Cycles to failure

[cheesmanator]

Evening all,

 

Was wondering about this subject today during a conversation while eating some scran.

 

The question is, is the equation for cycles to failure and in fact the whole principle, would this be applicable to your metal equipment? My understanding is that the CtF is only applied to textile items. I have checked in a couple of books, TCIA Rigging and the ISA principles of rigging, the only reference to CtF is with regards to ropes and slings.

 

Also, want other peoples input here, do you class yourself as a tree surgeon or an Arborist? in my mind they are one and the same. if there is a difference please elaborate....

 

Many Thanks

[Craig Johnson]

everything does have CtF just with textiles in rigging its much shorter than your hard ware!

 

as for the other, see don blair's book, me oak man

[cheesmanator]

everything does have CtF just with textiles in rigging its much shorter than your hard ware!

 

as for the other, see don blair's book, me oak man

 

So if you did ever need to, how would you work out the CtF for pulleys, blocks and krabs? And would it be necessary as the rope is the weakest part of the system?

 

Also had a search for me oak man, don blair and couldnt find a hit. Came up with a euc and an oak... or similar title.

[Peter]

As with textiles, sticking to the swl and sf will give a long service life, and mean the item should wear our before ctf ever becomes an issue.

 

Calculating ctf under normal circumstances is pointless, it's either many many ctf or if the swl is exceeded and the item is damaged then it should be retired ASAP.

[cheesmanator]

As with textiles, sticking to the swl and sf will give a long service life, and mean the item should wear our before ctf ever becomes an issue.

 

Calculating ctf under normal circumstances is pointless, it's either many many ctf or if the swl is exceeded and the item is damaged then it should be retired ASAP.

 

Cheers for that Peter, thats made it crystal clear for me. Also makes the first few paragraphs of section 8 in HSE rigging report understandable.

 

Also, I think we have one of your tipper units on our Ranger, one with chequerboard closing tops. Brilliant bit of kit.

 

Thanks again

[Peter]

Glad to hear it, on both counts!