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CHLORINE BASICS 19 The regulations require tank cars to be equipped with a pressure relief device whose setting is stenciled on the side of the car. Tank cars must be thermally protected with four inches of insulating material. 4.2.3 Manway Arrangement The only opening into a chlorine tank car is through a manway on top, where the valves are enclosed with a steel cover. Most chlorine tank cars have four angle valves. They also have one pressure relief device designed to release excess pressure buildup within the tank. Two of the angle valves are located on the longitudinal center of the car. These valves are connected to eduction pipes that run to the bottom of the tank and are used to unload liquid chlorine. Two angle valves are located on a line perpendicular to the car's length and are connected to the vapor phase. These valves should never be used for gas withdrawal, but can be used to pressurize the car when needed to increase the rate of liquid withdrawal. In cars built prior to 2009, the liquid valves are equipped with excess flow valves designed to close at flow rates of 7,000, 15,000 or 32,000 lb per hour. The flow rate is usually stenciled on the side of the car. Unstenciled cars have 7,000-lb-per-hour valves. Starting in 2009, chlorine tank cars began to be equipped with an alternate valve design. The primary feature that is different on the alternate design is that a check valve is used in place of an excess flow valve. The check valve is designed to remain closed during transport, so in the unlikely event of a rollover where valves shear off, the valve port remains closed and prevents an accidental release. Arrangements consisting of the alternate design may have wider bases and can consist of either 3 or 4 liquid/vapor valves and one pressure relief device. The CI Emergency Kit C is designed to be used for stopping leaks on chlorine tank cars. See CI Pamphlet 66 (11.1). It is important to know if an alternate valve design or the traditional valve design is used on a tank car because the C-Kit will need to be applied differently, depending on the valve design encountered. For additional guidelines, recommended practices, and other useful information concerning chlorine tank cars, refer to CI Pamphlets 66, 166 and 168 (11.1). 4.2.4 Transfer Operations The following is general information. See CI Pamphlet 66 (11.1). Precautions Every site handling chlorine in bulk containers should have RMP and PSM programs. Special attention should be directed to the appropriateness of emergency procedures and to equipment to be used in an emergency. Chlorine transfer operations must be performed only by personnel who are trained as required by applicable hazardous material regulations.PDF Image | Chlorine Basics 8
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