Poly-What?! All About Synthetic Slings

what-are-synthetic-slings

Synthetic slings are generally available in two varieties – flat-woven web slings and round slings. Textile slings should perform in accordance with ASME standards B30.9-5.

Synthetic Slings: flat-woven web sling (or webbing sling)

Synthetic flat-woven web slings are usually made with woven polyester, polyamide (which is a fancy word for nylon) or polypropylene, and have an eye (basically, a loop) stitched at each end. They are available in Simplex (one layer) or Duplex (two layers).

Web slings are made with a safety factor of at least 5:1 – although other industries may require a higher safety factor.

Synthetic Slings: round slings

Round slings (also known as ’roundslings’) are made from load-bearing fibres with a protective, abrasion-resistant outer later. Their round form is known as ‘endless construction’, and are available in different lengths and capacities.

Synthetic Slings: beat the heat

Consider the temperature of both your surroundings and the load you will lift – synthetic materials have selective resistance to heat, which will effect which sling you choose.

Synthetic sling heat ranges are:

  • Polyester and polyamide: -40°C to 100°C
  • Polypropylene: -40°C to 80°C

These synthetic materials protect against a variety of chemicals, however – they offer different levels of protection against chemicals like acids. Synthetic sling chemical resistance is:

  • Polyamide (Nylon): Resistant to the effects of alkalis, but is attacked by acids.
  • Polyester: Resistant to acids, but damaged by alkalis.
  • Polypropylene: Shows little affect from acids or alkalis. Sustains damage from solvents and paint.
Synthetic Slings: colour codes

Synthetic material in slings are colour coded, in order to identify them properly. The label will be a specific colour, and may also have the type of material written as an abbreviation.

The colour codes are:

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Figure 1: Synthetic Sling Labels

 

Synthetic Slings: eye formations
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Figure 2: web sling types

The loop at the end of the web sling is called an eye formation – there are various formations to suit different applications.

There are six different types of web sling types – see figure 2. The six names for these slings are:

  • Type 1—Choker
  • Type 2—Basket
  • Type 3—Eye & Eye
  • Type 4—Twisted Eye
  • Type 5—Endless
  • Type 6—Reversed Eye
Synthetic Sling: round slings

These are made with multiple, high-tenacity yarns, which are covered with a protective sleeve. These are usually made from polyester – but, polyamide (nylon) and polypropylene are available too.

To identify these slings, an identification label is sewn into the cover which details user information and traceability requirements.

They are flexible, light-weight and very flexible.

Synthetic Sling: pre-use inspection

Follow these steps before using your synthetic sling each time – this will ensure you and coworkers will stay safe, and eliminates potential of the sling breaking and damaging the load.

If you find damage on your synthetic sling, it should be removed from service immediately – refer it to a competent person to have it inspected and repaired if necessary.

During your pre-use check, you should:

  • Check the sling label is present and legible and includes manufacturer, rated load for at least one hitch, material type, number of legs (if more than one) and the manufacturers code/stock number.
  • Check that the sling body has no signs of tears, cuts or severe abrasion
  • Check formed eyes for damaged stitching
  • Verify end fittings (where present) function correctly and are undamaged.
  • Check for signs of chemical damage.
  • Check that sling has undergone its periodic thorough inspection.
  • No knots in sling.
Synthetic Slings: shackles, hooks n’ hardware

When you attach a sling to hooks or shackles, take care to ensure the slings don’t bunch around the accessory. Bunching can cause damage since only a portion of the webbing supports the load.

When securing a load with webbing slings, don’t be concerned with the d/d ratio (diameter around the bent sling divided by the body diameter of the sling) – but you must consider the width of the webbing. Follow the manufacturer’s recommendations when you lift with synthetic web slings.

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Note: the sling that lies in the shackle fits perfectly – there’s no bunching or a sling that protrudes from the shackle pin.

Hercules SLR – Custom Rigging and Lifting Solutions

Hercules SLR offers custom lifting solutions. We’ll match you with the best equipment and hardware for your project needs, and we’ll customize equipment to meet your specifications.

Need a lift? Drop us a line at info@herculesslr.com to speak with one of our rigging experts – we’ll take you where you need to be.

Need proof? Read about the Frankensling we made for The Town of Oakville Marina, our rigging fundamentals course that Hercules staff from across Canada completed at the Hercules Training Academykeep your synthetic round slings in good working order with our Free Downloadable Synthetic Round Sling Inspection Guide or read our blog on how to prevent synthetic round sling damage.


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.

Hercules’ Tips: Prevent Synthetic Round Sling Damage

synthetic-slings

We’ve discussed what to look for when assessing your synthetic round sling for damage—but how do you prevent damage from happening in the first place?

Read on for essential tips to prolong the life of your synthetic round slings.

Round Sling

First and foremost, you should avoid activities that cause chemical burns, bunching, tears or exposed yarns. To prevent damage to your round sling, refrain from:

  • Dropping or dragging it along the ground or rough surfaces;
  • Pulling slings from under loads when load is resting on the sling—place blocks under load if possible;
  • Shortening or adjusting the sling using unapproved methods;
  • Twisting or knotting the sling;
  • Exposing sling to damaging alkali’s or acids;
  • Exposing sling to sources of heat damage or weld splatter;
  • Using slings or allowing exposure to temperatures above 194° (90°C) or below -40°F (-40°C).
  • “Tip Loading” a sling on a hook rather than centering it in base, or “bowl” of the hook;
  • Using hooks, shackles or other hardware that have edges or other rough surfaces which could damage the sling;
  •  Running/driving over sling with a vehicle or other equipment.

In addition to these factors, exposing synthetic slings to certain chemicals can cause minor or total degradation—time, temperature and concentration factors affect degradation. Consult your sling’s manufacturer for specific applications.

Sharp Edges and your Sling

One of the most crucial aspects of protecting your sling is ensuring it’s kept away from sharp edges. It’s important to note that edges or surfaces in contact with your sling don’t have to be “razor” sharp to cause sling failure. Slings can be damaged, worn down or even torn as tension between your sling, connection points and cargo develops.

Protect damage to your sling from corners, protrusions or contact with any edge that isn’t rounded or smooth. To do so, a qualified person will determine appropriate methods for protecting the sling in relation to the conditions it will be used in. The qualified person may use specially developed protectors like sleeves, wear pads or corner protectors to shield the sling from harsh edges.

Conducting lift tests (in a non-consequence setting) is recommended to test your safe-guarding methods—remember to inspect your sling after each lift test for damage and suitability.

Can my Sling Ever Touch Edges?

Avoid your sling directly contacting edges, unless the edge is:

  • Smooth and well-rounded;
  • The size of the radii is adequately large. Use the table below (Image 1) to determine the minimum edge radii suitable for contact with synthetic slings.
Image 1

Prevent further damage to your sling by storing it in a clean, dry and dark place. Use mild soap and water to wash your sling, and never place it in the washing machine. Avoid storing somewhere your sling may be exposed to acids or other harmful chemicals or splatters.

Overall, even when following every safeguard described above things may go wrong. Be sure to asses your load properly, never place any part of your body between yourself and the sling, and always ensure all personnel are clear from lifted or suspended loads.


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.

 

Synthetic Roundslings – Free Inspection Download Guide

bunched synthetic round sling by hercules slr

Synthetic roundslings are an integral part of heavy-lifting and rigging. Similarly, proper sling inspection is integral to ensure the job is done safely and properly.

Read on to find out how to inspect your roundslings for use.

Look and Feel for Damage

Most damage to a roundsling can be found simply by looking. However, internal damage can be present as well. Inspect for internal damage by feeling along the slings’ entire length.

Minor Damage Causes Major Incidents  

Damage to a roundsling may seem minor or small, yet this can drastically reduce its ability to lift or hold heavy loads.  This increases its risk of breaking during use−which can result in large costs, damaged material and most importantly, injured people.

In reality, no damage to a roundsling is minor−if damage is present, it should not be used.

What Should Operators Look and Feel for?

–        Missing Identification tag;

–        Holes, cuts, tears, snags that expose core yarn, excessive abrasive wear;

–        Broken or damaged yarn core;

–        One or more knots are tied to roundsling;

–        Acid or caustic burns of roundsling;

–        Melting, charring or weld spatter of any part of roundsling;

–        Distortion, excessive pitting, corrosion or other damages to fitting(s);

–        Broken or worn stitching in the cover which exposes the core yarn;

–        Any conditions that cause you to doubt the roundslings’ strength.

Inspection-of-Synthetic-Slings
Click on the above image to download our Synthetic Sling Inspection Guide
I’ve Found Damage−Now What?

If any damage is found, pictured above or otherwise, the sling must be removed from service. When removed, the sling must be completely destroyed, and must be made unusable for future use. If it’s repairable, it must be proof-tested by the roundsling’s manufacturer or another qualified tester.

 

Frayed Sling

 

Sling damage should never be temporarily repaired.

Synthetic roundslings are an integral part of heavy-lifting and rigging−however, proper inspection is also necessary to ensure the job is done safely, and properly. Keep reading to find out how often to assess your roundslings before use.

Inspections—how often should I do this?

Roundsling inspection should use the following 3-step procedure, which ensures slings are inspected frequently enough. The stages are:

Initial Inspection

When your sling is received, a designated employee will ensure the correct sling has been received, is undamaged and that it meets requirements for use.

Frequent Inspection

The roundsling should be inspected before each shift, each day in normal service. When using for severe service application, the roundsling should be checked before each individual use.

Periodic Inspection

Every sling should be periodically inspected by a designated person. However, this inspection should be performed by someone who does not regularly inspect the sling. This provides an opportunity to find issues that previous inspections may have missed or overlooked.

Period inspections are based on how frequently used slings are, or how frequently you anticipate you will use them for. Other factors include the severity of conditions and what type of work the sling is used for. Inspections may also be based on slings used in the past under similar circumstances.

Generally, inspections should be done as follows:

  • Normal Service—yearly
  • Severe Service—monthly to quarterly
  • Special Service—as recommended by a qualified person

Intervals between inspection should never exceed one year. Written records are not required for frequent inspections, however written records should be kept. The WSTDA, RS-1 and ASME B30.9 require written record of the latest inspection.

Original Article here: https://riggingcanada.ca/articles/safe-usage-guides/round-sling-safety-bulletin/round-sling-safety-bulletin.pdf

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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.