. Tentative revised boiler safety orders. maximum allowable working pressure, this to be indicatedin Arabic numerals, followed by the letters ^^Lb. All hot-water boilers or heaters are to bear a manufacturerslabel, that is irremovably attached to the front section, stating themaximum allowable working pressure for which the boiler is allowedto be used on *open systems and on closed systems. All heating boilers built according to these rules should bemarked standard. BOILER CODE APPENDIX Efficiency of Joints 410 Efficiency of Riveted Joints. The ratio which the strength of a u
. Tentative revised boiler safety orders. maximum allowable working pressure, this to be indicatedin Arabic numerals, followed by the letters ^^Lb. All hot-water boilers or heaters are to bear a manufacturerslabel, that is irremovably attached to the front section, stating themaximum allowable working pressure for which the boiler is allowedto be used on *open systems and on closed systems. All heating boilers built according to these rules should bemarked standard. BOILER CODE APPENDIX Efficiency of Joints 410 Efficiency of Riveted Joints. The ratio which the strength of a unit length of a riveted joint has to the same unit length of the solid plate is known as the efficiency of the joint and shall be calculated by the general method illustrated in the following examples: TS = tensile strength stamped on plate, lb. per sq. in. t = thickness of plate, in.• 5 := thickness of butt strap, = pitch of rivets, in., on row having greatest pitchd = diameter of rivet after driving, in. = diameter of rivet:hole. Fig. 25 Example of Lap Joint, LongitudinalOR Circumferential, Single-Riveted a = cross-sectional area of rivet after driving, sq. in. s = shearing strength of rivet in single shear, lb. per sq. in., as given in Par. 16S = shearing strength of rivet in double shear, lb. per sq. in., as given in Par. 16c = crushing strength of mild steel, lb. per sq. in., as given in Par. 15n = number of rivets in single shear in a unit length of jointN = number of rivets in double shear in a unit length of joint 97 98 REPORT OF BOILER CODE COMMITTEE, 411 Example: Lap joint, longitudinal or circumferential, single-riveted. A = strength of solid plate = PXtXTS B = strength of plate beween rivet holes = (P—d)t X TS C=shearing strength of one rivet in single shear=nXsX<x D = crushing strength of plate in front of one livet=dXtXc Divide B, C OT D (whichever is the least) by A, and the quotient will be the efficiency of a single-riveted lap joint as
Size: 1719px × 1454px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectsteambo, bookyear1919
