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Chemical Hygiene OfficerDavid A. Zei
Manager of Laboratory FacilitiesDavid Caspary
CHP is an acronym for ...Chemical Hygiene Plan
Chemical Hygiene Plandefined by Michigan OSHA as a written program which sets forth procedures, and describes equipment, personal protective equipment and work practices that minimize exposure to health hazards presented by hazardous chemicals used in that particular workplace.
This manual is also designed to meet the requirements of the following regulationsHazardous Chemicals in Laboratories, Chemical Hygiene Plan, Occupational Exposure to Hazardous Chemicals in Laboratories, Hazard Communication
NFPA RatingsH – Health, F – Flammability, S – Stability, Sp. – Special
PELsPermissible Exposure Levels
TLVsThreshold Limit Values
This instruction is designed to meet the following regulatory requirements:Hazardous Work in Laboratories, Chemical Hygiene Plan, Occupational Exposure to Hazardous Chemical in Laboratories, Hazard Communication
The following operations will require special approval by either the Chemical Hygiene Officer (CHO) or the Manager of Laboratory Facilities prior to operation. This is in addition to the Standard Operating Procedure (SOP) and safety review that must be completed.Use or storage of any regulated chemicals, Temperatures exceeding 1000oC, or any temperatures exceeding equipment design or specifications., Pressures exceeding 35 atm (515 psi), or any pressures exceeding equipment design or specifications., Class 3 or Class 4 lasers.
Medical examinations are required for the following:Personnel using respiratory protection., Documented exposures above established action levels (including noise, lasers, ionizing radiation, etc), or for airborne concentrations above one-half of the PEL, TLV, or other recognized exposure limit., Personnel exhibiting signs or symptoms consistent with exposure to the chemicals or hazards with which they are working., Personnel exposed to hazardous chemicals or hazards as a result of a spill, leak, or explosion.
Chemical exposure hazards are determined using ...Threshold Limit Values (TLV's) and Permissable Exposure Levels (PEL's).
Flammability hazards are determined using...flashpoints for liquids, and upper and lower flammability limits.
PEL'sPermissable Exposure Levels
Threshold Limit Values (TLV)The American Conference of Governmental Industrial Hygienists (ACGIH) has established threshold doses, called threshold limit values (TLVs), for a large number of chemical agents. The TLV refers to airborne concentrations that correspond to conditions under which no adverse effects are normally expected during a worker’s lifetime. The exposure occurs only during normal working hours, eight hours per day and five days per week.
TLV-TWATime weighted average for a normal 8-hour workday or 40 hour workweek, to which nearly all workers can be exposed, day after day, without adverse effects. Excursions above the limit are allowed if compensated by excursions below the limit.
TLV-STELShort-term exposure limit. The maximum concentration to which workers can be exposed for a period of up to 15-minutes continuously without suffering (1) intolerable irritation, (2) chronic or irreversible tissue damage, (3) narcosis of sufficient degree to increase accident proneness, impair self rescue, or materially reduce worker efficiency, provided that no more than four excursions per day are permitted, with at least 60-minutes between exposure periods, and provided that the daily TLV-TWA is not exceeded.
TLV-CCeiling limit. The concentration which should not be exceeded, even instantaneously.
Permissible Exposure Level (PEL)Same as TLV-TWA, but defined by OSHA.