. Boiler safety orders. e stress per square inch net crosssectional area of stays and staybolts shall be as given in Table 4. The length of the stay between supports shall be measured fromthe inner faces of the stayed plates. The stresses are based on tensiononly. For computing stresses in diagonal stays, see Pars. 2,21 and 222. 221 Stresses in Diagonal and Gusset Stays. Multiply the areaof a direct stay required to support the surface by the slant or diagonal NEW INSTALLATIONS, PART I, SECTION I, POWER BOILERS 55 length of the stay; divide this product by the length of a line drawnat right an
. Boiler safety orders. e stress per square inch net crosssectional area of stays and staybolts shall be as given in Table 4. The length of the stay between supports shall be measured fromthe inner faces of the stayed plates. The stresses are based on tensiononly. For computing stresses in diagonal stays, see Pars. 2,21 and 222. 221 Stresses in Diagonal and Gusset Stays. Multiply the areaof a direct stay required to support the surface by the slant or diagonal NEW INSTALLATIONS, PART I, SECTION I, POWER BOILERS 55 length of the stay; divide this product by the length of a line drawnat right angles to surface supported to center of palm of diagonal quotient will be the required area of the diagonal stay. A = aXLI where A = sectional area of diagonal stay, sq. = sectional area of direct stay, sq. = length of diagonal stay, as indicated in Fig. 15, — length of line drawn at right angles to boiler head or surface supported to center of palm of diagonal stay, as indicated in Fig. 15, Fig. 15 Measurements for Determining Stresses inDiagonal Stats Given diameter of direct stay = 1 in., a = , LI = 48 in.; substituting and solving: GO in., A = 48 sectional area, sq. in. Diameter ?= in. == 1% in. 222 For staying segments of tube sheets such as in horizontalreturn tubular boilers, where L is not more than times I for anybrace, the stays may be calculated as direct stays, allowing 90 per centof the stress given in Table 4. 223 Diameter of Pins and Area of Rivets in Brace. The sec-tional area of pins to resist double shear and bending when secured incrowfoot, sling, and similar stays shall be at least equal to three- 56 REPORT OF BOILER CODE COMMITTEE, fourths of the required cross-sectional area of the brace. The com-bined cross section of the eye at the sides of the pin shall be at least25 per cent greater than the required cross-sectional area of the cross-sectional area of the rivets attachi
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