Lifting weight limits

The objective of the equation is to prevent or reduce the occurrence of low back pain among workers. Occupational safety and health practitioners use the equation to evaluate lifting demands and as an empirical method to compute a weight limit for manual lifting tasks. 

Figure 15-2. Illustration of dimension involved in a lifting task and then used in calculating the Recommended Weight Limit (RWL).

Require lifting aids, whether mechanical ones or coworkers, when exceeding NIOSH-recommended weight limits. 

Roll-off and drop-off hoists that are used to remove containers have weight limits. The hoist will not be able to lift containers that exceed these limits. 

The NIOSH equation determines the Recommended Weight Limit (RWL) as from six reduction factors from the constant of load. It is the Lifting Index (LI) that determines and quantifies the risk of musculoskeletal injury. 

The Lifting Index (LI) for posture and load calculated with the hands placed at 19 cm from the ground was 2.30 for men and 2.78 for women, both classified as High Risk to the lifting a fertilizer bag with 25.0 kg and resulting in a Recommended Weight Limit (RWL) of the order of 11.0 and... 

ABSTRACT A proper JHA requires much more than observing a job to see if it looks hard . The purpose of this study is to break down a task into its component steps, determine the hazards associated with each step, and focus on the ergonomic connection of those hazards. In order to quantify the risks of musculoskeletal disorders, we calculated lifting tasks and compared those to minimal averages. The results indicated that multiple job tasks were in excess of the recommended weight limits for those tasks. Implementing controls is necessary for reduction of these injuries. 

After breaking this task down, it was evident that it consisted of risk factors such as repetitive motion, awkward posture and foree. Quantification also assisted in determining that this job was in need of ergonomic improvements. Using the revised NIOSH lifting equation, we calculated the recommended weight limit for the rotor inspection and stacking. Specifically, we chose the worst position for the task. 

After calculating the back compressive force for the lift, we decided to run the NIOSH RLE. Although this equation is not intended for patient lifts, it can be used when certain conditions are met, such as the patient is non-combative, the amount of weight the nurse is lifting can be estimated, the lift is smooth, and the lift is fairly consistent. When used for a patient lift, the recommended weight limit changes from the regular 51 pounds to 35 pounds. 

Personal limitations (age, strength, fitness, girth) Nature of loads likely to be lifted (weight, size, rigidity) Position of loads... 

This paper describes an ebulliometric system for routine and special determinations of molecular weights. The system uses a simple ebulliometer, an immersion heater, and a Cottrell-type pump. Temperature sensing is by differential thermopile. Precision varies from about 1 to 6%, and values compare well with those from other laboratories and those from other methods. Values as high as 170,000 have been successfully measured. Some problems encountered in using the ebulliometric method are selection and effect of reference temperature, limitations of the vapor lift pump and a possible substitute for it, measurement of equilibrium concentrations within the operating ebulliometer, and the experimentally determined ebulliometric constant and some factors which influence its value. 

The transportation and installation of hardware is something to be considered for such installations that are in many cases remote and with poor access. The capacities of the systems involved in the present site were on the limit of conventional tracks and lifting equipment in terms of size and weight in combination with the poor access road quality. 

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