tailieunhanh - DEFINITIONS CONVERSIONS and CALCULATIONS for OCCUPATIONAL SAFETY and HEALTH PROFESSIONALS - CH3

Nơi làm việc xung quanh Air Chương này tập trung vào nhiều yếu tố và các khía cạnh đặc trưng, hoặc là đặc tính của không khí xung quanh,. Nhấn mạnh đặc biệt được đặt trên những yếu tố và / hoặc điều kiện phải được giảm nhẹ để làm cho nơi làm việc an toàn. Các thành phần chủ yếu của bất kỳ ma trận môi trường xung quanh để được xem xét sẽ được nhiệt độ, áp suất của nó, và khối lượng cũng như hơi, hạt, và / hoặc bụi có thể sẽ được cư dân trong đó. . | Chapter 3 Workplace Ambient Air This chapter focuses on the wide variety of factors and aspects that characterize or are characteristics of ambient air. Particular emphasis is placed on those factors and or conditions that must be mitigated in order to make the workplace safe. The principal components of any ambient matrix to be considered will be its temperature pressure and volume as well as the vapors particulates and or aerosols that may be resident in it. RELEVANT DEFINITIONS Ambient Concentration Categories Threshold Limit Values The Threshold Limit Value usually abbreviated TLV refers to an ambient airborne concentration of some substance of interest and represents a condition under which it is believed that nearly all workers may be repeatedly exposed day after day without adverse effect. This concentration limit can be and is commonly expressed in one of three forms as an 8-hour Time Weighted Average TLV-TWA as a Short Term Exposure Limit TLV-STEL and as a Ceiling Value TLV-C . The overall ambient concentration concept designated by the term or phrase Threshold Limit Value was introduced and promulgated by the American Conference of Government Industrial Hygienists the ACGIH . Currently established TLVs are always under review and individual listings are modified whenever relevant new information dictates that this be done. Permissible Exposure Limits The Permissible Exposure Limit usually abbreviated PEL is an ambient airborne concentration of some substance of interest which the Occupational Safety and Health Administration OSHA which is a branch of the . Department of Labor USDOL had adopted largely from data furnished earlier by the ACGIH in the development of this organization s listing of Threshold Limit Values. The initial listing of these Permissible Exposure Limits was made in the Z-Tables of Title 29 Code of Federal Regulations usually abbreviated CFR Part as published in the Federal Register on January 19 1989. Currently published .