SWL and WLL are abbreviated terms commonly used in the field of engineering.
WLL stands for Working Load Limit while
SWL stands for Safe Working Load.
The main difference between Safe Working Load from Working Load Limit is that SWL is the older term. Today, SWL is not used anymore because it has been completely replaced by the termsWLL and MRC.
MRC stands for Maximum Rated Capacity.
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 hoisted or be carried.
A definition of SWL was:
Let us discuss the reasons why engineers put an end to using the term Safe Working Load.
In the early nineties the USA ceased using this term, because of legal implications.
The European and ISO Standards followed suit a few years later. However, while this was a clean-cut move, for some time, there has been indecision as to exactly what replacement terms could be used. Around 2000, both the Americans and Europeans 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.
One of the the revisions in 2002 included replacing the term Safe Working Load with Rated Capacity. The term Safe Working Load was changed to Rated Capacity for cranes, hoists and winches and Working Load Limit should replace Safe Working Load in describing the capacity of items such as hooks, slings and shackles etc.; that is for hoisting devices below the crane hook.
When used on a crane, hoist or winch, the Rated Capacity includes the weight of any attachments, spreader beams, or hoisting devices below the crane hook and is the maximum allowable hoisting capacity of the crane, hoist, or winch when the hoist is a straight line pull.
MRC is often called the Manufacturers Rated Capacity or Maximum Rated Capacity to avoid any confusion with maximum gross load.
WLL stands for Working Load Limit while
SWL stands for Safe Working Load.
The main difference between Safe Working Load from Working Load Limit is that SWL is the older term. Today, SWL is not used anymore because it has been completely replaced by the termsWLL and MRC.
MRC stands for Maximum Rated Capacity.
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 hoisted or be carried.
A definition of SWL was:
Let us discuss the reasons why engineers put an end to using the term Safe Working Load.
In the early nineties the USA ceased using this term, because of legal implications.
The European and ISO Standards followed suit a few years later. However, while this was a clean-cut move, for some time, there has been indecision as to exactly what replacement terms could be used. Around 2000, both the Americans and Europeans 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.
One of the the revisions in 2002 included replacing the term Safe Working Load with Rated Capacity. The term Safe Working Load was changed to Rated Capacity for cranes, hoists and winches and Working Load Limit should replace Safe Working Load in describing the capacity of items such as hooks, slings and shackles etc.; that is for hoisting devices below the crane hook.
When used on a crane, hoist or winch, the Rated Capacity includes the weight of any attachments, spreader beams, or hoisting devices below the crane hook and is the maximum allowable hoisting capacity of the crane, hoist, or winch when the hoist is a straight line pull.
MRC is often called the Manufacturers Rated Capacity or Maximum Rated Capacity to avoid any confusion with maximum gross load.
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