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A high-pressure steam locomotive is a steam locomotive with a boiler that operates at pressures well above what would be considered normal for other locomotives. Most locomotives operate with a steam pressure of 200 to 300 psi (1.38 to 2.07 MPa). [1] In the later years of steam, boiler pressures were typically 200 to 250 psi (1.38 to 1.72 MPa).
The speed of sound in steam is predictable if steam dryness is known. [45] Also, the specific volume of steam for a given temperature decreases with decreasing dryness. [46] [39] Two examples of estimates of speed of sound in steam calculated from whistles blown under field conditions are 1,326 and 1,352 feet per second. [47]
A steam locomotive operating at 350 psi (2,400 kPa) would have a temperature of about 220 °C (400 °F), and a specific enthalpy of 960 kJ/kg (440 kJ/lb). [6] Since standard pressure saturated water has a specific enthalpy of just 420 kJ/kg (190 kJ/lb), [ 7 ] the difference between the two specific enthalpies, 540 kJ/kg (240 kJ/lb), is the ...
The London and North Eastern Railway (LNER) Thompson Class A2/1 was a class of 4-6-2 steam locomotives built at Darlington locomotive works during 1944. They were originally ordered as Class V2 locomotives, as designed by Sir Nigel Gresley, but were revised during construction into a 4-6-2 'Pacific' arrangement under the instruction of Edward Thompson.
The boiler overpressure was set at the higher level of 20 atm (293.9 psi), whereas those of the standard locos were operated at 16 atm (235.1 psi). Both locomotives were fitted with a streamlined shell. The water tank tapered at the front and gave the engine driver and stoker a good all-round view of the line.
It was the formation of Peterborough Locomotive Society to look after 73050 that led directly to the establishment of the Nene Valley Railway some years later. 73050 was kept first in a siding at the old Peterborough East railway station. Richard Paten then borrowed a compressor, and the engine was driven along the siding, on a mere 40 psi of air.
They also sported the most heating surface of any two-cylinder steam locomotive, with a combined heating surface of 9,654 square feet (896.9 m 2). Despite their overall success, their long-wheelbase made it difficult to maintain a proper counterbalancing scheme as the drivers wore unevenly in service.
Two of the 0-6-0 locomotives built in 1906, nos. 898 and 900, were the first British locomotives to be provided with Schmidt superheaters when new, the purpose being to increase the temperature of steam produced in the boiler so the minimum of energy was lost. After months of trials, 20 further locomotives with the Schmidt superheater were ...