. Tentative revised boiler safety orders. quired cross-sectional area of the brace. 224 Gusset stays when constructed of triangular right-angledweb plates secured to single or double angle bars along the two NEW INSTALLATIONS, PART I, SECTION I, POWER BOILERS 61 sides at right angles shall have a cross-sectional area (in a plane atright angles to the longest side and passing through the intersectionof the two shorter sides) not less than 10 per cent greater thanwould be required for a diagonal stay to support the same surface,figured by the formula in Par. 221, assuming the diagonal stay isat
. Tentative revised boiler safety orders. quired cross-sectional area of the brace. 224 Gusset stays when constructed of triangular right-angledweb plates secured to single or double angle bars along the two NEW INSTALLATIONS, PART I, SECTION I, POWER BOILERS 61 sides at right angles shall have a cross-sectional area (in a plane atright angles to the longest side and passing through the intersectionof the two shorter sides) not less than 10 per cent greater thanwould be required for a diagonal stay to support the same surface,figured by the formula in Par. 221, assuming the diagonal stay isat the same angle as the longest side of the gusset plate. 225 Staying of Upper Segments of Tiibe Heads hy Steel the shell of a boiler does not exceed 36 in. in diameter and isdesigned for a maximum allowable working pressure not exceeding100 lb. per sq. in., the segment of heads above the tubes may bestayed by steel angles as specified in Table 6 and Fig. 18, exceptthat angles of equal thickness and greater depth of outstanding. Fig. 17 Measurements tor Determining Stresses inDiagonal Stays leg, or of greater thickness and the same or greater depth of out-standing leg, may be substituted for those specified. The legs at-tached to the heads may vary in depth }^ in. above or below thedimensions specified in Table 6. 226 When this form of bracing is to be placed on a boiler, thediameter of which is intermediate to or below the diameters givenin Table 6, the tabular values for the next higher diameter shallgovern. Rivets of the same diameter as used in the longitudinalseams of the boiler shall be used to attach the angles to the headand to connect the outstanding legs. 227 The rivets attaching angles to heads shall be spaced notover 4 in. apart. The centers of the end rivets shall be not over 3in. from the ends of the angle. The rivets through the outstandinglegs shall be spaced not over 8 in. apart; the centers of the endrivets shall be not more than 4 in. from the ends
Size: 2543px × 983px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectsteambo, bookyear1919
