HHE report no. HHE-78-101-100, field study of heat stress at a surface coal mine, Man, West Virginia.
NIOSH 1978 Jul; :1-9
A heat stress survey of heavy equipment operators at a surface coal mine (SIC-1211) was conducted. The survey was performed at a mine in Man, West Virginia on July 20 and 21, 1978. Two coal trucks, an earth mover, and a rock truck were evaluated using wet bulb globe temperature and wet globe temperature devices. A standard for a metabolic heat production limit based on the findings of a previous NIOSH study was 153 kilocalories per hour. Environmental dry bulb temperatures were highest for the earth mover and lowest for the rock truck on July 20. Using the wet bulb globe index, the cab of the earth mover was the most hot while the cab of the rock truck was the least hot. The cab of the rock truck and the earth mover occasionally exceeded the NIOSH threshold limit value. The author concludes that operators of this type of earth mover are subjected to excessive heat stress, while operators of the rock truck experience excessive heat stress when hauling on an incline. Recommendations are implementation of a work and rest regimen, scheduling hot jobs for the coolest part of the work shift, plenty of water and replacement salt to be provided to workers, and mechanical cooling of the cab environment.
NIOSH-Author; NIOSH-Health-Hazard-Evaluation; Hazards-Confirmed; HHE-78-101-100; Region-3; Industrial-medicine; Industrial-hygiene; Metabolic-study; Heat-tolerance; Heat-acclimatization; Coal-mining
Hazard Evaluation and Technical Assistance; Field Studies
NTIS Accession No.
Hazard Evaluations and Technical Assistance Branch, NIOSH, Morgantown, West Virginia, Report No. HHE-78-101-100, 9 pages