. Boiler safety orders. ndstays, the strength of the circumferential joints in the shell shall beat least 35 per cent that of the longitudinal joints. 185 When shell plates exceed 9/16 in. in thickness in horizontal NEW INSTALLATIONS, PART I, SECTION I, POWER BOILERS 45 return tubular boilers, the portion of the plates forming the laps of thecircumferential joints, where exposed to the fire or products of com-bustion, shall be planed or milled clown as shown in Fig. 8, to y2 thickness, provided the requirement in Par. 184 is complied with. Welded Joints. The ultimate tensile strengt
. Boiler safety orders. ndstays, the strength of the circumferential joints in the shell shall beat least 35 per cent that of the longitudinal joints. 185 When shell plates exceed 9/16 in. in thickness in horizontal NEW INSTALLATIONS, PART I, SECTION I, POWER BOILERS 45 return tubular boilers, the portion of the plates forming the laps of thecircumferential joints, where exposed to the fire or products of com-bustion, shall be planed or milled clown as shown in Fig. 8, to y2 thickness, provided the requirement in Par. 184 is complied with. Welded Joints. The ultimate tensile strength of a longi-tudinal joint which has been properly welded by the forging process,shall be taken as ,2i8,500 lb. per sq. in., with steel plates having a rangein tensile strength of 47,000 to 55,000 lb. per sq. in. 187 Longitudinal Joints. The longitudinal joints of a shell ordrum which exceeds 36 in. in diameter, shall be of butt and double-strap construction. 188 The longitudinal joints of a shell or drum which does not. Fig. Circumferential Joint for Thick Plates of Horizontal EeturnTubular Boilers exceed 36 in. in diameter, may be of lap-riveted construction; but themaximum allowable working pressure shall not exceed 100 lb. persq. in. 189 The longitudinal joints of horizontal return tubular boilersshall be located above the fire-line of the setting. 190 A horizontal return tubular boiler on which a longitudinallap joint is permitted shall not have a course over 12 ft. in butt and double-strap construction, longitudinal joints of anylength may be used provided the plates are tested transversely tothe direction of rolling, which tests shall show the standards pre-scribed under the Specifications of Boiler Plate Steel. 191 Butt straps and the ends of shell plates forming the longi-tudinal joints shall be rolled or formed by pressure, not blows, to theproper curvature. 16 report of boiler code committee, 192 Efficiency of Ligament. When a shell o
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