TUBOTHAL ® ELEMENTS CASE STORY Grupo T.T.T., in the Bilbao area of Spain, is a group of companies specialized in heat treatment and surface treatment of metals. THE CHALLENGE One of their plants, Tratamientos Térmicos T.T.T., S. A., is equipped with 15 different furnaces, among them four sealed quench for carbonitriding, four continuous link-belt for smaller parts like nuts and bolts and a further seven furnaces for various processes. The company is mainly servicing the automotive and general engineering industry. The environmental program for the area promotes the use of electricity and since T.T.T. is also a net producer of electricity, all furnaces except four are electrically heated. SHORT LIFE ELEMENTS AND TUBES CAUSED PRODUCTION PROBLEMS The previous heating system used

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