1 2 3 4


7


Cold Charge Tools Tools such as skimmers, ladles, etc., pose a special hazard because


they may contain a thin layer of surface moisture or rust that could cause spitting and splashing when put into contact with the metal bath. Preheating materials and tools will minimize this occurrence.


5 6 8


MODERN CASTING / July 2010


Ferrous Alloys Ferro-alloy materials can absorb moisture from their sur-


roundings. Follow the manufacturer’s instructions for storing alloying materials.


9


Ingot Addition Splashing and spitting can occur when introducing ingots to the melt as condensation comes in contact with the molten metal. Ideally, clean, dry ingots should be placed only into an empty furnace or on top of solid foundry returns. Ingots added to molten metal should be preheated and introduced using a remote automatic charging system.


35


Charge Specifi cation Specify charge materials free of liquids and do not accept sealed containers.


Material Storage Reduce the possibility of a water/metal explosion


by storing scrap material under cover for at least one day, or until thoroughly dry. Inside storage is preferred.


Material Inspection Carefully inspect scrap piles, bales and containers for any residual moisture (e.g. hydraulic or cleaning fl uids, oils, etc.).


Sealed Containers


Containers, including sections of crimped or closed tube or pipe, holding combustible liquids will explode long before the scrap melts. Pre-heating sealed materials will not prevent this hazard. In fact, the sealed container could ex- plode inside the preheating system. Operator vigilance and charge inspection are the only preventive measures. Sealed material must never be accepted as scrap material or permitted in the furnace or pre-heater.


Charge Dryers and Preheaters Dryers and pre-heaters maximize the removal of water and moisture


before the scrap or alloys enter the furnace bath. Preheating charge materials and tools can help to prevent splashing injuries.


Remote Automatic


Charging Systems Remote automatic charging systems permit the


operator to stand a safe distance from the furnace or behind protective barriers during charging.


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