NIOSH Lifting Equation submitted by William A. Groves - ppt video ... - Free Printable

The image provided is a Job Analysis Worksheet used for analyzing lifting tasks, likely based on the Niosh Lifting Equation. This equation helps assess the risk of injury associated with manual lifting tasks by calculating the Recommended Weight Limit (RWL) and the Lifting Index (LI).

Steps to Solve the Problem:

#### Step 1: Measure and Record Task Variables
This step involves collecting data about the task variables, such as:
- Object Weight (lbs): Average weight (`L(AVG)`) and maximum weight (`L(MAX)`).
- Hand Location (in): Horizontal (`H`) and vertical (`V`) distances from the origin and destination.
- Asymmetric Angle (degrees): The angle at which the lift is performed.
- Frequency Rate (lifts/min): How often the lift is performed.
- Duration (hours): Total time spent performing the task.
- Object Coupling: How well the object can be gripped.

These values are recorded in the table provided in Step 1.

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#### Step 2: Determine the Multipliers and Compute the RWL's
The Recommended Weight Limit (RWL) is calculated using the Niosh Lifting Equation:

\[
\text{RWL} = LC \times HM \times VM \times DM \times AM \times FM \times CM
\]

Where:
- LC (Load Constant): A constant value of 51 lbs.
- HM (Horizontal Multiplier): Depends on the horizontal distance.
- VM (Vertical Multiplier): Depends on the vertical distance.
- DM (Distance Multiplier): Depends on the horizontal and vertical distances combined.
- AM (Asymmetric Multiplier): Depends on the asymmetric angle.
- FM (Frequency Multiplier): Depends on the frequency of lifting.
- CM (Coupling Multiplier): Depends on how well the object can be gripped.

Each multiplier is determined based on specific tables or formulas provided by Niosh. Once all multipliers are calculated, they are multiplied together along with the Load Constant (51 lbs) to get the RWL.

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#### Step 3: Compute the Lifting Index (LI)
The Lifting Index (LI) is calculated using the formula:

\[
\text{LI} = \frac{\text{OBJECT WEIGHT (L)}}{\text{RWL}}
\]

Where:
- OBJECT WEIGHT (L): The average weight of the object being lifted (`L(AVG)`).
- RWL: The Recommended Weight Limit calculated in Step 2.

The LI indicates the relative risk of the lifting task:
- LI ≤ 1: Low risk (safe lifting conditions).
- LI > 1: High risk (unsafe lifting conditions).

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Explanation of the Solution:

1. Step 1: Collect all necessary data about the task variables (e.g., object weight, hand location, asymmetric angle, frequency, etc.). This data will be used in subsequent steps.

2. Step 2: Use the collected data to determine each multiplier:
- HM, VM, DM, AM, FM, CM: These are calculated using Niosh's guidelines or lookup tables.
- Multiply these multipliers with the Load Constant (51 lbs) to get the RWL for both the origin and destination.

3. Step 3: Calculate the Lifting Index (LI) for both the origin and destination using the formula:
\[
\text{LI} = \frac{\text{OBJECT WEIGHT (L)}}{\text{RWL}}
\]
Compare the LI values to determine if the task is safe (`LI ≤ 1`) or risky (`LI > 1`).

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Final Answer:

To solve the problem, you need to:
1. Fill in the task variables in Step 1.
2. Use the task variables to calculate the multipliers and compute the RWL in Step 2.
3. Use the object weight and RWL to compute the Lifting Index (LI) in Step 3.

If you provide the specific data for the task variables, I can help calculate the exact values for RWL and LI. Otherwise, the general approach is outlined above.

Final Answer:
\boxed{\text{Follow the steps outlined above to complete the worksheet.}}