Which Rope Has the Greatest Tension?

wire rope rigging, Which Rope Has the Greatest Tension?

WHICH ROPE HAS THE GREATEST TENSION?

Which rope has the greatest tension? That’s a good question, with many answers that might surprise you. 

Rope tension can be a confusing concept for some to grasp (they’ve even studied why students have such a hard time grasping the concept of tension with a block and pulley)—we’re going to explain why ‘which rope has the greatest tension?’ isn’t necessarily the best question to ask.

Instead, we’re going to discuss how tension affects rope, and why different rope will demonstrate different tensions depending on the conditions. 

Rope tension is affected by a number of things. like the size/weight of the load, length of rope, diameter of the sheave, speed/velocity of the pull and any wear & tear the rope has been placed under. 

In this article, we’ll cover:

  • What’s rope tension, and why does it matter? 
  • Hoisting equipment selection
  • Tension fatigue—What is it? 
  • Tensile strength—What is it? 
  • Rope at Hercules SLR 

WHICH ROPE HAS THE GREATEST TENSION?

WHAT IS ROPE TENSION? 

Tension refers to what happens when a rope or cable is used to transmit a force. Put even simpler, rope is under tension when it’s attached to something. 

Consider what happens when a rope and hoist pulls a piece of building material. In this scenario, the rigger themselves isn’t in contact with the load, they’re not placing direct force on the load—The rope is. 

It’s a simple concept, with many ways to calculate, which all depend on different circumatances, like the weight the rope must lift and other factors that might impact tension. 

WHICH ROPE HAS THE GREATEST TENSION? 

There are many ways to discuss rope tension. Steel (iron combined with other mined materials) is considered to have one of the greatest tensile strengths. However, steel wire rope’s construction and fabrication can impact tensile strength, and its rated capacity.

This might seem a bit over-complicated, but it’s worth understanding how tension works, even if you’re not a physicist. Most mechanical applications use tension, which is calculated in newton’s. 

What’s a newton? A newton is the force you need to accelerate a 1-kilogram mass by 1-metre per second if no friction is present. However, this can change very quickly—that’s why for the sake of practicality, we won’t discuss what these calculations are, but how tension impacts a rigging operation. 

EQUIPMENT SELECTION & TENSION

Tension can help you understand rope’s breaking strength, as well. Breaking strength refers to the weakest point of the rigging (in this case, a rope) whether it be the webbing, end-fittings, or tensioning device.

A tensioning device is used to apply force at a particular point in the rigging to create tension. This is typically done to reduce hazards that would happen otherwise.  

TENSION FATIGUE

Tension fatigue happens to steel wire rope or synthetic rope when it’s subjected to different stress-levels (represented by the stress level exerted on the rope).

Basically, tension deteriorates with time and the older a rope is, the less accurate it’s original ratings become.

TENSILE STRENGTH

First of all—What’s tensile strength? Tensile strength (in this case) measures the force that would break the rope when under pressure. 

There are three kinds of tensile strength—They are:

1) Yield Strength

Yield strength refers to the highest amount of stress the rope can withstand without causing any deformations to the original rope dimension’s. 

2) Ultimate Strength

The ultimate tensile strength refers to the total amount of stress or force the rope can take.

3) Breaking Strength 

Breaking strength refers to a rope’s ability to withstand a lift, pull or move at a specific point. 

ROPE AT HERCULES SLR 

Although we didn’t necessarily tell you ‘which rope has the greatest tension’, we hope this helps you decide which rope to choose based on their tensile properties and what works best for the application, lift and load.

Hercules SLR carries rope for marine, safety, rescue, arborist applications and more—Drop us a line and we’ll pair you with the best rope for whatever application you have. 


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FOR RELATED READING,

VISIT OUR BLOG:

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Hercules SLR is part of the Hercules Group of Companies. We have a unique portfolio of businesses nationally, with locations coast-to-coast. Hercules Group of Companies provides extensive coverage of products and services that support a variety of sectors across Canada which includes the energy, oil & gas, manufacturing, construction, aerospace, infrastructure, utilities, mining and marine industries. 

Hercules Group of Companies is comprised of: Hercules SLRHercules Machining & Millwright ServicesSpartan Industrial MarineStellar Industrial Sales and Wire Rope Atlantic.

We have the ability to provide any hoisting solution your business or project will need. Call us today for more information. 1-877-461-4876 or email info@herculesslr.com

Turnbuckles – Creating Tension in Multiple Industries

turnbuckle

Turnbuckles, stretching screws or bottlescrews are a device for adjusting the tension or length of ropes, cables, tie rods, and other tensioning systems. It normally consists of two threaded eye bolts, one screwed into each end of a small metal frame, one with a left-hand thread and the other with a right-hand thread. The tension can be adjusted by rotating the frame, which causes both eye bolts to be screwed in or out simultaneously, without twisting the eye bolts or attached cables.

Turnbuckles are most commonly used in applications which require a great deal of tension; they can range inturnbuckles mass from about ten grams for thin cable used in a garden fence, to thousands of kilograms for structural elements in buildings and suspension bridges.

Construction

Turnbuckles with various size are popularly used in construction. They combine strength and durability, yet are simple to set up and adjust. Very small turnbuckles (as light as 10 grams) might be used to support a fence in a garden. On the other hand, extremely large turnbuckles (as heavy as several thousand kilograms) are widely used as support high-rise buildings or in structures such as bridges.

Aircraft

Turnbuckles have been used in aircraft construction. Historically, biplanes might use turnbuckles to adjust the tension on structural wires bracing their wings. Turnbuckles are also widely used on flexible cables in flight control systems. In both cases they are secured with lockwire or specifically designed wire clips to prevent them from turning and losing tension due to vibration.

Shipping

Turnbuckles are used for tensioning a ship’s rigging and lashings. This device is also known as a bottlescrew in this context.

Sports

Turnbuckles find common use to tension the ropes in professional wrestling rings and boxing rings, where they serve as the attachment between the ring ropes and ring posts. Rather than the usual bare metal, here the turnbuckles are covered with padding in order to protect participants and staff. Turnbuckles even play a part in professional wrestling where they are often dramatically used by participants as part of their offensive move set.

Entertainment industry

Turnbuckles are used in nearly all rigging performed in the entertainment industry, including theatre, film, and live concert performances. In entertainment rigging, turnbuckles are more commonly used to make small adjustments in line lengths. This is generally to make a flown unit sit parallel to the stage. Another way a turnbuckle could prove helpful is with making very minor height or angle adjustments.

Pipe systems

Turnbuckles are used in piping systems as a way to provide minor adjustments for field inconsistencies. This also allows for a minimum amount of resistance when transferring the load to the support components.

Orthopaedics

A type of splint is used for upper limb to produce gradual stretching over contracted joint by its turn buckle mechanism. Used to treat stiff elbow and Volkmann Ischemic Contracture.

 

Hercules SLR is part of the Hercules Group of Companies which offers a unique portfolio of businesses nationally with locations from coast to coast. Our companies provide an extensive coverage of products and services that support the success of a wide range of business sectors across Canada including the energy, oil & gas, manufacturing, construction, aerospace, infrastructure, utilities, oil and gas, mining and marine industries.

Hercules Group of Companies is comprised of: Hercules SLRHercules Machining & Millwright ServicesSpartan Industrial MarineStellar Industrial Sales and Wire Rope Atlantic.

We have the ability to provide any solution your business or project will need. Call us today for more information. 1-877-461-4876. Don’t forget to follow us on Twitter LinkedIn and Facebook for more news and upcoming events.