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In the packing department, a worker stands sideways between the end of a conveyor and a pallet. The surface of the conveyor is 40 in from the floor, and the top of the pallet is 6 in from the floor. As a box moves to the end of the conveyor, the worker twists 90 degrees to pick up the box, then twists 180 degrees in the opposite direction and sets the box down on the pallet. Each box is 12 in on a side and weighs 25 lbs.

Assume the worker moves five boxes per minute for an 8 hr shift and a horizontal distance of 12 in.

Using the NIOSH lifting equation, calculate the RWL and LI.

Redesign the task to improve it. Given your redesign, what are the RWL and LI now?

Answer :

Using the NIOSH lifting equation, RWL = 49.41 lbs and LI = 0.506

The RWL and LI remain the same after the redesign because the weight of the load and other factors have not changed.

The redesigned task reduces the risk of injury by minimizing the twisting motion and the distance the worker needs to reach.

To calculate the Recommended Weight Limit (RWL) and the Lifting Index (LI) using the NIOSH lifting equation, we need to consider the various factors involved in the task.

Calculate the RWL:

First, we determine the Lifting Index (LI) for the initial task to assess if it exceeds the threshold value of 1.0, indicating a high risk of injury. If LI exceeds 1.0, the task needs to be redesigned. However, let's calculate it to assess the need for redesign.

LI = (Load Weight / RWL)

Load Weight = 25 lbs

RWL = (51 * (1 - 0.0032 * |40 - 6 - 25 * 0.25| - 0.0075 * (12 / 25) * 25))

Substituting the values:

RWL = (51 * (1 - 0.0032 * |9| - 0.0075 * 0.48))

Calculating the absolute value and performing the calculations:

RWL = (51 * (1 - 0.0032 * 9 - 0.0075 * 0.48))

RWL = (51 * (1 - 0.0288 - 0.0036))

RWL = (51 * 0.9676)

RWL = 49.41 lbs

Calculate the LI:

LI = (Load Weight / RWL)

LI = (25 / 49.41)

LI = 0.506

The LI value is less than 1.0, indicating that the initial task does not exceed the threshold for injury risk.

Redesigned Task:

To improve the task and reduce the risk of injury, we can implement mechanical assistance or adjust the layout to reduce the distance the worker needs to twist.

Assuming the redesign reduces the distance to half (6 in), we can recalculate the RWL and LI using the same formula as above:

RWL = (51 * (1 - 0.0032 * |9| - 0.0075 * 0.48))

RWL = 49.41 lbs

LI = (25 / 49.41)

LI = 0.506

The RWL and LI remain the same after the redesign because the weight of the load and other factors have not changed. However, the redesigned task reduces the risk of injury by minimizing the twisting motion and the distance the worker needs to reach.

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