 | 1908 - 500 pages
...given their proper values. Desfgnating the apparent factor of safety by F, we have then F = aX6XcXIJ. The first of these factors, a. is the ratio of the ultimate strength of the material to its elastic limit. By the elastic limit we. do not mean the yield point, but the true elastic limit... | |
 | Building - 1910 - 636 pages
...up to its elastic limit. 18. The factor of safety, or, as it is sometimes called, the safety factor, is the ratio of the ultimate strength of the material to the load that, under usual conditions, the material is called on to carry. Suppose that the load required... | |
 | 1914 - 536 pages
...muy be designated as factors a, b, c and d. Designating the factor of safety by V, F = nXbXcX<IThe first of these factors, a, is the ratio of the ultimate strength of the material to tbe elastic limit, meaning, in this case, by the elastic limit, that boundary line within whicb the... | |
 | Frank Eugene Kidder - Architecture - 1921 - 1950 pages
...without exceeding the working unit stresses. The Factor of Safety * of a piece of material under stress is the ratio of the ultimate strength of the material to the actual unit stress on the sectionarea; or it is the number by which the ultimate unit stress must be... | |
 | Erik Oberg - Machine design - 1923 - 312 pages
...may be designated as factors a, b, c and d. Designating the factor of safety by F, F = a X b X c X d The first of these factors, a, is the ratio of the...permanent set. For ordinary materials, the factor a Is 2; for nickel steel and oil tempered forglnpB. It Is reduced to 1 '«. The second factor b depends... | |
 | Walter Enoch Wines - Strength of materials - 1923 - 272 pages
...which may be designated as factors a, b, c, and d. Designating the factor of safety by F, F = aXbXcXd. The first of these factors a is the ratio of the ultimate strength of the material to the elastic limit, t meaning, in this case, by the elastic limit, that boundary line within which the material is perfectly... | |
 | Administrative law - 1939 - 1192 pages
...tubes or flues through which such products pass from the furnace to the uptake. (h) Factor of safety is the ratio of the ultimate strength of the material to the working stress. (i) Repair is the restoration of any damaged or impaired part to an effective and safe... | |
 | Administrative law - 1963 - 1032 pages
...vertical shell from which project a number of dead end tubes. (i) Factor of safety. Factor of safety is the ratio of the ultimate strength of the material to the stress maximum allowable. (J) Pressure of psi Pressure of psi is the gage pressure or the pressure... | |
 | Administrative law - 1949 - 708 pages
...through which such products pass from the furnace to the uptake. (h) Factor of safety. Factor of safety is the ratio of the ultimate strength of the material to the working stress. (i) Pressure or psi Pressure or psi is the gauge pressure or the pressure above atmospheric... | |
 | Administrative law - 1967 - 1212 pages
...through which such products pass from the furnace to the uptake. (g) Factor of safety. Factor of safety is the ratio of the ultimate strength of the material to the maximum allowable stress. (h) Pressure or psi Pressure or psi is the gauge pressure or the pressure... | |
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An externally fired fire-tube or flue boiler is a steam boiler, part of the outer shell of which is exposed to fire or to the products of combustion, and containing flues through which such products pass from the furnace to the uptake. 
