Technical Parameters

1. Wire Rope Components

We have one of the best state of the art Indigenously designed plant and machinery installed, which helps us achieve the high quality standards followed by us. The result of this is our Superior quality, Defect free, Strong & Reliable Wire Ropes & Strands.

Selection of Wire Ropes

Bright, Galvanized or Stainless steel?

• Bright steel wire ropes mean no surface treatment is applied to the rope. Therefore, they have the lower price among these three wire ropes. Generally, they are fully lubricated to protect the rope from rust and corrosion.
• Galvanized steel wire ropes feature compressed zinc coating for providing excellent corrosion resistance. With higher break strength yet lower price than stainless steel, galvanized steel wire ropes are widely used in general engineering applications such as winches and security ropes.
• Stainless steel wire ropes, made of quality 304, 305, 316 steels, are the most corrosive type for marine environments and other places subjected to salt water spray. Meanwhile, bright and shiny appearance can be maintained for years rather than dull as galvanized steel wire ropes.

FC, WSC or IWRC?

FC stands for fiber core, made of natural or synthetic fiber, which can provide excellent flexibility and resistance to contact pressure. The fiber core can store lubrication to reduce the friction between wire strands effectively. Meanwhile, the fiber core makes the rope lower deformable with low elastic rope elongation.

WSC is abbreviation of wire strand core. WSC ropes features better heat resistance than FC ropes, meanwhile, increase metallic section provide added 15% of strength. However, WSC steel ropes are less flexible than those with fiber cores.

IWRC is short for independent wire rope core, which strengths the rope, reduce tensile stress in individual wires as well as makes the ropes more resistant to crushing. At the same time, IWRC wire ropes have the maximum heat resistance than others FC or WSC ropes.

2. Lays of Wire Rope

Cross Laid or Parallel Laid?

Cross laid wire rope means each wire of different layers contacts in points and has relatively large spaces between wires. It is extremely flexible and generally used in slings. Compared with parallel laid wire rope, this one has smaller contact area which makes it easier to fail due to fatigue and shear over time.

Parallel laid wire rope has wider contact areas with minimal breaks caused by inside abrasion. They boast low bending fatigue and higher breaking load without any destruction of strand shapes taking advantages of their tight structure. Normally, parallel laid wire ropes can be classified into four types: seale type (S), filler wire type (F), warrington type (W) and warrington & seale type (WS) as shown below:


The Seale type

The outer stands have larger diameter than inner strands for excellent abrasion resistance and high flexibility.


Filler wire type

With small wires in the valley between outer and inner strands, filler wire rope features good abrasion and excellent fatigue resistance.


Warrington type

Warrington ropes feature alternative large and small outer strands for great flexibility with resistance to abrasion.


Warrington & seale type

It is a combination of warrington type and seale type with large diameter and high abrasion resistance.


Regular, Lang or Alternative Lay?

Steel wire ropes are composed of multiple strands of individual wires that are surrounding a wire or fiber center to form a combination with excellent fatigue and abrasion resistance. These wires and strands are wound in different directions to from different lay types as follows:


Right Lay

Left lay

Regular Lay

Lang Lay

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3. Lays of Wire Rope


4. Winding & Re-reeling steel wire ropes

It is important to attach steel wire ropes at the correct locations on a smooth drum as improper winding methods will cause the spreading of terns in the first layer of steel wire ropes on the drum. Then the second layer of wire ropes may be wedged between the open coils of first layer, crushing and flattening the rope as successive layers are spooled.

Generally, steel wire ropes are wound from the top of the one reel to the top of another or from the bottom to bottom. But how to start wire ropes on a drum may puzzle lots of our customers. The following illustration will give you the best solution.

Underwind - left to right
Underwind - right to left
Overwind - right to left

The right hand normally are used to determining right-lay wire ropes and the left hand for left lay wire ropes when standing toward the drum.
The clenched fingers represent the drum and the extended finger stands for the oncoming rope.
Many crane models also have two sided grooved drums for winding wire ropes as shown in the picture.


Tow side grooved drums-1
Tow side grooved drums-2

When re-reeling steel wire ropes from horizontally supported reel to another drum, make sure that the rope is traveling from the top of the reel to the top of the drum or bottom to bottom to avoid a reverse bend. Look at the following picture about the right and wrong method of re-reeling:

Right method of re-reeling wire ropes

Wrong method of re-reeling wire ropes

Wrong method of re-reeling wire ropes

Note:
When re-reeling steel wire ropes, make sure the surface of the drum is clean, smooth and dry to protect wire ropes from damages by foreign particles.

For reels with vertical shafts, re-reeling is also available but you must to ensure the rope is always taut to avoid accumulation of slack.

5. Seizing of Steel Wire Ropes

Whatever cutting methods you are applying, certain precaution needs to be taken care of i.e. seizing both rope ends must be employed to protect the steel wire ropes from loosening because carelessly or inadequately seized ends may cause distortion and flattening of the rope. If these loose ropes are applied to works, uneven distribution of loads to the strands may shorten the life of ropes badly. So it is important to seize the wire ropes in the optimal way.

Normally, two methods are widely accepted by our customer. The method one is suitable for wire ropes with diameter over one inch, while the method two is for those with diameter one inch and under.

Seizing wire rope - method one

Method One
  • 1. One end of the seizing wire is placed between the valleys of two strands.
  • 2. Turn another end around the rope and the fixed end of seizing wire closely and tightly at right angles.
  • 3. Stop turning after the proper length of seizing has been applied.
  • 4. Twist two ends of seizing wire together and make sure they are seizing the rope tightly.

Seizing wire rope - method two

Method Two
  • 1. Wrap with small wires as shown in the picture.
  • 2. Twist the two ends of seizing wire together.
  • 3. Alternatively tight twist with nippers.

Tips

  • The seizing wire & strands should be soft or annealed.
  • The diameter and length of seizing wires may different as the diameter of the wire rope. Make sure that the seizing length is no less than the diameter of the steel wire rope.
  • Generally, one seizing on each side of the cut is sufficient for preformed ropes. But for rotation resistant or non-preformed ropes, no less than two seizing parts are needed with the distance about six rope diameters.

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