The objectives of this book are to give technical information about anodic pro­ tection, explain how economic analyses are made to determine whether or not it should be used, and describe some of the applications and equipment. Lim­ itations of the technique will be pointed out. Technological changes that have resulted in higher temperatures, pres­ sures, and velocities increase corrosion rates and markedly influence materials selection and design decisions. Continuous cycle systems impose increased demands on system reliability. New processes require more sophisticated equipment made of costlier metals which are often in short supply and subject to the vagaries of international commerce. The impact of continuing