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Inner Wire Center - Dual Tensile Traction (BRT) 1370/1770
Number of Strands: (6-strand rope vs. 8-strand rope)
The wires used in 6 strand elevator rope have a larger diameter than those used in 8 strand rope. These larger individual wires provide better resistance to abrasion and require the use of larger sheaves and drums. 6 strand ropes are not suitable for use in high-speed elevators or where reverse bending is required. The smaller diameter wires used in 8 strand rope give it better flexibility. 8 strand rope is more resistant to fatigue from bending, provides a greater area of contact with the sheave and therefore maintains better traction than 6 strand rope.
Wire ropes have two aspects relating to lay. The first is the direction the strands are laid in the rope. The second describes the relationship of the wire lay of the strand to the finished rope lay. Elevator ropes are made in right regular lay, unless otherwise specified. Regular lay rope is the type of rope wherein the lay of the wires in the strand is in opposite direction to the lay of the strand in the rope. The crowns of the wires appear to be parallel to the axis of the rope. Lang lay is the type of rope in which the lay of the wires in the strand is in the same direction as the lay of the strand in the rope. The crowns of the wires appear to be at and angle to the axis of the rope. Lang lay ropes are used primarily in highly abrasive and/or reverse bending applications.
Most elevators utilize traction steel grade ropes. Extra high-strength traction steel ropes (EHS) are made with harder wire and provide higher strength for specific applications. Iron grade ropes are manufactured with lower tensile strength wire and are relatively softer and more flexible. Phosphor Bronze rope is spark resistant. Other ropes are available in select sizes and constructions.
Elevator rope constructions available are: 8x25 Filler, 8x21 Filler, 8x19 Warrington, 8x19 Seale, 6x25 Filler, and 6x19 Warrington. Above constructions are listed roughly in decreasing order of flexibility and increasing order of resistance against abrasion. That is, using similar reasoning described in ‘number of strands’ section when given the same diameter, strand construction that accommodates more wires in it will be more flexible due to smaller wire sizes within the strand. On the other hand, strands with bigger outer wires tend to have stronger resistance against abrasion wear, but less surface contact with the driver.
Standard Fiber Core ropes are made of sisal fibers and provide support for the strands. Cores are impregnated with lubricant that works its way outward to the rope surface during the operation of the elevator. Galvanized elevator ropes contain plastic cores engineered to support the rope and eliminate moisture accumulation. These cores also contain lubricant and do not absorb moisture. Independent Wire Rope Core (IWRC) ropes are also available. IWRC (steel core) ropes have less stretch and create a firmer structure to the rope diameter.
Elevator wire ropes come with a Bright (self-colored) finish and a lubricant designed to enhance the traction process. Galvanized wire ropes are available for special applications requiring additional levels of corrosion protection that can not be fully accomplished through the lubrication of the rope. Galvanized ropes are constructed of “Drawn Galvanized Wires” which allow our Galvanized Ropes to have the same breaking strength as our Bright Wire Ropes.
NOTE: Galvanized ropes contain either IWRC or PC (plastic fiber core), but not Sisal Core.