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18 PAMPHLET 1 Once connections have been made, pressurize the system with a small amount of chlorine, and check for leaks. If a leak is found, it must be remedied before proceeding (see CI Pamphlet 155 (11.1)). 3.8.7 Closing Valves Apply 25-30 foot-pounds to the valve stem. Check for leaks. If any leaks still exist, the torque may be increased up to 40 foot-pounds. If the leak has not stopped at 40 foot- pounds, increase the torque on the valve stem to 50 foot-pounds. Foreign objects such as rust flakes or other debris can prevent positive shutoff of chlorine valves. If the container remains connected to the process and it is safe to do so, a complete cycling of the valve may dislodge the foreign material and allow positive valve shutoff. Always verify the valve is being turned clockwise for closing. If this fails to work, contact your supplier. 3.8.8 Disconnecting Containers As soon as a container is empty, the valve should be closed (see Section 3.7.7). Prior to disconnecting, reconfirm that the valve is closed and provide a means of removing the chlorine trapped in the flexible connecting line. This can be accomplished by either purging the line with dry air or nitrogen with a dew point of -40°F (-40°C) or lower or by applying a vacuum. Personal Protective Equipment should be used as appropriate for the task. See CI Pamphlet 65 (11.1). The container should be cautiously disconnected in case residual chlorine remains in the lines. The outlet cap should be applied promptly and the valve protective housing should be replaced. The open end of the disconnected flexible line should be capped promptly to keep atmospheric moisture from entering the system. 4. BULK SHIPPING CONTAINER 4.1 GENERAL Bulk chlorine is shipped by pipeline, tank cars, tank motor vehicles, portable tanks, and barge tanks. 4.2 TANK CARS 4.2.1 General The following is generalized information on chlorine tank cars. See CI Pamphlet 66 (11.1). 4.2.2 Specifications The most commonly used tank cars have a chlorine capacity of 90 tons. By regulation, tank cars may not be loaded with chlorine in excess of the nominal weight. Table 4.1 Key Government Specifications United States 49 CFR 179.102-2 49 CFR 176-314 (c) note 12 Transport Canada 79.102-2 73.314 (c) note 12PDF Image | Chlorine Basics 8
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