. Tentative revised boiler safety orders. head of the same diameter as the shell, is relieved by NEW INSTALLATIONS, PART I, SECTION I, POWER BOILERS 45 the effect of tubes or through stays, in consequence of the reductionof the area acted on by the pressure and the holding power of thetubes and stays, the strength of the circumferential joints in theshell shall be at least 35 per cent of that required for the longi-tudinal joints. c In the portion of circumferential joints of horizontal returntubular boilers, exposed to the products of combustion, the shearingstrength of the rivets shall be no
. Tentative revised boiler safety orders. head of the same diameter as the shell, is relieved by NEW INSTALLATIONS, PART I, SECTION I, POWER BOILERS 45 the effect of tubes or through stays, in consequence of the reductionof the area acted on by the pressure and the holding power of thetubes and stays, the strength of the circumferential joints in theshell shall be at least 35 per cent of that required for the longi-tudinal joints. c In the portion of circumferential joints of horizontal returntubular boilers, exposed to the products of combustion, the shearingstrength of the rivets shall be not less than 50 per cent of the fullstrength of the plate corresponding to the thickness at the joint. 185 When shell plates exceed 9/16 in. in thickness in horizontalreturn tubular boilers, the portion of the plates forming the laps ofthe circumferential joints, where exposed to the fire or products ofcombustion, shall be planed or milled down as shown in Fig. 8, to% in. in thickness, provided the requirement in Par. 184 is Fig. 8 Circumferektial Joint for Thick Plates of Horizontal Eeturn Tubular Boilers 186 Welded Joints. The ultimate strength of a joint whichhas been properly welded by the forging process, shall be taken as28,500 lb. per sq. in., with steel plates having a range in tensilestrength of 45,000 to 55,000 lb. per sq. in. Autogenous weldingmay be used in boilers in cases where the strain is carried by otherconstruction which conforms to the requirements of the Code andwhere the safety of the structure is not dependent upon the strengthof the weld. 187 Riveted Longitudinal Joints. The riveted longitudinaljoints of a shell or drum which exceeds 36 in. in diameter, shallbe of butt and double-strap construction. This rule does not applyto the portion of a boiler shell which is staybolted to the fireboxsheet. 188 The longitudinal joints of a shell or drum which does notexceed 36 in. in diameter, may be of lap-riveted construction; but 46 REPORT OP BOILER
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsteambo, bookyear1919
