ANSI question about static line

[Fairfield]

Does anyone know what the rule with ANSI states about using a static line while in a tree is? Was told you cant use a static line, but then in the same breath was told you can, but only for ascent. Reason was due to a fall not having any stretch. Correct me if I am wrong though, you can have a fall while making an ascent as well sooooooo...... Just is not making any sense to me.

 

[itterada]

ANSI z133 8.1.7 makes details about a maximum working elongation but not a minimum.

People use static lines for access lines all the time. Might not make the best working line, definitely not great for DdRT, but as far as I can tell it's not mandated one way or the other.

Edit:

"Arborist climbing lines shall have a minimum diameter of 1/2 Inch and be constructed from a synthetic fiber, with a minimum breaking strength of 5,400 pounds when new. Maximum working elongation shall not exceed 7 percent at a load of 540 pounds (2.402 kN). Arborist climbing lines shall be identified by the manufacturer as suitable for tree climbing."

and then the exception only denotes leniency of rope diameter.

 

[Fairfield]

So, kind of what I had thought. There is nothing stating that a static line "can't be used" while working in a tree.

 

[itterada]

If there is, I'm sure not seeing it. Don't take that for gospel though. Hopefully someone else will back it up or refute it.

 

[Tom Dunlap]

Something to remember...in DdRT the strength of two legs of the system is added together but the stretch is halved. That means that, say, a rope with 'X'k breaking strength and 'Y'% stretch in DdRT has '2X'k strength in the system but only '.5'% stretch...so...for all these years climbers have been using what is really a low stretch system in DdRT.

In SRT the numbers stay the same.

 

[Fairfield]

Thanks guys, I have been reading and finding the same thing. Just wanted to get a collective view on the reading.