ANSI K61.1-1999 pdf download AMERICAN NATIONAL STANDARD SAFETY REQUIREMENTS FOR THE STORAGE AND HANDLING OF ANHYDROUS AMMONIA
1.4.2 In accordance with U.S. Department of Labor, Occupational Safety and Health Administration (OSHA) regulations as set forth in 29 CFR 1910.1000 [7], an employee’s exposure to ammonia shall not exceed an 8-hour Time-Weighted Average (TWA) concentration limit of 50 ppm (35 mg/m 3 ) in contaminated air by volume during any 8-hour work shift of a 40-hour work week. The pungent odor of ammonia is readily detectable by most people and serves as its own warning. Concentrations in the range of 20 ppm to 50 ppm are readily detectable and it is therefore unlikely that any individual would become overexposed unknowingly.
1.5 Federal, state, and local regulations
1.5.1 Regulations of the DOT and OSHA are referenced in this standard.
1.5.2 Prior to April 1, 1967, the DOT regulations were promulgated by the Interstate Commerce Commission (ICC). This standard or any part thereof shall not be construed by the user as recommending action in any manner that is not in full compliance with applicable federal, state, and local laws and regulations that are in effect at any given time. 1.6 Hazardous material classification DOT designates the hazard class for anhydrous ammonia as 2.2 for domestic shipments and lists ammonia as a hazardous substance with a reportable quantity (RQ) of 100 pounds (45 kg). The words “Inhalation Hazard” must be included on shipping papers and on containers and cylinders as required by special provision 13 noted in column 7 of the hazardous material table. Refer to 49 CFR 172.101 and 172.102 (c) [6]. The four-digit United Nations (UN) identification number for ammonia is 1005. In Canada, regulations are published in Transport Canada’s Transportation of Dangerous Goods Regulations and Regulations for the Transportation of Danger- ous Commodities by Rail [8, 9]. Under Canadian Transportation of Dangerous Goods Regulations ammonia is classified as a “Corrosive Gas 2.4 (9.2)” and may be transported to, through, and from the United States into Canada using this description with proper markings and placarding.
2 Definitions
2.1 Alteration It is a change in any item described in the original manufacturer’s data report that affects the pressure- containing capability of the container. Rerating a container by increasing maximum allowable working pressure or by increasing or decreasing allowable working temperature shall be considered an alteration.
2.2 Ammonia or anhydrous ammonia (These terms are used interchangeably in this standard.) The compound formed by the chemical combination of the elements nitrogen and hydrogen in the molar proportion of one part nitrogen to three parts hydrogen. This relationship is shown by the chemical formula, NH 3 . On a weight basis, the ratio is 14 parts nitrogen to three parts hydrogen or approximately 82% nitrogen to 18% hydrogen. Ammonia may exist in either gaseous, liquid, or solid state. It is not to be confused with aqua ammonia (ammonium hydroxide) which is a solution of ammonia in water.