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What classifies a rope as semi-static or static?
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USnavy


Mar 3, 2011, 11:28 PM
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What classifies a rope as semi-static or static?
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I once read that ropes below 5% static elongation are classified as semi-static and below 2.5% classified them as static. But I cant find that article anymore. Does anyone know what the full requirements are? It seems CE only has one certification for static ropes (EN 1891) but I cannot find a copy of EN 1891 so I cant read it to see if it divides static ropes into more than one category or not.


(This post was edited by USnavy on Mar 3, 2011, 11:39 PM)


JimTitt


Mar 4, 2011, 9:35 AM
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Re: [USnavy] What classifies a rope as semi-static or static? [In reply to]
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They are all semi-static these days, they must have enough stretch to protect FF1 falls.


binrat


Mar 5, 2011, 5:19 AM
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Re: [USnavy] What classifies a rope as semi-static or static? [In reply to]
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USnavy wrote:
I once read that ropes below 5% static elongation are classified as semi-static and below 2.5% classified them as static. But I cant find that article anymore. Does anyone know what the full requirements are? It seems CE only has one certification for static ropes (EN 1891) but I cannot find a copy of EN 1891 so I cant read it to see if it divides static ropes into more than one category or not.
I do believe that it orginally came form the Cordage Institute.


krigarn


May 11, 2011, 1:35 PM
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Re: [USnavy] What classifies a rope as semi-static or static? [In reply to]
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In the European standards there is only one type of static/semistatic rope. Named "Low stretch" ropes.
In this standard a few things is tested:
a fallfactor 0,3, with 100 kg, The impact force should be no higher than 6 kN
five falls, fallfactor 1, with 100 kg. the rope shall not break
the stretch, between a load of 50 kg and 150 kg should not bee more then 5%
static resistance of 22 kN, 15kN breaking strength with figure of eight terminations.
and some more...

There is two types of ropes within the EN 1891, A and B.
The B is a thinner/weaker rope. Dropptest and static test with 80 kg instead of 100 kg. breaking strength 12kN with figure eights, 18 kN without.

You cant get the standard if you dont by it, and it is not worth the money, 92.
http://shop.bsigroup.com/SearchResults/?q=en%201891


Partner cracklover


May 11, 2011, 2:51 PM
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Re: [JimTitt] What classifies a rope as semi-static or static? [In reply to]
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JimTitt wrote:
They are all semi-static these days, they must have enough stretch to protect FF1 falls.

Wait a minute, you're saying you can no longer get a real static line with a polyester, Kevlar, or equivalent core?

GO


JimTitt


May 12, 2011, 4:25 AM
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Re: [cracklover] What classifies a rope as semi-static or static? [In reply to]
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You can buy all sorts of rope, you can even buy steel bars and tie knots in them but the question was regarding static ropes to EN 1891.


rescueman


Jul 5, 2011, 12:35 PM
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Re: [USnavy] What classifies a rope as semi-static or static? [In reply to]
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Cordage Institute
static: <6% stretch @10% of breaking strength
low-stretch: 6-10% stretch @10% of breaking strength
dynamic: >10% stretch @10% of breaking strength

Static Kernmantle

CE std EN1891:
Elongation 5% Max when increasing from 50kg to 150 kg load.

NFPA 1983 (1995 edition):
min - 15% at 75% Breaking strength
max - 45% at 75% Breaking strength

Dynamic

CE std EN892:
Elongation 8% max at 80kg - single ropes (single strand of rope)
Elongation 10% max at 80kg - half ropes (single strand of rope)
Elongation 8% max at 80kg - half ropes (double strand of rope)


Note: UIAA spec. refers to CE spec.


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