Ergonomics and design issues with prill trucks

Abstract

Access design features of four prill trucks were evaluated to determine musculoskeletal disorder risk factor exposures of powder crews. Evaluations consisted of crew interviews, videotaping of tasks, physical measurements and comparison of design features with standard specifications. Observed exposures included forceful exertions, awkward postures, forceful gripping and ground impact forces. Crew interviews indicated each of the four trucks had both positive and negative design features. Even though the trucks were manufactured between 1992 and 2002, the later models still had design features that encouraged work practices resulting in risk factor exposures. Access systems met some of the specifications for either ladder, step ladder or stairway requirements; access systems were often a combination of access systems. In absence of regulatory design standards, improvements can be accomplished by interviewing employees regarding the interface between the worker and existing equipment, and by following relevant standard specifications for a single access system.