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CHLORINE BASICS 41 chlorine has been purged from the system. When leaks have been repaired, the line should be retested. 8.7 PIPING SYSTEMS FOR WET CHLORINE Wet chlorine is very corrosive to all of the more common construction metals. Materials must be selected with care At low pressures, wet chlorine can be handled in chemical stoneware, glass, or porcelain equipment and in certain alloys. Hard rubber, unplasticized polyvinyl chloride, fiberglass reinforced polyester, polyvinylidene chloride or fluoride and fully halogenated fluorocarbon resins have been used successfully. For higher pressures, lined metallic or compatible metallic systems should be used. Hastelloy® C, titanium, and tantalum have been used. Titanium may only be used with sufficiently wet chlorine but must not be used with dry chlorine under any circumstances, as it burns spontaneously on contact. Tantalum is inert to wet and dry chlorine at temperatures up to 300°F (149°C). 8.8 STATIONARY STORAGE Consumers receiving chlorine in barges, tank cars or trucks may require stationary storage facilities. The facilities should be properly designed and should be operated and periodically inspected in accordance with CI Pamphlet 5 (11.1). A tank should not be filled beyond its rated chlorine capacity because liquid chlorine will expand as it warms. At normal storage temperatures, the thermal expansion rate of liquid chlorine is high and, if room for expansion is not provided, could increase the hydrostatic pressure enough to rupture the tank. The maximum chlorine level should be determined by the filling density as discussed in Section 2.5.11. 8.9 EQUIPMENT MAINTENANCE 8.9.1 General All chlorine piping and equipment should be carefully inspected on a regular basis. Inspections can be done using ultrasonic thickness testing, eddy current testing, magnetic flux testing, and other non destructive testing. See CI Pamphlet 6 (11.1). Maintenance of chlorine equipment and tanks should be under the direction of trained personnel. All precautions pertaining to safety education, protective equipment, health, and fire hazards should be reviewed and understood. Workers should not attempt to repair chlorine piping or other equipment while it is in service. When a chlorine system is to be cleaned or repaired, tanks, piping and other equipment should always be purged with dry air or non-reactive gas. All significant piping or process changes must follow aPDF Image | Chlorine Basics 8
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