Recommended
Weight Limit
Easier Ways to Manually Lift, Lower,
Fill, or Empty Containers
Low back pain
and injuries
attributed to manual lifting activities continue as one of the leading
occupational health and safety issues. Despite efforts to control,
including programs directed at both workers and jobs, the National
Institute for Occupational Safety and Health (NIOSH) says that work
related back injuries still account for a significant proportion of
human suffering and economic cost.
According to the Dept. of Labor, back injuries account
for nearly 20 percent of all injuries and illnesses in the workplace,
and nearly 25 percent of annual workers’ compensation payments.
Over exertion is the most common cause of these injuries
and NIOSH offers the following guidance. When lifting, lowering, filling
or emptying containers, consider the
following
options that will:
• Reduce reaching and bending;
• Reduce the stress on your back and shoulders;
• Reduce the effort and force needed to perform work
tasks.
NIOSH’s Lifting Equation provides guidelines for
evaluating two-handed manual lifting tasks. It defines a Recommended
Weight Limit (RWL) as the weight of the load that nearly all healthy
workers can lift over a substantial period of time (e.g., eight hours)
without an increased risk of developing lower back pain.
The maximum weight to be lifted with two hands, under
ideal conditions, is 51 pounds. The RWL is based on six variables that
reduce the maximum weight to be lifted to less than 51 pounds.
NIOSH says that management should
also consider the following to ensure the continued health of those who
must lift heavy objects on the job:
• Plan the workflow to eliminate
unnecessary lifts;
• Organize the work so that the
physical demands and work pace increase gradually;
• Minimize the distances loads are
lifted and lowered;
• Position pallet loads of materials
at a height that allows workers to lift and lower within their power
zone;
• Avoid manually lifting or lowering
loads to or from the floor;
• Store materials and/or products off
the floor;
• Arrange materials to arrive on
pallets, and keep materials on pallets during storage;
• Use a forklift to lift or lower the
entire pallet of material, rather than lifting or lowering the material
individually;
• Arrange to have material off-loaded
directly onto storage shelves. Store only lightweight or infrequently
lifted items on the floor;
• Use mechanical devices (e.g.,
lifts, hoists) whenever possible;
• Avoid designing jobs that require
workers to lift or lower materials to or from floor level.
For loads that are unstable and/or
heavy, management should:
• Tag the load to alert workers;
• Test the load for stability and
weight before carrying the load;
• Use mechanical devices or equipment
to lift the load;
Reduce the weight of the load by:
• Putting fewer items in the
container;
• Using a smaller and/or
lighter-weight container;
• Repack containers so contents will
not shift and the weight is balanced;
• Use team lifting as a temporary
measure for heavy or bulky objects;
Reduce the frequency of lifting and
the amount of time employees perform lifting tasks by:
• Rotating workers in lifting tasks
with other workers in non-lifting tasks;
• Having workers alternate lifting
tasks with non-lifting tasks;
• Clear spaces to improve access to
materials or products being handled. Easy access allows workers to get
closer and reduces reaching, bending, and twisting.
The use of stretching is appropriate
as part of a comprehensive ergonomic program, but it must not be used in
place of engineering and/or administrative improvements.
• Check for tags on loads.
• Before lifting, always test the
load for stability and weight.
For loads that are unstable and/or
heavy, follow management guidelines for:
• Equipment use;
• Reducing the weight of the load;
• Repacking containers to increase
stability.
Plan the lift:
• Wear appropriate shoes to avoid
slips, trips, or falls.
• If you wear gloves, choose the size
that fits properly. Depending on the material the gloves are made of and
the number of pairs worn at once, more force may be needed to grasp and
hold objects. For example, wearing a single pair of heat-resistant
gloves can reduce your grip strength up to 40 percent.
Wearing two or more pairs of gloves
at once can reduce your grip strength up to 60 percent.
• Lift only as much as you can safely
handle by yourself.
• Keep the lifts in your power zone
(i.e., above the knees, below the shoulders, and close to the body), if
possible.
• Use extra caution when lifting
loads that may be unstable.
When lifting:
• Get a secure grip;
• Use both hands whenever possible;
• Avoid jerking by using smooth, even
motions;
• Keep the load as close to the body
as possible;
• To the extent feasible use your
legs to push up and lift the load, not the upper body or back;
• Do not twist your body. Step to one
side or the other to turn;
• Alternate heavy lifting or forceful
exertion tasks with less physically demanding tasks;
• Take rest breaks.
FSM