IN the Firestone plants, the application of water for cooling purpose has progressed from year to year along the following lines. The original installation of mill rolls included a stuffing box in one end of the roll, with two 1 1/2″ holes in the end of this stationary box, one being the water inlet with a 1″ perforated standard pipe extending across the entire length of the inside of the roll. The coding water filled the entire cavity of the roll, placing it under line pressure with a drain through a 1″ pipe to the other connection in the stationary stuffing. box. This water is returned to a common header system and finds its way into the storm sewer system. This method of mill roll cooling required approximately 40 gallons of water per mill per minute, the water entering the roll at a temperature of 56° and leaving at approximately 60°, or a temperature rise of only 4° F. With this method, the difference between the temperature of the outgoing water and the stock was 85°. This method was exceedingly inefficient and used a large quantity of this scarce well water. Several years later it became necessary that more efficient means be found for cooling mill rolls. At that time the engineers designed an aluminum fin vane that extended the entire length of the inside roll cavity with a tip that forced the water directly against the inside surface of the steel roll. This aluminum vane also acted as a paddle which kept the water agitated as the roll revolved, and coming more rapidly in contact with the roll surfaces.

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