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The Lancashire boiler is similar to the Cornish, but has two large flues containing the fires. It was the invention of William Fairbairn in 1844, from a theoretical consideration of the thermodynamics of more efficient boilers that led him to increase the furnace grate area relative to the volume of water.
In the flued boiler, any sediment fell past the furnace flue and settled out at the bottom of the boiler shell, where it had less effect. [5] In model engineering, the Cornish boiler, particularly when fitted with Galloway tubes (see Lancashire Boiler, below), is an excellent choice for gas-fired boilers and model steam boats. It is simple to ...
erosion of a boiler's plates from the internal water space, particularly where there is a step inside the shell. This was a problem for early boilers made from lapped plates rather than butted plates, and gave rise to many boiler explosions. In later years it was a problem for the non-circular water drums of Yarrow boilers. Handhole
The only railway use of water-tube boilers in any numbers was the Brotan boiler, invented by Johann Brotan in Austria in 1902, and found in rare examples throughout Europe, although Hungary was a keen user and had around 1,000 of them. Like the Baldwin, it combined a water-tube firebox with a fire-tube barrel.
During the test, the two 30 feet (9.1 m) by 8 feet (2.4 m) Lancashire boilers with 3 ft 2 in diameter flues produced steam at 156 psi. There were Galloway tubes in the flues and behind the boilers was an economiser with 288 pipes. Water was delivered to the boilers at 304 °F (151 °C).
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Steam for the pumping engines and auxiliary engines is raised in five Lancashire boilers, with the first set of boilers being made by Robert Stephenson and co. In normal operation only two out of the five boilers would be in steam with one on hot reserve and the other two having maintenance work. The boilers were on an 8 weekly rotation.
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