Category Archive : Lifting Equipment

steel wire rope

An Overview Of Steel Wire Ropes

Lifting operations are executed in all areas of the iron and steel plant. In such operations, we require reliable materials for the safety of the workers. Steel wire ropes are a crucial material since everything depends on its performance.

Steel wire rope is commonly called steel cable. They are constructed of several thin strands of steel wires wound into a helix. The multiple steel wires that form separate strands are laid in a helical pattern around a core. The commonly used layout is six strands. For example, the number of wires in each strand is 6 * 19, 6 * 36, 6 * 61. The structure provides flexibility, strength, and the ability to resist bending. Different applications of the material, strand, and wire structure provide different benefits.

Wires are building blocks of a steel wire rope. The strands are helically placed together around a centre, which is called a core, to form a wire rope. The design strands affect the properties, like resistance to abrasion and fatigue resistance. Selecting the proper wire rope for a lifting operation needs careful considerations.

Components Of Wire Rope

There are 3 basic components in the design of a steel wire rope. They are:

  • Wires produced from steel that forms a singular strand
  • Multi-wire strands laid in a helical pattern around a core
  • The core

Wires

They are the basic and smallest components of wire rope, and wires make up individual strands of rope. Wires are made from various metal materials such as steel, iron, and stainless steel. The wires are manufactured according to certain grades related to strength, fatigue resistance, corrosion resistance, resistance to wear, and curve of wire. Forming a strand of the correct size and characteristics needs high precision. The wire can be coated but is commonly available in an uncoated or bright finish.

Strands

Strands of a wire rope include two or more wires arranged and twisted in a specific arrangement. These individual strands are laid in a helical pattern around the core of the steel wire rope. Strands made of larger diameter wires have high resistance to abrasion, while strands of smaller diameter wires are more flexible.

Core

The crux of a steel wire rope is the prime feature. It is presented in the centre of the steel wire rope. It supports the strands in the rope to maintain their relative position under bending and loading stresses. Cores can be made from various materials, including synthetic or natural fibres and steel.

Advantages Of Steel Wire Ropes

  • Increased resistance to corrosion
  • Increase in resistance to abrasion
  • Low contact pressure
  • Higher flexibility
  • Bigger metallic area
  • Large surface area
  • Resistance to metallic damages
  • Reduced mechanical stress on rope and sheave.
  • Cost reduction because of reduced rope abrasion and increased service life at less expense

Causes Of Failure:

Some common causes of steel wire rope failure are:

Kinking- This results in rope deformation and localised wear.

Overloading- Causes accelerated wear, rope crushing, abrasion, and complete rope failure.

Whipping- Whipping a line results in squared-off broken wires.

Improper spooling- Results in crushed and distorted ropes.

lifting clamp

Three Things To Keep In Mind When Choosing Lifting Chains And Slings

Accidents caused by falls are the leading cause of mortality in the construction sector. As heavier items are hoisted as work progresses, the lifting slings may fail, resulting in catastrophic falls. To prevent such terrible events during your construction job, use the proper lifting slings to transfer, position, and raise a weight. Choosing lifting chains and slings should be simple if you understand how they work, what environment they should be used, and how much weight they should lift.

You want to choose the finest lifting sling that will provide the best service for your building project. As a result, while selecting lifting clamp, these variables must be taken into account.

The Weight And Fragility Of The Load

Know the weight of the load you plan to lift ahead of time. It will assist you in selecting the lifting chains and slings with the appropriate strength. For example, if you are lifting large generators or tanks, you may use synthetic web slings to support the load and keep it from being damaged. If you utilized wire rope slings instead, your tank or generator would be scratched. Remember that the goal is to raise an item while protecting it from harm during the lifting operation. The larger items are usually composed of hard metals, making them easier to hoist using rough lifting slings like alloy chain slings.

Center Of Gravity Of The Load

The form and design of a load will reveal its centre of gravity. When lifting, the load will swing in a powerful push if you miss the centre of the weight, causing harm to persons and property. Consider lifting slings with the greatest flexibility for lifting irregularly shaped items. Synthetic slings are ideal for these irregularly shaped items since they can readily wrap around the object and conform to its contour.

Are The Objects Abrasive, Sharp-edged, Or Hot?

During the building process, you may need to lift certain items with sharp edges. Sharp-edged items may rip lifting chains and slings, such as synthetic rope slings and synthetic round slings. If this occurs, a catastrophic fall will occur, and the item will be ruined. Consider using alloy chain slings or wire rope slings for sharp-edged and abrasive items.

Lifting chains and slings should be purchased from a reputable rigging supply company to ensure the highest quality. This is, of course, after considering the lifting sling’s environment and the kind of weights you want the lifting sling to hoist. You may also ask the rigging and supply company to assist you in sorting through the many kinds of lifting clamps. With their expert advice, you can be certain that you are making the right choice when it comes to lifting slings. 

steel wire rope

Characteristics Of A Good Steel Wire Rope

It is critical to evaluate the application’s different characteristics when choosing the appropriate steel wire rope and then priorities these properties. It is also crucial to be informed of the applicable rules and regulations. 

Tensile Strength

The tensile strength of a steel wire rope is determined by its size, wire tensile strength, and structure. The Randers Reb product catalogue lists the minimum guaranteed tensile strength for several rope types.

A steel wire rope should never be exposed to a load greater than 50% of its breaking strength.

Abrasion Resistance

Steel wire ropes with thick outside wires are abrasion-resistant. Lang lay ropes are more resistant to abrasion than standard lay steel wire ropes. Wires with higher tensile strength may also help to improve abrasion resistance.

Bending Fatigue Resistance

The strand’s bending fatigue resistance and flexibility increase as the number of wires increases. Lang lay steel wire ropes are more resistant to bending fatigue than standard lay steel wire ropes. 

Resistance To Corrosion

Wires that are galvanized and rustproof provide high corrosion resistance. Corrosion resistance may also be improved by lubricating with specific kinds of grease or oil. It is recommended that strands with thick outer wires be used if the steel wire rope is exposed to severe corrosive effects.

Elongation

Steel wire ropes with fewer wires, the most excellent elasticity modulus. Therefore, this steel wire rope is perfect for manropes. However, it cannot be used to run over sheaves or blocks. Thus, 6×7 or 6×19 steel wire rope, either with a steel core or with specific unique constructions, should be utilised if just a modest degree of elongation is needed while passing over sheaves.

The Standard For Rotation Resistance

Steel wire rope with a regular lay offers more resistance to rotation than steel wire rope with a lay. A steel wire rope with a steel core spins slower than one with a fibre core. Low-rotation and rotation-resistant steel wire rope is the kind of rope that offers the most resistance to rotation.

Crushing Resistance

A steel core offers more excellent strand stability than a fibre core, which is why a steel wire rope with a steel core has a lower chance of flattening. In addition, flattening/crushing resistance is higher in strands with fewer, thicker wires. 

Resistance To Vibrations

Vibrations transmit shock waves through the steel wire rope from wherever they originate, absorbed by the steel wire rope at some point. In certain instances, they cause localised destruction of the steel wire rope. This may happen, for example, when the steel wire rope meets a sheaf/block or enters the drum, as well as at the end terminals. Steel wire ropes with the highest flexibility also have the highest vibration resistance in general.

Resistance To Pulsation

Variations in the tension of a steel wire rope may decrease its life expectancy depending on the magnitude and frequency of the changes. Steel wire ropes with the highest elasticity, in general, can handle intermittent loads better. However, end terminals or fittings should be used with caution, as their pulsation resistance is just as essential as choosing the appropriate steel wire rope.

round sling

Best Quality Round Slings Are Here At Your Disposal

If you plan for your next lifting project, you will require a new set of lifting equipment. Apart from chain slings and wire ropes, round slings are also efficient for heavy lifting duties. Choosing the right type of lifting equipment is very important for the success of your projects. If you are new, you must understand the applications of different lifting equipment, including round slings. Here are some things which you should consider while choosing the perfect lifting sling for your work:

Factors To Consider For Making The Right Choice

Generally, choosing the right lifting sling is dependent on a number of factors. Here are the points to focus on while making your choice:

  • The Centre of Gravity
  • The Working Load Limit
  • Number of Attachment Ends 
  • Environmental factors
  • Height Restrictions 
  • Safety Protocols
  • Quality of the Lifting Slings
  • The material used to Manufacture Lifting Skills
  • The Purpose of its Use
  • Additional Fitting Requirements 
  • Flexibility
  • Suitability for rigging 

What Is A Round Sling? 

A round sling is a continuous loop of yarn. They are usually made of highly tensile polyester. They can be colour coded and are very durable. Round slings can lift and transport heavy loads ranging from 1 to 30 tonnes. All sorts of load-bearing round slings have a protective sleeve of polyester on them, ensuring their durability. Round slings are available in different grades, with different weight capacities. Lifters mostly prefer round slings for rigging. 

Advantages Of Using Round Slings

When it is for the important purpose of lifting, you require products that are reliable, strong and ensure safety. For meticulous tasks, round slings or web slings are mainly recommended as it has several advantages :

  • Multi-purpose

Round slings can be used for various purposes. Whether it consists of secure rig bridles to pull, drag or move industrial products or equipment, round slings are suitable for the job. 

  • Customised

Round Slings can be customised as per its requirement. Slings can be in the form of cables, chains, ropes or webs. Metal devices like hooks, links, rings or shackles can be connected to it. The overall length of a sling can also be adjusted. Longer slings are used when there’s a requirement of greater range. Typically the length of a sling is about 2.0 to 3.3 feet. 

  • Durable & Sturdy

Round slings are strong and light and can be easily handled without much strain. A tubular jacket usually protects heavy load-bearing core yarns. Polyester made round slings are flexible. It is believed to be an ideal material for modern slings as its stretch capacity is lower. They are splinter-free and don’t get easily damaged. 

  • Flexible And Safe

Modern round slings are flexible and safe. High-performance round slings have seamless edges, which prevents them from rupturing. The slings are flexible enough to conform with the load and shape, allowing it to grip easily and safely. 

 

So whether it is for lighter or heavy lifting jobs or moving goods or industrial products, round slings can be a brilliant choice for you.