(solution) Question: I need help with an LIFTING ANALYSIS WORKSHEET. A

Question:

I need help with an LIFTING ANALYSIS WORKSHEET.

A worker is lifting a box from a starting vertical height of 34 inches and placing the box at a vertical destination above the shoulders, approximately 65 inches high. The box is held reasonably close to his body (use best case of 10 inches). The shape of the box is good, but there are no cut-outs or handles for the hands, so the hand-to-container coupling classification is fair. The worker is performing the lift with little asymmetry. The worker handles approximately 4 boxes per minute and is lifting these 50 pound boxes throughout his eight hour shift.

With these conditions, calculate the recommended weight limit (RWL) at the origin and at the destination. Then, calculate the lifting index (LI) at the origin and at the destination.

Print the NIOSH worksheet and complete the values on the worksheet. On a separate sheet, address the following issues:

1. Show how you derived or obtained each of the values for the variables in the worksheet.
2. What do the calculated LI values indicate about the potential hazard of the task?
3. Make some recommendations on how to reduce the potential hazard. How would these recommendations numerically reduce the values obtained in the worksheet? What would the revised LI values be with these modifications?

• lift.pdf

LIFTING ANALYSIS WORKSHEET
DEPARTMENT JOB DESCRIPTION JOB TITLE
ANALYST?S NAME
DATE STEP 1. Measure and record task variables
Object Weight
(lbs)
L(AVG) L(MAX) Hand Location
Origin
H Vertical
Distance Dest V H V Asymmetric Angle (deg.) D Frequency Rate Duration
Hrs Origin Destination lifts/min A A F C STEP 2. Determine the multipliers and compute the RWLs
RWL = LC x HM x VM x DM x AM x FM ORIGIN RWL = 51 x x x x x x DEST. RWL = 51 x x x x x x Object
Coupling x CM
~ ~ STEP 3. Compute the LIFTING INDEX
ORIGIN LIFT INDEX OBJECT WEIGHT =
RWL = DESTINATION LIFT INDEX OBJECT WEIGHT =
RWL = Table 1
Horizontal Multiplier H HM in H HM cm &lt; 10 1.00 &lt; 25 1.00 11 .91 28 .89 12 .83 30 .83 13 .77 32 .78 14 .71 34 .74 15 .67 36 .69 16 .63 38 .66 17 .59 40 .63 18 .56 42 .60 19 .53 44 .57 20 .50 46 .54 21 .48 48 .52 22 .46 50 .50 23 .44 52 .48 24 .42 54 .46 25 .40 56 .45 &gt; 25 .00 58 .43 60 .42 63 .40 &gt; 63 .00 Table 2
Vertical Multiplier V VM in V VM cm 0 .78 0 .78 5 .81 10 .81 10 .85 20 .84 15 .89 30 .87 20 .93 40 .90 25 .96 50 .93 30 1.00 60 .96 35 .96 70 .99 40 .93 80 .99 45 .89 90 .96 50 .85 100 .93 55 .81 110 .90 60 .78 120 .87 65 .74 130 .84 70 .70 140 .81 &gt;70 .00 150 .78 160 .75 170 .72 175 .70 &gt;175 .00 Table 3
Distance Multiplier
D DM in D DM cm &lt;10 1.00 &lt;25 1.00 15 .94 40 .93 20 .91 55 .90 25 .89 70 .88 30 .88 85 .87 35 .87 100 .87 40 .87 115 .86 45 .86 130 .86 50 .86 145 .85 55 .85 160 .85 60 .85 175 .85 70 .85 &gt;175 .00 &gt;70 .00 Table 4
Asymmetric Multiplier
A AM deg
0 1.00 15 .95 30 .90 45 .86 60 .81 75 .76 90 .71 105 .66 120 .62 135 .57 &gt;135 .00 Table 5
Frequency Multiplier Table (FM)
Work Duration Frequency
Lifts/min
(F) ? &lt; 1 Hour &gt; 1 but &lt; 2 Hours &gt; 2 but &lt; 8 Hours V &lt; 30 ? V &gt; 30 V &lt; 30 V &gt; 30 V &lt; 30 V &gt; 30 &lt; 0.2 1.00 1.00 .95 .95 .85 .85 0.5 .97 .97 .92 .92 .81 .81 1 .94 .94 .88 .88 .75 .75 2 .91 .91 .84 .84 .65 .65 3 .88 .88 .79 .79 .55 .55 4 .84 .84 .72 .72 .45 .45 5 .80 .80 .60 .60 .35 .35 6 .75 .75 .50 .50 .27 .27 7 .70 .70 .42 .42 .22 .22 8 .60 .60 .35 .35 .18 .18 9 .52 .52 .30 .30 .00 .15 10 .45 .45 .26 .26 .00 .13 11 .41 .41 .00 .23 .00 .00 12 .37 .37 .00 .21 .00 .00 13 .00 .34 .00 .00 .00 .00 14 .00 .31 .00 .00 .00 .00 15 .00 .28 .00 .00 .00 .00 &gt; 15 .00 .00 .00 .00 .00 .00 ? Values of V are in inches. ? For lifting less frequently than once per 5 minutes, set F = 2
lifts/minute.