The Locomotive . issue. The crank-pin shown on that page was referred to asbeing cast integral with the disc, whereas it was actually made of steel andpressed into the disc. As a consequence, the conclusion as to the strengthof cast pins, although proven true in many otlier instances, is not illustratedbv this one. 2o6 THE LOCOMOTIVE July, Low-Pressure Steam Overspeeded Turbine HAD not a quick-thinking engineer been in the immediate vicinityit is probable that the 1,500 Kw. mixed-pressure turbine picturedhere would have been totally wrecked when derangement of thelow-pressure control permitted
The Locomotive . issue. The crank-pin shown on that page was referred to asbeing cast integral with the disc, whereas it was actually made of steel andpressed into the disc. As a consequence, the conclusion as to the strengthof cast pins, although proven true in many otlier instances, is not illustratedbv this one. 2o6 THE LOCOMOTIVE July, Low-Pressure Steam Overspeeded Turbine HAD not a quick-thinking engineer been in the immediate vicinityit is probable that the 1,500 Kw. mixed-pressure turbine picturedhere would have been totally wrecked when derangement of thelow-pressure control permitted a full flow of low-pressure steam whilethe machine was running without load. The engineer quickly closedboth steam line stop valves and brought the turbine to a halt, but inspite of his promptness the buckets and blading of three discs and theircorresponding diaphragms were entirely ripped away. An investigationafter the accident revealed that a cast iron lever actuating the low-pressure inlet valve had The low-pressure stages of this turbine were designed to useexhaust steam at about 8 pounds pressure from a battery of hammersin the forge shop. To augment this, the turbine had also a high-pres-sure steam inlet and a selective governor arrangement so that high-pressure steam would automatically be admitted in case the supplyof low-pressure steam was insufficient to carry the electrical load. When the accident occurred the engineer heard something snapand noticed the turbine pick up speed. Thinking that perhaps the but-terfly valve in the high-pressure line had stuck open, he hastened toclose the stop valve in that line. As this did not seem to check thespeed he ran to the low-pressure stop valve and spun that closed. He ^929- THE LOCOMOTIVE 207 was just in time, for there is little doubt but that th6^turl)ine wouldhave run itself to destruction. As it turned out, the accident was serious enough. Repairs amountedto about $5,000 and, in spite of every means taken to exp
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Keywords: ., bookauthorhartfordsteamboilerin, bookcentury1800, bookdecade1860
