WLL and SWL are abbreviatons for Working Load Limit (WLL) and Safe Working Load (SWL). The main difference between the two terms is that SWL is the older term. Today, SWL isn’t used anymore because the term is completely replaced with WLL and MRC.
What is the difference between Working Load Limit (WLL) and SWL?
The working load limit was previously known as the safe working load. The main difference between WLL and SWL is that the working load limit was previously known as the safe working load, hence the term WLL is in usage, whereas the term SWL has been out of use for a long time.
What is the difference between WLL and SWL in sling?
An SWL for a sling having a flexible wire rope of steel can be given. Sling SWL is equal to the SWL of rope material given in tonnes multiplied by the loading factor as well as the termination factor. WLL stands for Working Load Limit, while SWL stands for Safe Working Load. The term “WLL” is still in use, whereas SWL is not.
What does SWL mean on hardware?
But Henssgen Hardware is here for you, to educate you on terms like Working Load Limits and everything you need to know about our products. Safe Working Load, SWL, (or Normal Working Load, NWL) is an outdated term that was used to indicate the amount of weight that a lifting device could safely carry without fear of breaking.
Why is SWL not used anymore?
Today, SWL is not used anymore because it has been completely replaced by the term WLL. Let us discover the reasons why engineers put an end to using the term “safe working load.”
When did WLL replace SWL?
Around 2000, both the Americans and Europeans have agreed that Working Load Limit (WLL) should replace Safe Working Load (SWL) in describing the capacity of items such as hooks, slings and shackles etc. Other Standards detail the requirements for cranes, hoists and winches.
What does WLL mean in lifting?
Working Load LimitWWL stands for Working Load Limit. The WLL is the maximum authorized load that can be borne when working with a device.
What is the difference between MBL and SWL?
This load represents a force that is required to make the lifting equipment fail or yield, also known as the Minimum Breaking Load (MBL). SWL or WLL are calculated by dividing MBL by a safety factor (SF).
What is meant by SWL?
Safe Working Load (SWL) sometimes stated as the Normal Working Load (NWL) is the maximum safe force that a piece of lifting equipment, lifting device or accessory can exert to lift, suspend, or lower, a given mass without fear of breaking.
How is SWL calculated?
To calculate the SWL of fibre rope in kilograms, square the rope diameter (D) in millimetres (mm). For example: Diameter = 25 mm SWL (kg) = D2 (mm) SWL (kg) = D (mm) x D (mm) = 25 x 25 = 625 kg SWL (t) = 0.625 tonnes.
How do you calculate WLL?
The WLL is calculated by dividing the breaking load limit (BLL) by a safety factor (SF). An example of this would be a chain that has a BL of 2,000 lb. WLL of 400 lb. if a safety factor of 5 (5:1, 5 to 1, or 1/5) is used.
How is the SWL WLL rated capacity for multi slings determined?
It is determined by dividing the minimum breaking strength (MBS) of a component by a safety factor assigned to that type and use of equipment.
Can you exceed SWL?
Yes. Devices fitted to machines, such as cranes, which cut-out hoisting, derricking or trolleying motions, eg when the SWL is exceeded, should be regarded as part of the lifting equipment and be included in the thorough examination. This applies also to any radius/load indicator fitted to lifting equipment.
What is the difference between working load limit and capacity?
The lowest WLL for any component or set of components working together within a lift configuration determines the overall Gross Capacity for that configuration. The Working Load Limit for an individual piece of equipment is set by the equipment's manufacturer.
What is 200 pound Working Load Limit?
In the event that the failure of the equipment could pose a risk to life, the safety factor is ten. For example, if a hook has a Minimum Breaking Strength (MBS) of 1,000 pounds and a safety factor of five, then the Working Load Limit (WLL) would be 200 pounds.
What does WLL mean on a Ewp?
Working Load Limit (WLL) is the maximum working load designed by the manufacturer.
What is SWL in engineering?
The term Safe Working Load , (SWL) has been the cornerstone of engineering, particularly with respect to load carrying equipment, for many years. It was generally considered to be the minimum breaking load of a component divided by an appropriate factor of safety giving a ‘safe’ load that could be lifted or be carried.
What is WLL used for?
WLL should be used for all for all lifting devices below the crane hook. Allowance must be taken into consideration for the arrangement of the lifting devices by derating the WLL.
What is a working load limit?
Working Load Limit (WLL) is the maximum working load specified by the manufacturer. This load represents a mass or force that is much less than that required to make the lifting equipment fail or yield, (known as the Minimum Breaking Load – MBL). SWL or WLL are calculated by dividing the MBL by a safety factor ( SF ).
What is SWL in cranes?
The term SWL was changed to Rated Capacity for cranes, hoists and winches and Working Load Limit (WLL) should replace Safe Working Load (SWL) in describing the capacity of items such as hooks, slings and shackles etc.; that is for lifting devices below the crane hook, as referenced in AS4991:2004 Lifting devices.
What is the WLL of a single leg wire rope?
For example, the WLL of a single leg wire rope or chain sling in a straight pull or lift is the WLL specified by the manufacturer, however if a two leg sling consisting of two single legs is used, then the WLL is reduced depending on the included angle between the slings.
Is SWL removed from AS1418.1?
Any reference to the acronym SWL was also removed in this version of the standard. In the preface of AS1418.1 the following insight is provided into the change”
Is WLL good or bad?
The WLL is only as good as its weakest, or lowest WLL components. That is why it is essential to ensure that all components in a particular configuration match the duty required for the job.
What is SWL in engineering?
The term safe working load ( SWL) has been the cornerstone of engineering, particularly with regard to load carrying equipment, for many years. It was generally considered to be the minimum breaking load of a component divided by an appropriate factor of safety giving a ‘safe’ load that could be lifted or be carried.
What is WLL used for?
WLL should be used for all lifting devices below the crane hook. Allowance must be taken into consideration for the arrangement of the lifting devices by derating the WLL.
What is SWL in cranes?
In Australia the use of Safe Working Load ( SWL) for cranes, hoists and winches was universally used throughout all industries and referenced in legislation and the Australian Standards. The Wikipedia definition of SWL is: Safe Working Load (SWL) sometimes stated as the Normal Working Load (NWL) is the mass or force that a piece ...
What is WLL in a chain sling?
For example, the WLL of a single leg wire rope or chain sling in a straight pull or lift is the WLL specified by the manufacturer, however if a two leg sling consisting of two single legs is used, then the WLL is reduced depending on the included angle between the slings.
Is SWL removed from AS1418.1?
Any reference to the acronym SWL was also removed in this version of the standard. In the preface of AS1418.1 the following insight is provided into the change –
Is WLL good or bad?
The WLL is only as good as its weakest, or lowest, WLL components. That is why it is essential to ensure that all components in a particular configuration match the duty required for the job.
Can WLL be used on overhead bridges?
The use of WLL on overhead bridge and gantry cranes and monorails is still evident, however technically MRC should be used.
What is SWL in a product?
The specific definition for the Working Load Limit (WLL) is: The maximum mass or force which a product is authorized to support in general service when the pull is applied in-line, unless noted otherwise, with respect to the centerline of the product.
What is SWL in lifting?
Safe Working Load, SWL, (or Normal Working Load, NWL) is an outdated term that was used to indicate the amount of weight that a lifting device could safely carry without fear of breaking. It is a calculation of the Minimum Breaking Strength, or MBS. The more up-to-date phrase for the term SWL is Working Load Limit, or WLL.
What is SWL in cranes?
In the cases of cranes, hoists and winches, the term Safe Working Load (SWL) was replaced by Manufacturer’s Rated Capacity (MRC), which is the maximum gross load which may be applied to the crane or hoist or lifting attachment while in a particular working configuration and under a particular condition of used.
What is the working load limit for hooks?
For example, if a hook has a Minimum Breaking Strength (MBS) of 1,000 pounds and a safety factor of five, then the Working Load Limit (WLL) would be 200 pounds.
Why is SWL no longer used?
SWL is no longer used to identify the maximum capacity of equipment due to it being too vague and leaving it open for legal issues. The US and European standards switched to The Working Load Limit' standard shortly after.
How to calculate WLL?
The WLL is calculated by dividing MBL by a safety factor (SF). An example of this would be a chain that has a MBL of 2000 lbf (8.89 kN) would have a SWL or WLL of 400 lbf (1.78 kN) if a safety factor of 5 (5:1, 5 to 1, or 1/5) is used.