. Journal of electricity, power, and gas . to the runner is supplied. The pressure-pipe or penstock is brought directlyto the casing, without a gate valve. This arrangementis satisfactory, from the fact that the pipe-line is com-paratively short, each turbine has its own pipe-line and the motor-operated gate-valve at the head of thesteel pipe fulfills any function for which a gate-valveat the turbine might be used. It further reduces com-plication in the powerhouse equipment. The draft-tube is of cast-iron, in sections, bolted together. Provision has been made, at a point in the casing,corresp
. Journal of electricity, power, and gas . to the runner is supplied. The pressure-pipe or penstock is brought directlyto the casing, without a gate valve. This arrangementis satisfactory, from the fact that the pipe-line is com-paratively short, each turbine has its own pipe-line and the motor-operated gate-valve at the head of thesteel pipe fulfills any function for which a gate-valveat the turbine might be used. It further reduces com-plication in the powerhouse equipment. The draft-tube is of cast-iron, in sections, bolted together. Provision has been made, at a point in the casing,corresponding with an opening in the front wall ofthe building, for attaching a relief-valve, should thisexpedient be found necessary. So far relief-valveshave not been installed. The casings were designed towithstand any extra pressure, due to surges, withoutthe use of this auxiliary equipment. Cast-steel guide vanes distribute the flow 10 therunner; these are mounted in the usual manner, onsteel spindles, which are brought up through stuffing. Cross Section through the Po-werhouse. boxes and terminate in a bell-crank. They are oper-ated through links, by a movable ring, which in turnis connected to and operated by the pistons of thegovernor cylinders. The vane-faces of the runners arecarefully finished to reduce losses by friction. Directlyabove the runner is a guide-bearing carried by thecover of the turbine. The total weight of the revolving parts, includingthe shaft and the rotor of the generator is 145,000 lbs.;that of the turbine proper is 25,500 lbs. This weightis carried by an oil-disc step-bearing. The latter ismade up of two discs; the lower one being stationaryand supported by the arch floor of the compartment,already described. The upper disc is a tight fit againsta shoulder, virtually a part of the shaft, and therebycarries the entire weight of the moving mass. Oil,under a pressure of 215 lb. per square inch is fedinto an annular compartment, between the lower discand th
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Keywords: ., bookcentury1800, bookdecade1890, bookidjo, booksubjectelectricity
