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The Important Difference Between Load Binding Transport Chain and Lifting Chain

     There are a number of important factors to consider when using chain to lift a given obstacle. Shiny, gold, Grade 70 Transport chain is intended for load binding only. This chain is used to hold heavy items down to a flatbed truck and the gold-chromate finish as well as the carbon-steel construction makes this chain easy to spot and more difficult to break. 



     With this said, this chain should not be used for lifting unless it has been fabricated by a sling manufacturer and the manufacturer is required to follow guidelines for fabrication. ASME and/or ASTM standards must be followed and they require that either grade 80 or 100 chain be used in sling fabrication, due to the alloy steel construction and its ability to elongate when overloaded as opposed to snapping suddenly. The manufacturer will also have to put a tag on the chain sling that indicates what maximum load or Working Load Limit can be safely applied to the sling, making it easier for end users to know the limitations.

     When lifting any objects off of the ground, the weight of said object as well as the capacities of the lifting device and rigging must all be known before making the lift. This important guideline is something that the Northern Strands' Training Division focus on in the Below the Hook Rigging training. Sections 208 and 209 of the Saskatchewan’s Occupational Health and Safety Regulations refer to this concept directly as well.

     When in doubt about whether to lift a load with a certain chain or not ask yourself this question: Does the chain have a tag on it indicating its Working Load Limit?

If yes – there are a number of other questions you should ask yourself after this to determine that all of the parameters  related to the lift are safe.

If no – do not attempt the lift and look for an alternative solution.


     When performing any sort of lift whatsoever, it is important that workers are trained in safe rigging practices and that they are competently supervised. Whether you are an employee or an employer, feel free to contact Northern Strands about our various Safety Courses and our Below the Hook Rigging Seminars.


For more information about Below the Hook Rigging Seminars click hereHook Rigging Seminars

For more information about all Safety Training Courses click here: Safety Training Courses


Northern Strands Training Division Contact Information

Email: training@northernstrands.com

Phone: 306-242-7073


How Important is Wire Rope Lubrication?

In order to fully understand the importance of the regular application for wire rope lubrication during the working life of stranded or full locked coil hoisting ropes, it is first necessary to analyze the function of any such lubricant.

a) Each wire in any wire rope construction must remain as free as possible from adjacent wires so it can move to accommodate its allocated share of the varying rope tension it has to endure.  This is especially important when the rope is performing at high speed and/or under the high wire contact stresses encountered during hoisting.  Rope design is intended to minimize inter wire frictional contact but only by good lubricating practices can this effect be fully accomplished.

b) The majority of hoist ropes utilized in shafts are subject to corrosion from one cause or another. Shaft water containing a high salt content, chemical fumes, and upcast shafts producing condensation, are among the more notable causes.  Regardless of the cause, it is essential to guard against or retard the certainty of corrosive attack on the steel.  Experience has shown that the application of galvanized wire is only partially successful because the finish soon wears off. Therefore, it is clear that in-service lubricants must possess the following qualities:

a) Penetrate easily into the rope.
b) Displace moisture from the internal and external surfaces.
c) Provide good corrosion protection both internally and externally.
d) Be resistant to emulsification.
e) Possess good rope adhesive properties.
f) Resist removal by mechanical forces.
g) Possess good anti-wear properties.
h) Be compatible with the lubricant already employed during rope manufacture. 

It should be pointed out that in the case of full locked coil and many plastic enhanced hoisting ropes, in-service lubricant is confined solely to the outside wire. This is because the inner rope is already sealed off with adequate lubrication. 

Without lubrication during the working life, wire ropes may suffer from premature withdrawal from service:

1) Premature wire breaks occurring in the ropes and caused by internal and/or external corrosion.

2) Premature wire breaks occurring at the strand interstices due to lack of proper inter strand movement.

3) Strand displacement, loose wires, and rope waving, leading to loss of cross section stability. Additionally, the correct lubricant is of key importance during rope manufacture.  Through a German study (see chart below), it is proven that the proper lay-up lubricant can have a great effect on rope life. 

The chart depicts:


Wire rope un-lubricated
Wire rope lubricated, but with general lubricant not designed for wire ropes
• Standard lubricant designed for wire rope wires
Wire rope application-specific lubricant Plastic enhanced

 

Northern Strands is an official supplier of Kirpatrick Lubricants in Canada.

Northern Strands is proudly Saskatoon, Saskatchewan owned and operated.

Northern Strands presents at Agrium Safety Fair

Northern Strands delivers presentations on Safety with Rigging at the Agrium Safety Fair.  These presentations included aspects of rigging inspections, examples of rejections and the do's and don'ts of rigging safety.  Northern Strands provided a test bed to perform breaks on lifting slings as part of the presentation.

The test bed demonstration:

New web and wire rope slings ( 3/8 x 6ft and 1” 1ply and 2ply ) were supplied for demonstration. Agrium also supplied Northern Strands with 10-12 used wire rope and web slings in varying degrees of degradation. All new slings were benchmarked to have breaking load 5 x Working load limit. All new slings broke above this benchmark. The used slings broke all over the map. Some of the new slings were given a knot and then tested with an expected 50% reduction in breaking load. Slings with knots were 40% to 60% of benchmark. Hitches were also tested ( Choker style ) there were consistent breaks near calculated load. We did have a number of eye breaks on new web and wire rope slings but above projected breaking point.

Approx. 300 people attended the presentations and were very interested in the demonstration results

Some of the comments overheard were along the lines of: Who'd of thought...I didn't know that...great to see what we only read about before....guess we don't do that anymore.

The comments were very positive and it's very likely Northern Strands will be asked by Agrium to give additional presentations on Safety with Rigging at the Agrium Safety Fair next year. 

Northern Strands is proudly Saskatoon, Saskatchewan, Canada owned and operated.

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