5


that are vaporized during use. Amines are not actually consumed in the core produc-


I


tion process but rather are captured in the facility’s scrub- ber system. Often, facilities use far more amine catalyst than is


needed for effi cient core production. Excessive amine vapors can lead to strong odors in the core room and visual distur- bances, such as rainbows or blue halos, around lighting. Operators sometimes solve minor core curing problems


by increasing gassing rates. Over time, these changes add up, and soon amine use is well above norms. Generally, amine use exceeding 1.8 lbs. triethylamine


(TEA) or 1.3 lbs. dimethylisopropylamine (DMIPA) per ton of sand can be reduced. T e following tips will help improve your facility’s amine system.


1


ELIMINATE System Leaks


Liquid leaks in the amine piping system are


severe fire, explosion and exposure hazards and should be shut down and repaired immediately. Most amine liquid piping systems operate under positive pressure, which increases the chance for leaks. The best approach is to use welded joint piping from end to end. The National Fire Pro- tection Association and U.S. Occupational Safety


36 | MODERN CASTING November 2011


Tips to Minimize Amine Use and Reduce Pollution


A properly designed and operated vaporizer system will minimize amine use, improve coremaking productivity and provide a safe workplace. JEFF KRAUSE AND WILL DAVIS, HA INTERNATIONAL LLC, WESTMONT, ILLINOIS, AND THE AFS 4N COMMITTEE, SCHAUMBURG, ILLINOIS


n any core room, a clean and safe work environment is a priority. One way to improve the work environ- ment in your core room is to optimize and trouble- shoot your facility’s amine vapor system.


Amines are liquid catalysts used to cure coldbox resins


and Health Administration require welded joints for inaccessible lines, such as those behind walls. Be sure to completely drain and purge amine piping before begin- ning any hot work. Amine vapor lines are even more prone to leaking than liquid lines. Vapor leaks are a frequent cause of eye injuries and a prime source of excessive amine consumption. Hose connections, gassing head seals and corebox parting seals are the most common points for leaks to occur. Shrouds and exhaust pickups sometimes can allow signifi cant leaks to go undetected. Leaks in these areas often can be identi- fi ed by squirting dish soap on connections, or inspecting


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