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These industrial furnace parts can be formed alternately as tube type coolers formed of parallel pipes connected at its ends in headers, with the latter having internal baffles to define a serpentine path, or as box type coolers formed of steel plates or sheet and having internal baffle plates defining a serpentine path for the cooling fluid. In either case, fluid orificies are provided to permit a minor amount of flow through the baffles or baffle plates where there is a direction change in the serpentine flow path. This serves to prevent stagnation and prevent the problems of hot spots and steam bubbles where there is a change of direction in the cooling flow.
