Specifications for Protective Equipments for Sports — Part 1: Dynamic Mountaineering Ropes
1 Scope
This part of GB/T 23268 specifies the terms and definitions, requirements, test methods and instructions for use of dynamic mountaineering ropes.
This part is applicable to the dynamic mountaineering ropes used in mountaineering and outdoor sports.
2 Normative References
The following documents contain provisions which, through reference in this part of GB/T 23268, constitute provisions of this part. For dated references, subsequent amendments to (excluding corrections), or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document applies.
GB 5296.7 Instructions for use of products of consumer interest — Part 7: Sports equipment
3 Terms and Definitions
For the purposes of this part, the following terms and definitions apply.
3.1
dynamic mountaineering rope
rope with a certain elasticity, which is capable of reducing the impact and absorb falling energy, used in mountaineering and outdoor sports
3.2
single rope
dynamic mountaineering rope, capable of being used singly to arrest a person's fall
3.3
half rope
dynamic mountaineering rope, which is capable, when used in pairs, to arrest the leader's fall, see Figure 1
Figure 1 Examples of use of half ropes
3.4
twin rope
dynamic mountaineering rope, which is capable, when used in pairs and parallel, to arrest a person's fall, see Figure 2
Figure 2 Example of use of twin rope
3.5
kernmantel rope
rope composed of a core and a sheath
3.6
static elongation
percentage of elongation deformation of sample to the original length under static load
3.7
dynamic elongation
percentage of elongation deformation of sample after the dynamic fall test to the original length
3.8
peak force
maximum tension on dynamic mountaineering ropes during the falling test of test object
4 Requirements
4.1 Construction
When tested in accordance with 5.2, the dynamic mountaineering ropes shall be made in a kernmantel construction.
4.2 Sheath slippage
When tested in accordance with 5.3, the sheath slippage in a longitudinal direction relative to the core (in positive or negative direction) shall not exceed 20 mm, see Figure 3.
1 — Sheath;
2 — Core.
a — Positive sheath slippage;
b — Negative sheath slippage.
Figure 3 Sheath slippage
4.3 Physical properties
When tested in accordance with 5.4 and 5.5, the physical properties shall meet the requirements of Table 1.
Table 1 Physical properties requirements of dynamic mountaineering ropes
Type Physical properties
Static elongation (%) Dynamic elongation of the first drop (%) Peak force during the first drop (kN)
Single ropes ≤10 ≤40 ≤12
Half ropes ≤12 ≤40 ≤8
Twin ropes ≤10 ≤40 ≤12
4.4 Number of drops
When tested in accordance with 5.5, single ropes and half ropes shall withstand at least 5, for twin ropes at least 12, consecutive drop tests without breaking.
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5 Testing Methods
5.1 Conditioning and test conditions
5.1.1 Conditioning
The test samples shall be successively treated under the following conditions:
a) Place the test samples for at least 24 h in an atmosphere of (50 ± 5)°C and less than 10% relative humidity;
b) Place the test samples in an atmosphere of (20 ± 2)°C and not more than 65% relative humidity for 2 h;
c) Place the test samples in an atmosphere of (20 ± 2)°C and (65 ± 2)% relative humidity for at least 72 h.
5.1.2 Test conditions
The test shall be conducted at (23 ± 5)°C.
Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Requirements
5 Testing Methods
6 Instructions for Use
