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USnavy
Mar 4, 2011, 7:28 AM
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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 4, 2011, 7:39 AM)
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JimTitt
Mar 4, 2011, 5:35 PM
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They are all semi-static these days, they must have enough stretch to protect FF1 falls.
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binrat
Mar 5, 2011, 1:19 PM
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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.
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krigarn
May 11, 2011, 8:35 PM
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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
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JimTitt
May 12, 2011, 11:25 AM
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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.
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rescueman
Jul 5, 2011, 7:35 PM
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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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