Feedwater Heating and Economizer In order to maximize the water temperature entering the boiler, the 5AT will be fitted with twin feedwater heaters mounted above the boiler. Heat to these will be provided from a small proportion (approx 16%) of the exhaust steam from the cylinders. Wardale has designed the water heaters to raise the […]
Economizer and Feedwater Heating Feedwater Heating The temperature of feedwater entering the boiler should be as high as possible in order to maximize steam production and to minimize thermal stresses in the boiler structure Feedwater heating can be achieved in many ways. The “steam injectors” commonly used on First Generation locomotives provides a degree of […]
Piston vs. Caprotti Valves – The Final Discussion? Part 7 See previous page for Wardale’s responses to John Duncan’s Comment 25. Note: The full text of this correspondence can be downloaded in PDF format under the title: Wardale responses to Caprotti proposals 3 Sept 2009. John Duncan’s Comment 26: Quotation from Locomotive Post (date not legible) CAPROTTI […]
Piston vs. Caprotti Valves – The Final Discussion? Part 6 See previous page for Wardale’s responses to John Duncan’s Comments 21 to 24. See next page for Wardale’s responses to John Duncan’s Comments 26 to 28. Note: The full text of this correspondence can be downloaded in PDF format under the title: Wardale responses to Caprotti proposals […]
Piston vs. Caprotti Valves – The Final Discussion? Part 5 See previous page for Wardale’s responses to John Duncan’s Comments 17 to 20. See next page for Wardale’s responses to John Duncan’s Comment 25. Note: The full text of this correspondence can be downloaded in PDF format under the title: Wardale responses to Caprotti proposals 3 Sept […]
Piston vs. Caprotti Valves – The Final Discussion? Part 4 See previous page for Wardale’s responses to John Duncan’s Comments 11 to 16. See next page for Wardale’s responses to John Duncan’s Comments 21 to 24. Note: The full text of this correspondence can be downloaded in PDF format under the title: Wardale responses to Caprotti proposals 3 […]
Piston vs. Caprotti Valves – The Final Discussion? Part 3 See previous page for Wardale’s responses to John Duncan’s Comments 8 to 10. See next page for Wardale’s responses to John Duncan’s Comments 17 to 20 Note: The full text of this correspondence can be downloaded in PDF format under the title: Wardale responses to Caprotti proposals […]
Piston vs. Caprotti Valves – The Final Discussion? Part 2 See previous page for Wardale’s responses to John Duncan’s Comments 1 to 7. See next page for Wardale’s responses to John Duncan’s Comments 11 to 15 Note: The full text of this correspondence can be downloaded in PDF format under the title: Wardale responses to Caprotti […]
Piston vs. Caprotti Valves – The Final Discussion? Part 1 The following discussion is a response by David Wardale dated 3rd Sept 2009 to several observations and comments put to him by John Duncan in support of the adoption of British Caprotti valve and valve gear on the 5AT locomotive. Wardale’s responses are published on this […]
Enthalpy is a “term of convenience” that is useful in the interpretation and application of Thermodynamics. Enthalpy is basically a measure of energy, but its main function is in the calculation and measurement of “flow energy” or gaseous energy (e.g. steam energy). [Note (borrowed from mathpages.com): Enthalpy is not a specific form of energy. It […]
The Grate Limit as it relates to Boiler Efficiency On page 78 of his book The Red Devil and Other Tales from the Age of Steam, Dave Wardale defines the Grate Limit for a (normal) locomotive firebox as follows: The grate limit is the point “at which even by firing more coal and supplying more […]
Special Features of the 5AT Locomotive This “Features” page covers features of particular interest relating to the 5AT that differentiate it from First Generation Steam. These are covered under the following subheadings: Thermal Efficiency Power-to-Weight Ratio Adhesion Reliability Operating Costs Maintenance Costs Route Availability Fuels and Fuel Consumption Operating Range Emissions and Environmental Considerations Twin […]