CONSTRUCTION AND LAYS The size and number of wires in each strand, as well as the size and number of strands in the rope greatly affect the characteristics of the rope. In general, a large number of small-size wires and strands produce a flexible rope with good resistance to bending fatigue. The rope construction is also important for tensile load (static, live or shock) abrasive wear, crushing, corrosion and rotation. The number of strands and wires will influence the flexibility, fatigue and wear resistance of any given wire rope. Rope selection is often a compromise. Generally the more load bearing wires in the rope the greater the flexibility, however the smaller the wires the less abrasion resistance. For example, the same nominal diameter 7 x 7 wire would be less flexible than a 7 x 19 wire, hence a large number of small size wire and strands produce a flexible rope with good resistance to bending fatigue wear. The construction of wire rope is defined by the number of outer strands (first number), and the number of wires within that strand (second number) and then by the arrangement of the wires in each strand (shown in brackets). The wires in each strand can be arranged in several ways, for example a 6 x 19 construction the 19 wires in each strand are laid 9 around 9 around 1 centre wire.
ROTATING OR NON-ROTATING Rotation resistant wire ropes are manufactured to resist rotation under load and are suitable for crane use and where long lengths are required.
NON-ROTATING OR ROTATION RESISTANT WIRE ROPE – SHOULD BE USED WHEN: • Lifting an unguided load in single part • Lifting an unguided load at great height with multi part reeving. A REGULAR ROPE (ROTATING) WIRE ROPE SHOULD BE USED WHEN: • Lifting a guided load on several falls at a small height (e.g. overhead crane) • When lifting loads with right-hand and left-hand ropes in pairs. MANUFACTURED WIRE ROPE SLINGS Bunzl Safety & Lifting can manufacture single, two, three, four and five leg wire rope slings and provide a wide range of end terminations. All assemblies are made to Australian Standard AS1666.
RHOL
Right Hand Ordinary Lay
LHOL
Left Hand Ordinary Lay
RHLL
Right Hand Lang’s Lay
LHLL
Left Hand Lang’s Lay
Pref
Preformed
Post
Postformed
WRC
Wire Rope Core
WSC
Wire Strand Core
FC
Fibre Core
FW
Filler Wire Strand Construction
D or d
Diameter (in millimetres)
Right Hand Ordinary Lay
Left Hand Ordinary Lay
Right Hand Lang’s Lay
Left Hand Lang’s Lay
Right Hand Alternate Lay
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