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

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IAFF Training for Hazardous Materials: Technician© Student Text Handling Damaged Cargo Tanks Mitigation Methods The following methods for handling damaged cargo tanks are prioritized from least to greatest risk. Again, do not attempt these procedures unless you have received special training. 1. Make any necessary repairs and allow the vehicle to proceed to its destination for product removal. Repairs you might be able to perform include replacing bolts, gaskets, or caps. You should not attempt repairs using plugs or patches that could be dislodged. 2. Move the cargo tank a short distance to an off-loading facility or other safe area for off-loading (only if the tank is not leaking). The hazardous materials team should follow the tanker to that location in case of a second spill. 3. Off-load the materials from the damaged cargo tank to another cargo tank. This method should be performed by cargo tank specialists only. 4. Drill the cargo tank for product removal (non-pressure aluminum cargo tanks only). This method should be performed by cargo tank specialists only. 5. On-site disposal by flaring (compressed gases in pressure cargo tanks). This method should be performed by cargo tank specialists only. Field Product Removal Methods Field product removal methods are those techniques used to remove the contents from a damaged or overloaded cargo tank. All of these product removal methods are considered outside the legitimate responsibility of the fire department. However, overseeing the planning and implementation of these methods is within the realm of fire department responsibilities. 9-38 Module 9: Control Techniques
Student Text IAFF Training for Hazardous Materials: Technician© These methods are discussed in this section to provide you with enough information to oversee these processes and recognize when inappropriate actions are taking place. Remember, protecting yourself and the community are your primary responsibilities. Field product removal methods include: • Transferring • Venting • Flaring • Venting and burning Transfers A transfer involves moving the contents of a damaged or overloaded cargo tank into a receiving tank (e.g., another cargo tank, intermodal tank, or portable tank). Often, cargo tanks involved in a rollover or other serious accident cannot withstand being uprighted if the tank is full—this is particularly true of aluminum non-pressure cargo tanks. The product must be transferred prior to uprighting and transporting the cargo tank if: • The cargo tank has been damaged to the extent that it cannot be safely uprighted or moved to an appropriate off-loading facility. • The tank itself is sound but, due to frame or understructure damage or other mechanical damage, it cannot be safely moved; or the damage to piping, valves, or fittings is such that it cannot be repaired. • Site conditions prevent uprighting the tank (e.g., terrain does not permit the use of air bags, cranes, or other equipment). Safety Precautions When Transferring The following safety precautions must be taken when performing a transfer: • Limit site access to required personnel only • Allow only qualified and experienced personnel to perform the work • Use appropriate personal protective equipment • Monitor site with appropriate vapor monitoring devices • Have foam, dry chemical extinguisher, and Module 9: Control Techniques 9-39
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