What do you have to know to calculate the recommended weight limit (RWL)?

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Presentation transcript:

What do you have to know to calculate the recommended weight limit (RWL)?

First, you have to measure or assess several variables related to the lifting task. The six variables that are considered in determining the recommended weight limit (RWL) are:  the horizontal distance (H) the load is lifted (distance of hands from midpoint between ankles),  the starting height of the hands from the ground, (vertical location, V),  the vertical distance of lifting (D),  the time between lifts or frequency of lifting (F),  the angle of the load in relation to the body (e.g., straight in front of you or off to the side, A), and  the quality of the grasp or handhold based on the type of handles available (hand-to-load coupling, C).

Each of these variables is then assigned a numerical value (multiplier factor) from look-up charts. The NIOSH equation includes six multiplier factors to calculate the recommended weight limit (RWL): RWL = LC x HM x VM x DM x FM x AM x CM

A worker lifts 15 kg boxes from the table to the shelf five times an hour. Notice that there is a barrier between the worker and the box.

H (Horizontal Distance) - 50 cm V (Vertical Distance) - 75 cm D (Lifting/ carrying Distance)- 40 cm F (Frequency) - 12 min A (Angle) - 0° C (Coupling/quality of grip) - fair

 Select the multiplier factors for each component of the lifting from the tables in Calculating Recommended Weight Limit (RWL).Calculating Recommended Weight Limit (RWL)  Determine the Recommended Weight Limit for the task. Refer to Assessing Relevant Handling Factors and Calculating Recommended Weight Limit (RWL). Assessing Relevant Handling FactorsCalculating Recommended Weight Limit (RWL) –23 Kg x 0.50 x 1.00 x 0.95 x 1.00 x 1.00 x 1.00 = 10.9 kg  Compare the weight of the load against determined Recommended Weight Limit for the task.

Conclusion: The weight of the load is 15 kg. This value is higher than the weight limit of 10.9 kg. Therefore, the TASK IS DANGEROUS.

The critical component is H, the horizontal distance of the box from worker's body.  Remove the barrier to allow worker to get closer to the box.