|Disaster Rescue - Australian Emergency Manual (Natural Disaster Organization, 183 p.)|
|CHAPTER THREE - ROPES, CHAINS AND SLINGS|
3.14 Climbing tape or webbing is commonly made from Polyamide (Nylon) in widths of 25mm and 50mm. With rated material breaking strains between 1250kg and 3000kg, tape is ideal for all manner of anchorage and attachment purposes, and is in normal use with karabiners and devices for mechanical descent.
Tape is normally tied off into slings with circumferences of 1200mm and 2500mm, referred to as 'single' and 'double' tape slings. Slings can be tied off to any length for particular purposes.
The ONLY safe knot for joining tape is the Tape Knot or Overhand Bend (Figure 3:8).
When tied off to form a sling with the Tape Knot, the sling has a theoretical breaking strain double that of the tape material. In practise, it is customary to observe a breaking strain rating which is 2/3 of the doubled material breaking strain, and therefore 1500kg tape in sling format is given a rating of 2000kg.
For anchorage purposes, a tape sling should be passed completely around the anchor point, and attachment made with a screwgate karabiner to both ends of the sling (Figure 3:9). The Larks Head Hitch (Figure 3:10) dangerously weakens the material, and is not safe for rescue.
Some examples of the uses of tape slings in disaster rescue are:
suspension of blocks from derricks;
the 'hinge' in a ladder hinge; and
anchorage of a descender.
Tape must be treated in the same manner as synthetic rope, subjected to all normal inspection and safety procedures, and recorded in the register.