Steam power plants, their design and construction . s of thedifferent sections should be 8^^, 13, 173^, 22,26,^ etc., inches. Should the calculations forthe thickness of the wall at the bottom call fora thickness intermediate between two of thesethicknesses, the greaterone can be selected, asthe thickness of the bot-tom section. Shouldsuch calculation showthat the thickness at thebottom should be 22inches, the chimney canbe divided into four sec-tions of equal height,8^, 13, 173^ and 22inches thick. Radialbrick for chimneys aremade in several sizes sothat the thickness, whenthey are used, incr
Steam power plants, their design and construction . s of thedifferent sections should be 8^^, 13, 173^, 22,26,^ etc., inches. Should the calculations forthe thickness of the wall at the bottom call fora thickness intermediate between two of thesethicknesses, the greaterone can be selected, asthe thickness of the bot-tom section. Shouldsuch calculation showthat the thickness at thebottom should be 22inches, the chimney canbe divided into four sec-tions of equal height,8^, 13, 173^ and 22inches thick. Radialbrick for chimneys aremade in several sizes sothat the thickness, whenthey are used, increasesby about 2 inches at theoffsets. After the thickness ofwalls of the differentsections and theirheights are determined,the calculation for sta-bility must be made atthe base of each section,paying no attention tothat below. For in-stance in Figure 55, the ^ ,. ^ p. stability of the partSection C-D. , ^^^ , ,, , . THE ENG, REcoi- ABJI shouM bc calcU FiGURE 57.—CusTODis Radial Brick Chimney lated considering IJ a» FOR Orford Copper 140 STEAM POWER PLANTS. the base, also ABHG considering GH the base, etc., each timelocating the center of pressure for the part under consideration. Another operation yet remains, and that is to find the pressureimposed upon the brickwork by its own weight. Calculation mustbe made as to the pressure per square inch at the base, and ateach level where the shell changes in thickness, that is, at the bot-tom of each section. According to Prof. Lang, the pressure inpounds per square inch should nowhere exceed that given by theformula P == 71 + L where L denotes the distance in feetfrom the top of the chimney to the point in question. Should thepressure exceed that given by the formula the walls of the chim-ney should be made thicker. The function of the chimney heightis introduced in the formula to allow a greater pressure in highchimneys, which are erected less quickly than shorter ones, themortar therefore having more time to har
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