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CHLORINE BASICS 17 connected to a manifold. It is not sufficient to depend on ton containers reaching the same pressure merely by storing them in the same working area. Piping evacuation procedures should be established so liquid chlorine is not trapped in the system. 3.8.4 Weighing Because chlorine is shipped as a compressed liquefied gas, the pressure in a container depends on the temperature of the chlorine (Figure 10.1). The pressure is not related to the amount of chlorine in the container. Container contents can be determined accurately only by weighing. 3.8.5 Connections A chlorine compatible flexible connection must be used between the container and a pressurized piping system. Copper tubing with a diameter of 1/4-inch or 3/8-inch is recommended. Flexible metallic hoses or fluoroplastic hoses as described in CI Pamphlet 6 (11.1) are also acceptable materials. If a system is to remain in operation while containers are being connected or disconnected, auxiliary (isolating) container valves must be used. Flexible connections should be inspected and replaced on a regular basis. A flat gasket on the face of the valve is part of the connection. A new gasket should be used each time a connection is made (see CI Pamphlets 6 and 155 (11.1) and Drawing 189). 3.8.6 Opening Valves The container valve is opened by turning the valve stem in a counter-clockwise direction. One full turn of the stem typically permits an appropriate feed rate. More stem turns should not be made unless recommended by the supplier. A wrench (50 ft/lbs maximum torque), no longer than 8 inches, should be used. Never use a wrench extension (cheater bar) as the valve may be damaged preventing gas-tight shutoff. Once the valve is opened, the wrench should be left in place so that the valve can be closed quickly. Do not loosen the packing nut unless authorized by the supplier. To connect a line to the container, ensure the valve is closed. Make certain that the packing nut is at least hand tight; if it is not, contact your supplier for advice. Remove the valve outlet cap and attach the line to the valve with a yoke. Use a new gasket each time a connection is made. Make sure connections are tight. Figure 3.6 – Open Yoke Adapter – Type ConnectorPDF Image | Chlorine Basics 8
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