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

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IAFF Training for Hazardous Materials: Technician© Student Text leaking drum. Raise the end of the leaking drum while your partner slides the overpack around the leaking drum. Then, push the leaking drum into the overpack and tilt both drums to an upright position. An alternative is a rolling slide-in or V-roll method in which you place the open end of the overpack drum under the rim of the leaking drum. Orient the drums so that they form a wide letter “V”. Push the drums from the apex of the “V” so that the rolling motion causes the leaking drum to roll into the overpack drum. Tilt both drums to an upright position. Whenever overpacking drums, consider the integrity of the leaking drum. In overpack operations, the container will experience a fair amount of stress. The weight of the drum should also be considered. A nearly full 35-gallon drum of sulfuric acid can weigh close to 600 pounds. Plugging / Patching Plugging and patching are other techniques for controlling the flow of product. Commercial Kits Commercial kits usually contain molly bolts, screws, rubber stoppers, wedges, clamps, patches, epoxy, and other assorted items. Kits are useful for small leaks on either small or large containers. However, to use these items you must usually come in contact with the product. Also, the area around the leak must be in good condition—intact, strong, and not corroded. Bandages Metal, rubber, or plastic bandages can be wrapped around containers to make a seal. However, they must often be inflated to press against container and seal tightly. In addition, the area the bandage is applied to must be relatively strong. Pneumatic Plugs Pneumatic plugs can be used for mitigating pipe leaks. They range from four inches to three feet in diameter, and must be inflated or expanded to work properly. 9-26 Module 9: Control Techniques
Student Text IAFF Training for Hazardous Materials: Technician© Sealants Most sealants are clay-like materials useful for filling punctures. They must be compatible with flammable liquids, and may be used in conjunction with other techniques. They are temporary at best, and may not have enough adhesion for high “head pressure”. Areas of Drum Leaks Before you attempt to plug or patch a drum, consider the effect of this action. Many drums will be empty or almost empty when you arrive. Drums can leak for a number of reasons and from a number of locations. If a drum is leaking from corrosion, a plug or patch application may cause further damage. It may be best to overpack without initial containment. Drums often leak from bungs, the small round holes in the top of the drum. If a drum is leaking from a bung, roll the drum so that the leak is above the product, then tighten the bung with the appropriate wrench. Many times, this will be all you need to do to control a leak. If a drum is leaking at the chime (the rim), upright the drum so most of the product is below the leak. If a drum is breached on the side, and overpacking is not possible, a plug or patch may be the best solution. Position the drum so that the breach is above the product. Sometimes a combination of plugging and patching will ensure a complete seal. Module 9: Control Techniques 9-27
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