gas from entering the scrubbers not in use and a small stream flows continuously to preserve these seals. All water flows to the settling basins and is therefore recorded in the weir readings. The fans, Fig. 5, are of Sturtevant type, electrically driven by direct-current and alternating-current motors, and each has a capacity of 84,000 cu. ft. of gas per minute. A water seal, Fig. 6, is placed on either side to provide means for repairing. The seal after the fan is also FIG. 6.-WATER SEAL BETWEEN COLLECTING GAS MAIN FROM SCRUBBER AND THE FOUR FANS. To GAS ENGINES A a spiral separator for water which may be picked up in the fan. calked main serves to connect the scrubbers with the fans and is 10 ft. FIG. 7.-SECTION THROUGH THEISENS, SEALS, AND SEPARATORS. 6 in. in diameter. After leaving the fans the gas is carried into an 8-ft. main, or primary gas main, and distributed. Theisens The Theisens, Fig. 7, are four in number, three driven by induced and one by direct-current motors. The motors are each 150 h.p. and drive the rotor 375 rev. per minute. Each Theisen has a capacity of 15,000 cu. ft. of gas per minute. There are seals and separators on the Theisens the same as on the fans. FIG. 8.-DIRTY-GAS MAIN WITH CLEAN-GAS MAIN AT HIGHER LEVEL, ALSO THE END OF THE REFINED-GAS The settling basins are 161 ft. in length, 26 ft. wide, and 11 ft. 6 in. total depth. The settling depth is 6 ft. There are two sections and these are used alternately. The sewer from the scrubbers into which the dirt and water is collected is so situated as to make possible the diversion of the water to either compartment. When the basins are filled with dirt the water is drained and the material loaded into cars by a grab Partitions are raised in the basins to aid in the retardation of bucket. the dirt. OPERATION OF PLANT The gas from six blast furnaces is allowed to go into a general dirty-gas main, 8 ft. 6 in. in diameter, shown in Fig. 8, and from here is distributed 100 to various destinations, as follows: No. 1, 2, 3, and 4 boiler houses, No. 1 and 2 sets of stoves, and gas-cleaning plant. A pressure of 12 in. of water is maintained in this main. The gas to the gas-cleaning plant goes through water valves to scrubbers, in parallel, going only through one and thence to the 10 ft. 6 in. collectng main, from which it goes through the fans to the primary or scrubbed-gas main and is distributed December |