Module 9: Control Techniques - International Association of Fire ...

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IAFF Training for Hazardous Materials: Technician© Student Text Small punctures, like nail punctures, are often hidden. Expose them by laying the drum on its side and observing for the location of the leak. Then orient the puncture above the product. Sealants or plugs usually work well with punctures. Cylinders Chlorine A and B kits are available for controlling chlorine and container leaks. These kits are used to control valve and plug leaks in 100-150 lb. chlorine cylinders (A kit) or ton containers (B kit). Kits may be used on similar sized cylinders, regardless of product. Chlorine leaks are controlled by placing caps over the leak area and forcing them into place with leverage from parts attached to the tank. You must be trained to apply these kits. If your department has them, make sure you receive regular training in their use. Plugging/Patching Pressure Vessels Containing leaks from pressurized vessels such as cylinders can be risky, depending on the product, the amount of pressure of the container, and the possibility of vapor clouds obscuring your vision. These situations are difficult because of the specialized tools required to control pressure leaks. Most of these devices are designed for specific containers and consist of a screw-on apparatus that allows the pressure to escape until a control valve is closed. If you have access to these tools, you should practice using them on non-leaking vessels. First, practice without protective clothing until the parts and procedures are familiar. Then practice wearing gloves and SCBA. Finally, practice in full drills with chemical protective clothing. Cylinders filled with compressed air can provide more realistic training. Leaks from pressure relief valves are not breaches. Pressure relief devices are designed to safely release container pressure and to protect container integrity. Sealing them in any way may increase stress on the container system. 9-28 Module 9: Control Techniques
Student Text IAFF Training for Hazardous Materials: Technician© Control Techniques for Cargo Tanks Over the road cargo tanks are found in almost every jurisdiction in North America. Carriers include non-pressure and low-pressure tanks, high-pressure cargo tanks, corrosive liquid carriers, and cryogenic liquid carriers. Types of Leaks Piping/Valve Leaks Leaks from valves and intake and discharge piping are relatively common on cargo tanks. They can be caused by lack of proper maintenance or by direct impact damage. You must fully understand the purpose and uses of various valves and pipes you may encounter. If at all possible, contact persons familiar with the tanker such as the driver, shipper, or carrier company. They can help you properly stop a piping or valve leak. Piping leaks can be stopped by either closing valves or tightening packing. If piping is leaking, it is better to close a valve before the leak than to seal the leak. This containment method limits product contact and risk. The type of tanker and its product will have a substantial effect on operations. MC 306/DOT 406 and MC 307/DOT 407 cargo tanks use gravity for off-loading, minimizing piping pressure. Module 9: Control Techniques 9-29
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Module 9: Control Techniques - International Association of Fire ...

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