Wire Rope Direct News

WIRE ROPE LAY\'S and common abbreviations

WIRE ROPE LAY'S and common abbreviations.

When using and discussing wire ropes many abbreviations are used to identify the wire ropes construction, for your convenience we have detailed some of the most common lay's of wire ropes as well as some abbreviations used to identify the type of wire rope construction.

INCLUDING; Left and Right hand lay, Ordinary lay,  lang's lay, Cross lay, Equal lay and alternate lay.

RIGHT AND LEFT HAND LAY;

Right hand lay or left hand lay describes the way the strands are laid to form the rope. To find out which lay the rope is, a person holds the rope as it points away from them, as you look down the rope if the strands run in a clockwise direction, the rope is a right hand lay. If the strands appear to turn in an anti-clockwise direction then it is a left hand lay.                 

ORDINARY LAY; (sometimes referred to as reverse or regular lay)

With ordinary lay wire ropes the helix of the wires in the strand is in the opposite direction to that of the strand of the rope, and the rope is consequently stable and easy to handle. The wearing qualities arerelatively poor however due to the point contact on the crowns of the strands.

LANG'S LAY; (ALBERT'S LAY)  In Lang's lay wire ropes the helix in the wire is in the same direction as that of the strands in the rope. Because the surface pressure is spread over more than one wire in the strand the resistance to abrasion is greater than with ordinary lay, but the rope is relatively unstable and Lang's lay rope should only be used when ends are restrained. Otherwise unravelling may occur.

ALTERNATE LAY; (REVERSE LAY) direction to the lay of the strands The lay of wires in the strand alternate around the rope between being in the opposite and same that form the wire rope.

CROSS LAY; The cross lay is a construction in which strands are made in several operations and as a result the wires cross the crowns of the underlying wires.

EQUAL LAY; The equal lay construction is made in one operation in which all the wires have the same length of lay, this eliminates internal cross nicking and forms a compact strand of high metallic content.         There are three types of equal laid ropes;

SEALE;In which there are the same number of inner and outer wires, the outers lying in and being supported by the valleys of the inners.                   

      9 outer wires, 9 inner wires, 1 king wire 

WARRINGTON; The outer layer formed from pairs of different wire sizes. The smaller wire lying on the crown and the larger supported by the groove of the inner wires.

      6 large outer wires, 6 small outer wires, 6 inner wires, 1 king wire. 

FILLER; The cover is supported by the inner wires and small filler wires lying in their interstices.

12 outer wires, 6 filler wires, 6 inner wires 1 king wire. 

COMMON ABBREVIATIONS USED:

6X19  (E.G.) 6=number of strands in rope,   19=number of wires in strand.

RH =  Right hand lay

LH =  left hand lay

OL = Ordinary lay

FW = Filler wire

LL = Lang's lay

NR = non-rotating

FSWR = flexible steel wire rope

IWR = independent wire rope

IWRC = independent wire rope core

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