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CHLORINE BASICS 31 CONFINED SPACE ENTRY TIPS Suitable respiratory and other protective equipment for anyone entering the confined space; Safety harness and lifeline for all workers in the confined space; Supervision of the operation from outside the confined space at all times; No entry for rescues without appropriate respiratory protection, safety harness, lifeline and backup personnel; See OSHA standard 29 CFR1901.164. 6.4 PERSONAL EXPOSURE MONITORING Because the odor of chlorine in itself is an inadequate indicator of concentration, it is essential that some quantitative measure of exposure be determined. Exposure guidelines are listed on the SDS, including OSHA PEL and American Conference of Governmental Industrial Hygienists (ACGIH) TLV. 7. MEDICAL ASPECTS AND FIRST AID 7.1 HAZARDS TO HEALTH Chlorine gas is primarily a respiratory irritant. At low concentrations, chlorine gas has an odor similar to household bleach. As the concentrations increase from the level of detection by smell, so do the symptoms in the exposed individual. Depending on the level of exposure to chlorine, the effects may become more severe for several days after the incident. Observations of exposed individuals should be considered part of the medical response program. The following list is a compilation of potential chlorine exposure thresholds and potential responses in humans, with considerable variation among subjects: Table 7.1 0.2 – 0.4 Less than 0.5 0.5 1 Chlorine Exposure Thresholds, Limits, and Guidelines (ppm) Odor threshold (decrease in odor perception occurs over time) No known acute or chronic effect ACGIH TLV-TWA (8-hour time-weighted average) OSHA PEL (ceiling) ACGIH TLV-STEL (15 minutes) AIHA ERPG-1: The maximum airborne concentration below which it is believed that nearly all individuals could be exposed for up to 1 hour without experiencing other than mild transient adverse health effects or perceiving a clearly defined, objectionable odor.PDF Image | Chlorine Basics 8
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