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42 PAMPHLET 1 Management of Change (MOC) process. See the OSHA Process Safety Management (PSM) regulations for MOC guidelines. Decontamination is especially important where cutting or welding operations are undertaken because iron and steel can ignite in chlorine near 300°F (149°C). Immediate drying of chlorine equipment, piping, or containers into which water has been introduced or which has been opened for repairs or cleaning is essential to prevent corrosion. Cleaning of piping and other equipment is addressed in CI Pamphlet 6 (11.1). 8.9.2 Entering Tanks Chlorine tank inspection, cleaning and repair are discussed in CI Pamphlet 5 (11.1). OSHA has specific regulations concerning the entering of confined spaces. These regulations should be thoroughly understood and followed. See OSHA standard 29 CFR 1910.146. 8.10 CHLORINE NEUTRALIZATION If a chlorine consuming process involves the discharge of a waste containing chlorine, special processes may be required. All governmental regulations regarding health and safety or the protection of natural resources must be followed. A system should be provided to neutralize any chlorine vented for maintenance preparation or process upset, such as a sudden failure of the chlorine compressor, trouble during the start-up of a circuit, or a breakdown of the tail gas handling system. The neutralization is usually accomplished by causing the chlorine to react with sodium hydroxide solution or, in certain situations, with another alkaline compound. Neutralization can take place in an appropriately designed tank or in a scrubber. The sodium hydroxide concentration should be less than 20% to prevent precipitation of sodium chloride crystals (salting-out) and excessive heat of reaction. See CI Pamphlet 89 (11.1). 9. U.S. REGULATIONS AND CODES Note: The purpose of this section is to provide a list of some of the regulations that significantly affect the production, storage, packaging, distribution, or use of chlorine in the United States. Additionally, information is provided on some of the Fire Codes that similarly affect chlorine. This section is not meant to cover all regulations affecting chlorine. 9.1 OCCUPATIONAL SAFETY AND HEALTH REGULATIONS -29 CFR PARTS 1904 AND 1910 9.2 NAVIGATION AND NAVIGABLE WATER REGULATIONS -33 CFR PARTS 1-26, 126, 127, 130, 153-156 AND 160-167 9.3 ENVIRONMENTAL REGULATIONS - 40 CFR: PROTECTION OF ENVIRONMENT; PARTS 61, 68, 82, 141, 152, 260-269, 302-355, 370-372, 415 AND 700-799PDF Image | Chlorine Basics 8
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