Crown sheet


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the flat plate which forms the top of the furnace or fire box of an internally fired steam boiler.

See also: Crown

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"We cut the steel and had the wrapper sheet rolled, and then the firebox flue sheets and crown sheet were cut out and holes drilled," Tom says.
Scaled to Perfection: FOUR YEARS IN THE MAKING, A SCALE MODEL STEAM ENGINE DEMONSTRATES THE POWER OF LOVE
The crown sheet, a flat sheet of 1/2 or 5/8-inch steel, is located on top of the firebox at the back of the boiler.
Like one of the family: three generations embrace steam traction tradition with 1913 Gaar-Scott engine
The standard locomotive-type boiler got a jacket fitted, a new front flue sheet, new crown sheet and was reflued.
Family heirloom: 1905 Kelly-Springfield road roller bonds generations
This engine had been operated in a low water situation, leaving the crown sheet (the upper boiler plate or sheet inside the firebox) over-heated and "bagged" (wrinkling the boiler plate), rendering it useless.
4 generations of engineers: farming with steam in Montana's Judith Basin
The report also boasted of the design of another product, the Stillwater engine: "The engine's return flue, being placed above the lines of the crown sheet, ensures a depth of several inches of water over it, so that it is never exposed in ascending or descending hills, and this, with the arch-like shape of the crown sheet, makes it so strong and safe that not a single instance of collapse or sagging of the crown-sheet has occurred in any one of the many hundreds of these boilers that have been and are now in use."
When giants roamed the earth: Minnesota Thresher Mfg. Co. an early innovator in steam traction engine design

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