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OPERATING PROCEDURES NO. HS-102 <br /> 102 .0 HEAT STRESS <br /> 102 . 1 PURPOSE <br /> The purpose of this OP is to provide general information <br /> on heat stress and the methods that can be utilized to prevent or <br /> minimize the occurrence of heat stress. <br /> Adverse climatic conditions are important considerations <br /> in planning and conducting site operations. Ambient temperature <br /> effects can include physical discomfort, reduced efficiency, <br /> personal injury, and increased accident probability. Heat stress <br /> is of particular concern while wearing impermeable protective <br /> garments, since these garments inhibit evaporative body cooling. <br /> 102 . 2 REQUIREMENTS <br /> The NIOSH criteria document for heat stress recommends <br /> that environmental monitoring and other preventive measures be <br /> adopted in hot work environments. However, the provisions are not <br /> directly applicable to employees who are required to wear <br /> irpermeable protective clothing. The reason for this exception is <br /> that impermeable clothing prevents the evaporation of sweat, which <br /> is one of the most important cooling mechanisms of the body. There <br /> is no recognized health standard protection for workers wearing <br /> impermeable protective clothing and respirators in hot <br /> environments. <br /> The ACGIH has adopted a TLV for heat stress. These <br /> guides relate to work/rest regimes. <br /> 1 D797 . 8/72 HS-102-1 November 1990 <br />