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38 PAMPHLET 1 It is important to ensure the heat exchanger is cleaned and ready for chlorine service. The reaction of residual organics/lubricants in the equipment with chlorine presents a potential fire hazard. See CI Pamphlet 6 (11.1) for details on “Preparation for Use”. 8.5.4 Pumps Pumps for chlor-alkali service are constructed of a wide range of materials. A supplier of such pumps should be contacted for design and use, such as certain plastic-lined or rubber-lined steel, reinforced polyester and titanium. Liquid chlorine pumps are special items with particular risks to be considered and managed. As with all rotating equipment in chlorine service an abrasion can result in a chlorine/metal fire and subsequent chlorine release. Appropriate interlocks/shutdowns should be put in place to minimize these risks. 8.5.5 Compressors and Blowers Compressors used in dry chlorine service include centrifugal, non-lubricated reciprocating, and liquid-ring sealed (sulfuric acid). Compressors and blowers should be built in accordance with the applicable ASME code and supplier specifications. Aluminum, copper and copper alloys must be avoided. As with all rotating equipment in chlorine service an abrasion can result in a chlorine/metal fire and subsequent chlorine release. Discharge temperatures should be designed and managed to assure that the limits of the equipment metallurgy are not exceeded. Fans are sometimes used to boost pressure or move chlorine gas in vent or scrubber systems. In wet chlorine service, rubber-lined, fiberglass reinforced polyester or titanium are normally used. In dry chlorine service, carbon steel is normally used. 8.5.6 Scrubbers While scrubbers are an effective means of absorbing chlorine, the need for a scrubber should be based on a site-specific hazard assessment that considers factors such as the quantity of chlorine on site, the likelihood of a release, and the consequences of a release. The design of the scrubber depends on the quantity of chlorine to be absorbed, the flow rate of air through the scrubber and the scrubbing liquid. See CI Pamphlet 89 (11.1). 8.6 PIPING SYSTEMS FOR DRY CHLORINE Piping as described in this section pertains only to above ground fixed piping. See CI Pamphlet 6 (11.1). 8.6.1 Materials In general, ASTM A106 Grade B Schedule 80 seamless carbon steel piping is recommended for handling dry chlorine when the process temperature range is from - 20°F to 300°F (-29°C to 149°C). Stainless steels of the 300 series have useful properties for low temperature service but can fail due to chloride stress corrosionPDF Image | Chlorine Basics 8
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