Steam power plants, their design and construction . ^^^^ f --m- •A /It-^ ,<^y7*i^,;« .^^^ O y-^ r-v V ^-^ vrf i «. /5. *-^^ti ^-//{?Z^. Tdi cweiaMuna *T°<^ < ELEWTION OF SEGMENT ON LINE X-X. Figure 60.—Steel Chimney at Wilmerding, Pa, BUILT BY THE RITER-CONLEY MANUFACTURING CO. 146 STEAM POWER PLANTS. equal to the maximum stress per lineal inch in the shell. Thetotal wind pressure is based on an assumed pressure of 25 poundsper square foot of projected area. A safe working stress is 10,000pounds per square inch and this should be reduced by the efficiencyof the riveted j
Steam power plants, their design and construction . ^^^^ f --m- •A /It-^ ,<^y7*i^,;« .^^^ O y-^ r-v V ^-^ vrf i «. /5. *-^^ti ^-//{?Z^. Tdi cweiaMuna *T°<^ < ELEWTION OF SEGMENT ON LINE X-X. Figure 60.—Steel Chimney at Wilmerding, Pa, BUILT BY THE RITER-CONLEY MANUFACTURING CO. 146 STEAM POWER PLANTS. equal to the maximum stress per lineal inch in the shell. Thetotal wind pressure is based on an assumed pressure of 25 poundsper square foot of projected area. A safe working stress is 10,000pounds per square inch and this should be reduced by the efficiencyof the riveted joint. If the efficiency of the riveted joint is 60 percent., then 6,000 pounds per lineal inch would be a safe workingstrength and the ratio of the stress per lineal inch, as found bythe equation, to 6,000 would be the thickness in inches of theshell required at the section under consideration. Calculation forthe thickness of the shell should be made at the base of the stack,the top of the bell and several points between it and the top. Thegreatest strain occurs at the top of the bell. On account of de-terioration that is apt to occur in the s
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