chain sling green line is another chain sling hooked on to the crane. See 2nd picture for the beam.

It is not a rated or engineered lifting point from my knowledge.

The unit they’re using this lift for weighs 6-6.5T

LR11350 Mammoet

420.000 KG

So I thru- bolted 2 5ft unistrut to each Z purlin and 6” baseplate with 1/2” hardware. A 5ft unistrut connects the baseplate on each purlin and the 1300 lb hoist is bolted to the connecting unistrut. Harbor Freight load leveler is rated at 2 tons. Yellow lifting slings are rated at 6400 lbs each. Slings are attached to the load leveler with 3/16 quick links rated at 615 lbs each (think these are my weakest link). Then the black ratchet straps are rated at 1000 lbs each and hooked to the unistrut at the widest bolting point. One strap is hooked to the top unistrut and the other is hooked to the lower unistrut. The load is less than 250 lbs (tent weight 176 lbs and the bed rack weighs 55 lbs) I plan to leave the tent hanging till next winter camping season and pull it yearly. I also store a vehicle under it full time. Is this safe and if not please advise what to change.

I am hanging a swing chair from a tree branch with nylon webbing. Does a loop configuration double the rated strength? For example, if it's rated for 300lbs working load, would arranging it in a loop like the left side drawing make it effectively rated 600lbs? (I also realize that knots can also affect the load rating.)

Edit: I added a picture of the webbing in a comment. I don't know the actual rated strength, but any thoughts are welcome.

Edit 2: This page seems to explain why the loop, or sling setup, is indeed stronger than a single line.

https://overtheedgerescue.com/canyoning/sling-strength-vs-single-strand/

Hello all! We are thinking of recreating this setup for a kind of slider with maybe a stepper motor and belt drive? This mechanism is used by concertlab studio, it moves the camera on a track allowing it to swing overhead. Was thinking of DIY ways of engineer something similar?

One final destruction compilation before we switch things up this week. SLS hooks, master rings, snatch blocks, tie-down chain compared to Grade 100 chain — all showing very different spectacles of destruction.

You can see the hardware stretching, bending, and permanently deforming before it finally lets go. It’s especially interesting how little give the Grade 70 chain has compared to the Grade 100.

This is exactly why ductile failure is generally safer than brittle failure it gives you visible warning before the break.

Always interesting to watch how different pieces behave right at the limit.

#Destruction #HeavyDuty #Safety #Rigging #Compilation

This one’s a clipped destruction compilation. Wire rope, hammer locks, block shivs, straps, shackles, tie down chain, and more. Pure destruction. Pure fun. Pure love of the game.
Next week we’re going hard on Tie Down vs Lifting Chain and Wire Rope. Should be a good one.
What’s your favorite thing to watch get absolutely cooked? Drop it below.

#Rigging #Destruction #HeavyDuty #Wire #Chain

Hi folks, not sure if this is the best forum but I hope you can help. I am looking for good quality 6-8mm natural fibre rope. I am a scout leader looking to replace all my troop's rope. Most of it is low quality, like the 6mm rope on the left. On the right is an old piece of 8mm that is still in fantastic condition, soft and strong. It gets regular use, wet and dry, resists mold and is at least 15 years old.

Is anyone aware of any local (or international) suppliers of good quality natural fibre rope?

Everybody was too busy today to get more than just these glimpses of the tree. Though it was still a good day.

I currently have an I beam trolley with a chain hoist attached to it like in photo 1. I purchased an electric hoist but an unsure how to mount it. It came with brackets to use with a monorail and when searching I found this trolley that I think would work with the hoist but could only find a photo, no reliable sources to purchase.

Am I missing something? I find it hard to believe there isn’t a solution for this and that I just don’t know the right keyword to search for. TIA

I know this branch is kind of high up but it wont be for like a normal swing, it'll be fire the net swing pictured but no idea what I use to actually connect it to the tree

We have three or four lines that are making this kind of shhhhhhing sound while the rest are quiet. It's a bit more high pitched than the video makes it out to be, and varies in loudness depending on the line.

Our rail is about 20 years old. (Built in early 2000s)