Design Specifications for Respiratory Breathing Devices for Firefighters.

摘要

The desired protective factor for self-contained breathing apparatus used in the fire service is proposed at 100based on a series of tests with a personal air sampler which revealed maximum air concentrations of carbon monoxide of approximately 20,000PPM during fire fighting episodes. A series of 74incidents was studied using a combustible gas detector modified to be specific for carbon monoxide. The data are recorded on a cassette recorder using a voltage to frequency converter. A study of the respiratory minute volume during active work while wearing open-circuit,self-contained breathing apparatus indicated a median value of 60liters per minute and 70liters for the 80per centile group. If the device is to have a service life of 30minutes,the stored air capacity must be 1800liters,and 2100liters for the median and 80percentile values respectively.