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

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IAFF Training for Hazardous Materials: Technician© Student Text Purchasing Containment Equipment There is a variety of containment equipment available commercially, ranging from relatively inexpensive rubber stoppers and wooden wedges, to expensive pneumatic plugs and bandages and specialized kits for cylinders. Your primary concern, after your safety, is whether the plug, patch or other containment item will resist the leaking product. It is of little value to contain a leak, only to have the containment device dissolve. Based on your hazard analysis, you may need specialized containment devices and materials. Check with local industry. They deal with leaks of their products on a more frequent basis than you, and have probably developed or purchased confinement and containment devices that work effectively. You can also fabricate your own devices based on the common hazards in your area. When making or buying containment equipment, always consider the equipment’s chemical resistance and ease of use while wearing CPC. Develop a resource list of equipment available from industries in your jurisdiction. You will need access to this equipment to train and maintain proficiency in its use. Auxiliary Tools/Equipment There are many items used in containment activities that do not actually contain the product. • Bung wrenches are specially designed tools used to tighten the bungs and vents on drums. They are usually non-sparking. • Non-sparking tools such as wrenches, hammers and clamps are used to prevent sparking in a flammable atmosphere. • Drum levers help you upright drums by providing leverage. • Drum dollies/carts are designed to help you move drums easily. They typically slide under a container and allow you to wheel it away. 9-22 Module 9: Control Techniques
Student Text IAFF Training for Hazardous Materials: Technician© Basic Control Techniques Assessing Damage Use the following checklist as a guide for assessing damage, whether a release is from a cargo tank or a tank car: Cracks: • Cracks are narrow splits or breaks in material caused by fatigue or impact. • Cracks may lead to catastrophic failure in pressurized containers. Scores: • Scores are reductions in thickness when the container is indented. Gouges: • Gouges are reductions in the thickness of a container when part of the container material is removed. Dents: • Dents are deformations in a tank caused by blunt objects. • Sharp radius dents may result in cracking. Burns: • Wheel burns result from constant contact with a turning wheel which reduces the thickness of the tank car. • Rail burns result from a moving tank passing over a stationary object. • Street burns are deformations in a tank shell caused by sliding on pavement. Points to Remember: • Damage may be to outer shell only and may be difficult to assess. • Pressure containers may fail catastrophically. • Valves may not operate properly when they are in a different orientation (sideways, upside down); this may be the cause of the leak. • If you are unsure of the container status: • Get expert help. • Take all defensive measures. Module 9: Control Techniques 9-23
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Module 9: Control Techniques - International Association of Fire ...

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