Postural discomfort analysis of EOT crane operators

Abstract

Ergonomics aims at ensuring good fit between the worker and the work station. It is an important field of research in the development process to increase safety, comfort and performance. A comfortable work station can help employees to work more efficiently and effectively by reducing the probability for Musculoskeletal Disorders (MSDs). This study has been carried out to evaluate the postural discomfort of Electric Overhead Travelling (EOT) crane operators in tubular products shop of a boiler manufacturing company located in southern India. The modified Cornell Musculoskeletal Discomfort Questionnaire (CMDQ) is used to interact with 67 crane operators, working with 24 EOT cranes of three different models in alternative shifts. The study revealed that 48(71.6%) employees suffered with some kind of MSDs. Most of them suffered with lower back pain followed by neck pain. The discomfort level is increased with age. Sixteen anthropometric dimensions are measured from all the operators. Statistical analysis is carried out using ANOVA. Frequent working postures are analysed by RULA, using Egrofellow-3 software. The obtained RULA score is 6. Suitable ergonomic chair provided for comfortable sitting and front side cabin guard height 100mm reduced to increase the visibility. After 3 months of trail run again questionnaire survey is conducted which clearly indicates that discomfort level drastically reduced and RULA score also reduced to 3.