These curves were then superimposed on each other at this interval, which was 31.89 sec., until the number of ingots was increased to the maximum load on the mill. Adding the ordinates under this condition Fig. 34 was produced, showing the integrated load carried by the motors. The shaded portion indicates motor and line losses and the upper line of the curve hows the character of the load on the power station. This cycle, which is 31.89 sec. indicates an exceedingly variable load, the total variations being from a minimum of 4300 h.p. to a maximum of 19,010 h.p. with an average of 12,025 h.p., which makes the load-factor on the six-train motors almost exactly 50 per cent. The curve was developed to provide a basis for estimating the size of the storage-battery necessary to take care of the fluctuations and keep a constant load on the gene ating station. Conclusions. One of the most satisfactory conclusions, so far as the Indiana Steel Co. is concerned, that can be drawn at the present date is that so far all the apparatus described in this paper, which has been tried out, has been practically a As perfect success. Nothing has occurred to indicate that there is any necessity of changing anything to a radical extent. an example of this, the ore-handling machinery was started on FIG 34.-Chart showing estimated combined load on the mill. To be read from left to right. July 23, 1908, and by Nov. 1, three-quarters of a million tons of ore were stored in the yard, with virtually no more trouble from the machinery than would have been experienced at a works which had been in operation for several years. |