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

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IAFF Training for Hazardous Materials: Technician© Student Text Corrective Action for Cargo Tank Fittings Location of Leak Probable Cause Basic Repair Methods MANHOLE COVER Liquid or vapor leak around manhole cover FILL HOLE COVER Liquid or vapor leak around fill hole cover TOP MOUNTED SHUTOFF VALVE Liquid or vapor valve leaking Liquid or vapor valve leaking at tank outlet BOTTOM OUTLET VALVES (internal or external) Liquid leak at flange between tank and valve Liquid leak at end of offloading pipe (s) Loose clamp ring Defective gasket Not securely closed Defective gasket Valve not completely closed Valve not seated Defective seat or threads on valve Loose flange bolts/nuts Defective gasket Internal valve not properly seated Broken internal valve Tighten bolt To be handled by a cargo tank specialist Check for zero pressure, then open and re-close (do not if the tank is on its side); or Tighten wing nuts or apply cover clamp To be handled by cargo tank specialist Close valve Tighten valve To be handled by cargo tank specialist Tighten valve bolts/nuts To be handled by cargo tank specialist Open and re-close valve To be handled by cargo tank specialist 9-36 Module 9: Control Techniques
Student Text IAFF Training for Hazardous Materials: Technician© Corrective Action for Cargo Tank Fittings Location of Leak Probable Cause Basic Repair Methods VAPOR RECOVERY VENTS Liquid leak from vapor recover line Top vent not closed Tank overloaded Open and re-close top vent Off-load product* SAFETY RELIEF DEVICES Liquid or vapor leak from safety vent Ruptured frangible disk (liquid indicated possible overload) Melted fusible plug (liquid indicates possible overload) Replace frangible disk; off-load product if necessary* Replace fusible plug; off-load product if necessary* Liquid or vapor leak from safety relief valve -- nonpressure tanks Defective valve Tank overloaded Replace valve Off-load product* Liquid or vapor leak from safety relief valve -- low and high-pressure tanks Defective valve Tank overloaded To be handled by industry specialist To be handled by industry specialist *Many leaks can be repaired on loaded, but not overloaded, tanks; off-loading (or transferring) some or all of the product should be performed when the situation dictates. Module 9: Control Techniques 9-37
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