Steam power plants, their design and construction . gher tem-perature than 600 degrees Fahrenheit should be lined with fire-brick set in fire clay or lime mortar, preferably the former. Some-times the fire-brick lining extends from the bottom to one-thirdor one-half of the height. The core can be divided into sections,each about 40 to 50 feet high, and 4, 8^, 13, 173^ and 21 inchesin thickness from the top down. If the chimney is of fairly largediameter the 4-inch section should not be over 25 or 30 feet. Inthe largest chimneys 8 inches is the minimum thickness of thecore. It usually has a uni
Steam power plants, their design and construction . gher tem-perature than 600 degrees Fahrenheit should be lined with fire-brick set in fire clay or lime mortar, preferably the former. Some-times the fire-brick lining extends from the bottom to one-thirdor one-half of the height. The core can be divided into sections,each about 40 to 50 feet high, and 4, 8^, 13, 173^ and 21 inchesin thickness from the top down. If the chimney is of fairly largediameter the 4-inch section should not be over 25 or 30 feet. Inthe largest chimneys 8 inches is the minimum thickness of thecore. It usually has a uniform inside diameter so that changes inthickness are secured by offsets on the outside. With the batterfor the outer surface of the outside shell recommended in an ear-lier paragraph there is likely to be sufficient distance between theoffsets of the core and those of the outer shell to provide properclearance. When the chimney is drawn on paper this can be de-termined. Steel chimneys should also be lined to prevent loss of STEAM POWER PLANTS. 141. Boiltrs Figure 58.—Chimney,Laidlaw-Dunn-Gordon Co., Cincinnati^ O. 142 STEAM POWER PLANTS. heat and also air leakage, which will occur unless the joints arecarefully calked, a provision that is frequently overlooked. In constructing the opening for smoke flues at the base of thechimney care should be taken that it is not weakened at that top of the opening should be arched over or spanned withheavy steel beams built in the masonry. Should the chimney havean inner core the smoke flue should, of course, be continuousthrough both shells. Ladders for reaching the top of a chimneyare usually located on the inside of brick chimneys and more fre-quently on the outside of steel ones. If the latter, the continuoushand rails at the sides should be so designed as to allow for thepossibility of a difference in expansion between the ladder andthe chimney. The tops of brick chimneys should be covered witha cast-iron cap held in place b
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