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NIOSH Lifting Guidelines

NIOSH Lifting Guidelines

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NIOSH Lifting Guidelines

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  1. NIOSH Lifting Guidelines • Easy to Apply and Widely Used Guideline • Requires No Special Equipment • Evaluates Two-Handed Lifting or Lowering Only • Assumes Worker is Not in Restricted Work Space • Does Not Apply to Seated or Kneeling Workers

  2. Required Inputs • Horizontal Distance From Load to Low Back • Vertical Location of Load at Beginning and End of Lift • Degrees from the Midline at Which the Load is Located at Beginning and End of Lift • Frequency of Lifting in Lifts Per Minute • The Duration of the Task • The Quality (or Lack of) Handles or Hand-holds • The Load Weight

  3. Calculating RWL • RWL = LC x HM x VM x DM x AM x FM x CM • Calculate RWL for Both Origin and Destination of Lift • Compare RWL-Origin to RWL-Destination and Use the Lesser (More Protective) Value

  4. The Lifting Index • Lifting Index (LI) = Load/RWL • Lifting Index of 1.00 or less is acceptable • Lifting Index of Greater than 1.00 up to 3.00 Indicates Need for Task and/or Administrative Changes • Lifting Index of Greater than 3.00 Unacceptably Hazardous - Engineering Changes Required

  5. Performing NIOSH Lifting Evaluations • Collecting Good Input Data is One of the Analyst’s Primary Tasks • Machines Can Perform the Calculations (computer, calculator, etc.) • Interpreting the Results and Identifying Solutions are the Most Crucial Steps in the Process

  6. NIOSH Lifting Evaluations are Important • Provide Objective Evaluations of Lifting Tasks • Is Widely Accepted and Respected as Valid • Are Quick and Easy to Perform, Especially With Software • Provide a Baseline To Compare Against Any Changes

  7. Example - Estimating Inputs • Task: Pick up 25 lb crate of apples and place on a 35 inch shelf • Handle locations are 6 inches from bottom of crate • Crate is 30 inches long and 14 inches wide • Crate had cut-out handles • Task is performed infrequently (less than once every five minutes) • Asymmetry is 15 degrees at both origin and destination • Task duration is 1 hour

  8. Example Task - Measuring Inputs • Measure horizontal distance (H1) and vertical distance (V1) at the origin of lift • Estimate asymmetry at origin (A1) • Measure horizontal distance (H2) and vertical distance (V2) at the destination of lift • Estimate asymmetry at destination (A2) • Select hand-hold category (good, fair, or poor) • Count the number of lifts in a given time frame, and convert to lifts per minute • Select the duration of the task: 1 hr, 2 hr, or 8 hr