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KLE/NFELOER (�H e a l t h& Safety Procedure HSP-5-08 Version 10 HEAT STRESS Number: Number: Published 5/4/2018 Revised N/A Date: Date: to a compressed air source that feeds cool air into the jacket or coveralls through a vortex tube. Another type of garment is a plastic jacket which has pockets that can be filled with dry ice or containers of ice. 5-08.6.7 Heat Stress Monitoring For monitoring the body's recuperative ability to excess heat, one or more of the following techniques will be used as a screening mechanism. Monitoring of personnel wearing impermeable chemical protective clothing should commence when the ambient air temperature is 70 degrees Fahrenheit or above. Frequency of monitoring should increase as the ambient air temperature increases or if slow recovery rates are indicated. When temperatures exceed 80 degrees Fahrenheit, workers will be evaluated for signs of heat stress during and after every work period. Another technique that may be implemented is checking pulse rate. Resting pulse rate is proportional to internal core temperature and provides an approximate indication of the level of heat stress. If a worker's pulse rate is above 110 beats per minute (BBM) after a rest period, the worker should not re-enter the hot environment until the resting pulse rate is below 110 BBM. This may necessitate more frequent or longer break periods where heat stress is a concern. 5-08.6.8 Heat Index To determine the heat index, find the outside temperature (in degrees Fahrenheit) in the left column of the heat index chart. On the top line, find the dew point (in degrees Fahrenheit). Then read down the dew point column and across the temperature row to where the two axes intersect to find the heat index. For example, if the outside temperature is 80OF and the dew point is 65.0°F, the heat index is 82.8. The comfort index can be roughly determined from the heat index by comparing the heat index number with the data in the summary below. Any value less than 80 is considered comfortable. Any value greater than 90 is considered extreme. Any value greater than 100 is considered hazardous. Any value greater than 110 is considered dangerous. Copyright 2019 Kleinfelder, Inc. Page 7 of 9 Important: When modifying this document, update properties with your name, date, and nature of changes made.