Practical Instructions Relating to the Construction And Use of the Steam Engine Indicator
Practical Instructions Relating to the Construction And Use of the Steam Engine Indicator
Crosby Steam Gage And Valve Company
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FLOW OF STEAM THROUGH AN ORIFICE The velocity of steam at 100 to 150 pounds pressure, issuing from an orifice into the air, is from 1,300 to 1,500 feet per second. The weight of steam discharged through an orifice with rounded entrance, having 150 pounds abso- lute pressure on the entrance side, will be the same in amount for any back pressure from 90 pounds absolute down. At first sight this does not seem reasonable. The pressure drops at what is called the throat or the smallest section of th...e orifice or nozzle to 0.6 the absolute entrance pressure, provided the back pressure is not over 0.6 of the entrance pressure. Under these conditions, as the throat pressure and the velocity at the throat are the same, the quantity discharged will remain constant during changes in back pressure from 0.6 of the boiler pressure down to zero. The same is true also for gases. Digitized by VjOOQlC DESIGN OP A TURBINE NOZZLE 147 Measurement of Dry Steam by the Flow through an Orifice An empirical formula known as Napier's or as Rankine's gives very accurate results.
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