NIOSH Lifting Guide. Considering the work of airport baggage handlers working on the tarmac who are...

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NIOSH Lifting Guide. Considering the work of airport baggage handlers working on the tarmac who are responsible for loading luggage from a trolley (start of the lift, Condition A) onto the conveyor belt (end of the lift, Condition B) which feeds into the cargo hold of the airplane. Consider the following measurements describing Conditions A and B for a job duration of 100 minutes per day. + Task variable Condition A - start Condition B - end Horizontal dist. 21 cm 40 cm Vertical dist. 80 cm 60 cm Asymmetry 25 degrees 60 degrees Frequency of lift 3 lifts/min Coupling Fair (1pt) State the major assumption in this case: (6pts) Calculate the recommended weight limit (RWL). See graphs for multipliers Multiplier 1.2 1 0.8 0.6 0.4 0.2 0 20 30 40 50 60 Horizontal Distance (cm) 70 80 Multiplier 1.2 1 0.8 0.6 0.4 0.2 0 0 20 20 40 10 60 80 100 120 140 160 180 Vertical Distance (cm) Multiplier 1.2 1 0.8 0.6 0.4 0.2 0 0 20 20 40 60 80 100 120 140 160 180 Distance Moved (cm) Multiplier 1.2 1 0.8 0.6 0.4 0.2 0 20 40 60 80 100 120 140 160 180 Asymmetry Angle (deg) lh Work Duration 2h Frequency V <75cm V75cm V <75cm V>75cm V <75cm 8h V>75cm lifts/min 0.2 1.00 1.00 0.95 0.95 0.85 0.85 0.5 0.97 0.97 0.92 0.92 0.81 0.81 1 0.94 0.94 0.88 0.88 0.75 0.75 2 0.91 0.91 0.84 0.84 0.65 0.65 3 0.88 0.88 0.79 0.79 0.55 0.55 4 0.84 0.84 0.72 0.72 0.45 0.45 5 0.80 0.80 0.60 0.60 0.35 0.35 6 0.75 0.75 0.50 0.50 0.27 0.27 7 0.70 0.70 0.42 0.42 0.22 0.22 8 0.60 0.60 0.35 0.35 0.18 0.18 9 0.52 0.52 0.30 0.30 0.00 0.15 10 0.45 0.45 0.26 0.26 0.00 0.13 11 0.41 0.41 0.00 0.23 0.00 0.00 12 0.37 0.37 0.00 0.21 0.00 0.00 13 0.00 0.34 0.00 0.00 0.00 0.00 14 0.00 0.31 0.00 0.00 0.00 0.00 15 0.00 0.28 0.00 0.00 0.00 0.00 >15 0.00 0.00 0.00 0.00 0.00 0.00 Source: Waters, T.R., Putz-Anderson, V., Garg, A., and Fine, L. (1993). Revised NIOSH equation for the design and evaluation of manual lifting tasks, Ergonomics, 36,7,749-76. Table 13.2 Frequency Multiplier (FM) (Note: 75cm = 30 inches) Coupling multipliers Couplings V <75 cm (30 in.) V 75 cm (30 in.) Good 1.00 1.00 Pair Fair 0.95 1.00 Poor 0.90 0.90 3- ) Calculate the Lifting Index for this job assuming an average luggage weight of 22kg. Provide detailed step-by-step calculations. Based on your computed Lifting Index, comment on the worker's risk of developing a low back disorder along with a justification in 1-2 sentences. 4- (2pts) Describe one (separate) design recommendation or change in task variable in each of the Condition's A and B that would be beneficial for reducing a worker's risk of low-back injury? (Note: the recommendations in A and B must address different task variables) NIOSH Lifting Guide. Considering the work of airport baggage handlers working on the tarmac who are responsible for loading luggage from a trolley (start of the lift, Condition A) onto the conveyor belt (end of the lift, Condition B) which feeds into the cargo hold of the airplane. Consider the following measurements describing Conditions A and B for a job duration of 100 minutes per day. + Task variable Condition A - start Condition B - end Horizontal dist. 21 cm 40 cm Vertical dist. 80 cm 60 cm Asymmetry 25 degrees 60 degrees Frequency of lift 3 lifts/min Coupling Fair (1pt) State the major assumption in this case: (6pts) Calculate the recommended weight limit (RWL). See graphs for multipliers Multiplier 1.2 1 0.8 0.6 0.4 0.2 0 20 30 40 50 60 Horizontal Distance (cm) 70 80 Multiplier 1.2 1 0.8 0.6 0.4 0.2 0 0 20 20 40 10 60 80 100 120 140 160 180 Vertical Distance (cm) Multiplier 1.2 1 0.8 0.6 0.4 0.2 0 0 20 20 40 60 80 100 120 140 160 180 Distance Moved (cm) Multiplier 1.2 1 0.8 0.6 0.4 0.2 0 20 40 60 80 100 120 140 160 180 Asymmetry Angle (deg) lh Work Duration 2h Frequency V <75cm V75cm V <75cm V>75cm V <75cm 8h V>75cm lifts/min 0.2 1.00 1.00 0.95 0.95 0.85 0.85 0.5 0.97 0.97 0.92 0.92 0.81 0.81 1 0.94 0.94 0.88 0.88 0.75 0.75 2 0.91 0.91 0.84 0.84 0.65 0.65 3 0.88 0.88 0.79 0.79 0.55 0.55 4 0.84 0.84 0.72 0.72 0.45 0.45 5 0.80 0.80 0.60 0.60 0.35 0.35 6 0.75 0.75 0.50 0.50 0.27 0.27 7 0.70 0.70 0.42 0.42 0.22 0.22 8 0.60 0.60 0.35 0.35 0.18 0.18 9 0.52 0.52 0.30 0.30 0.00 0.15 10 0.45 0.45 0.26 0.26 0.00 0.13 11 0.41 0.41 0.00 0.23 0.00 0.00 12 0.37 0.37 0.00 0.21 0.00 0.00 13 0.00 0.34 0.00 0.00 0.00 0.00 14 0.00 0.31 0.00 0.00 0.00 0.00 15 0.00 0.28 0.00 0.00 0.00 0.00 >15 0.00 0.00 0.00 0.00 0.00 0.00 Source: Waters, T.R., Putz-Anderson, V., Garg, A., and Fine, L. (1993). Revised NIOSH equation for the design and evaluation of manual lifting tasks, Ergonomics, 36,7,749-76. Table 13.2 Frequency Multiplier (FM) (Note: 75cm = 30 inches) Coupling multipliers Couplings V <75 cm (30 in.) V 75 cm (30 in.) Good 1.00 1.00 Pair Fair 0.95 1.00 Poor 0.90 0.90 3- ) Calculate the Lifting Index for this job assuming an average luggage weight of 22kg. Provide detailed step-by-step calculations. Based on your computed Lifting Index, comment on the worker's risk of developing a low back disorder along with a justification in 1-2 sentences. 4- (2pts) Describe one (separate) design recommendation or change in task variable in each of the Condition's A and B that would be beneficial for reducing a worker's risk of low-back injury? (Note: the recommendations in A and B must address different task variables)