Tirfor Type Winch, Strops/Straps and WLL

[R Mac]

Just thinking, if I go for the 1600kg winch it has a straight pull rating of 2500kg, if use a pulley as a redirect wouldn't I need at least 1 x 5 ton strop?

[felixthelogchopper]

 

Oh get a crap load of sheer pins too.

 

Thanks for the reminder to order some.

[SteveA]

I recently ordered a few things to go with my Tirfor TU16 (1600kg) winch....

 

- 2x 3000kg yellow straps (eyelet to eyelet) each at 3m length

- 1x Grade 80 10mm lifting/ choker chain with 'clevis forest hook' option, at 3m length..... see here: 10mm Single Leg Lifting Chain - Single Leg - Grade 80 Lifting Chains - Lifting Chains

 

You could get away with an 8mm choker chain and it would be lighter to carry - I just got the 10mm because I'll also be using it with machinery.

 

cheers, steve

[SteveA]

Just thinking, if I go for the 1600kg winch it has a straight pull rating of 2500kg, if use a pulley as a redirect wouldn't I need at least 1 x 5 ton strop?

 

I was looking at getting a 4t pulley with my setup but was warned that it can do the manual winch cable in.... so I didn't get one in the end.

Maybe the pulleys are okay to use once in a while?

cheers, steve

[Haironyourchest]

8000kg/8 ton Snatch Block (to gain a larger pulley size, still not X 18 the rope diameter sheave)

 

 

Those look to be off-road vehicle recovery pulleys - not rated for lifting, which is what all your other equipment is rated for. Bear in mind that the diameter of the groove of the pulley sheve is also important to the life of the rope - if the groove is too narrow, it will pinch the rope and if too wide the rope will want to flatten out - it should really be exactly sized so that it cradles and supports the rope. The D/d ratio is another bugger, as they don't make snatch blocks with he right ratio and also the right groove diameter - believe me I'v searched. The only way around this is to use a dyeema extension with the pulleys, as it has a higher tolerance for D/d. Or just don't worry about it and use the tirfor rope....

[R Mac]

8000kg/8 ton Snatch Block (to gain a larger pulley size, still not X 18 the rope diameter sheave)

 

 

Those look to be off-road vehicle recovery pulleys - not rated for lifting, which is what all your other equipment is rated for.

 

Not exactly, the 8 ton snatch block is certainly not designed for lifting but neither is the winch rated for lifting 2.5 ton, that's it's pull rating, the lifting rating is 1.6 ton.

 

To be honest I can't see many people using snatch blocks that in an attempt to get the correct diameter sheave weigh in at 25kg, as you say even if you get the appropriate diameter the groove is potentially too wide for the wire rope.

 

The pulleys listed on the link below are designed to be used with 'Cable Pulling Machines From All Manufacturers'

 

See Here

 

None of them fit the bill exactly.

 

I'm tempted to go for the 8 ton recovery snatch block to be honest. It's massively over the pull rating of the rest of the system the only concern is the potential negative effect that the smaller than recommended pulley diameter has on the wire rope.

[R Mac]

Ok, looking at the specification for a Tirfor T516 and recommended Pulley Blocks, information taken from

 

Lifting Equipment Specialist & Supplier | LiftingSafety

 

Tirfor T516

 

WLL Lifting Capacity - 1600kg

Wire rope Diameter - 11.5mm

 

Pulley Rating Required for 2.1 mechanical Advantage - 3200kg

 

Snatch Block Sheave for use with Tirfor Cable Pullers.

 

Pulley Block 3200, weight 15.5kg, £195

 

WLL Lifting Capacity - 3200kg

Wire rope Diameter - 15mm

Sheave Diameter - inner/outer - 180mm/220mm

 

Tirfor Recommended Wire Rope to Sheave Ratio - 18x Wire Rope Diameter,

 

11.5mm dia wire rope x 18 = 207mm

[R Mac]

Ok An Update,

 

I've ordered

 

ACE wire rope Puller, 1600kg lift/2500 pull

Shear Pins for above

1 x Duplex (eye to eye) 3m x 3000kg Sling

1 x Endless round 5m x 3000kg Sling

2 x 3.25 Ton Bow Shackles

 

That'll do for now but I'll probably add a 10 ton recovery snatch block, a 6 ton Bow Shackle and a 6000kg x 5m Endless round Sling at some point.

 

Thanks to those who contributed by offering advice/suggestions.

[SteveA]

Ok An Update,

 

I've ordered

 

ACE wire rope Puller, 1600kg lift/2500 pull

Shear Pins for above

1 x Duplex (eye to eye) 3m x 3000kg Sling

1 x Endless round 5m x 3000kg Sling

2 x 3.25 Ton Bow Shackles

 

That'll do for now but I'll probably add a 10 ton recovery snatch block, a 6 ton Bow Shackle and a 6000kg x 5m Endless round Sling at some point.

 

Thanks to those who contributed by offering advice/suggestions.

 

That'll do it.

What are you using the bow shackles for?

cheers, steve

[R Mac]

I'm was going to use the bow shackles to attach the winch to the strops but I could and probably will just attach the winch directly to the strops at least at the winch end. I hadn't really thought about the means of attachment until you asked but I suppose the endless loop sling might be a bit bulky to fit nicely to the winch attachment pin or the cable hook.

 

I'll know better when the stuff arrives.