Document QVZ8565aa87j9vrq2KLDvYKE

Safety Engineering Tables all other parts, including structural steel, a factor not less than 5 On hot metal cranes, however, all these safety factors should be higher, even as high as 10 throughout For general hoisting purposes, it is not advisable for the working load of a wire to exceed % of its breaking strength This means a safety factor of 5, but factors in excess of this, and varying up to 8 or more, are often required for safe and economical operation Cast iron flywheels should have a safety factor of 10, but those made of wood should have the factor of safety raised to 20 Other data In addition to data on construction materials, information is supplied on lighting and ven tilation. chemicals and contaminants, mathe matical functions and conversion factors, and abbreviations used in this Manual TABLE 47-B BASIC STRESSES FOR LAMINATED STRUCTURAL MEMBERS Extreme jiber in bendtng or tension parallel to gram (psi) Maximum longi tudinal shear (pst) Compression perpen dicular to gram (pst) Compression parallel to grain (pst) Modulus of elasticity in bending (IJ000 psi) Baldcypress (southern cypress) Cedars Redcedar. western White-cedar Atlantic (southern white cedar) and northern White-cedar Port-Orford Yellow-cedar Alaska (Alaska-cedar) Douglas-fir. coast type Douglas-fir. coast type. close-grained Douglas-fir. Rocky Mountain type Douglas-fir, all regions, dense Fir, balsam Fir California red, grand, noble and white Hemlock, eastern Hemlock, western (west coast hemlock) Larch, western Pine eastern white (northern (white) ponderosa, sugar, and western white (Idaho white) Pine |ack Pine lodgepole Pine red (Norway pine) Pine, southern yellow Pine southern yellow, dense Redwood Redwood, close-grained Spruce, Engelmann Spruce, red, white, and Sitka Tamarack SOFTWOODS 2.400 1,600 170 135 1,400 2000 2,000 2,750 2,950 2,000 3,200 1,600 2.000 2,000 2,400 2 750 115 150 150 150 150 135 150 115 115 115 125 150 1,600 2,000 1.600 2,000 2,750 3200 2,200 2,400 1,400 2 000 2,200 135 135 100 135 180 180 115 115 115 135 160 330 220 195 275 275 350 375 310 410 165 330 330 330 350 275 240 240 240 350 410 275 295 195 275 330 2.000 1,300 1,050 1,650 1 450 2.000 2,150 1,450 2,350 1300 1,300 1,300 1,650 2.000 1 400 1,450 1 300 1,450 2,000 2350 1,850 2,000 1,100 1,450 1,850 1300 1,100 900 1,600 1300 1 800 1,800 1300 1300 1,100 1 200 1300 1300 1300 1 100 1300 1 too 1300 1 BOO 1,300 1,300 1300 1 100 1 300 1,400 1574