. Tentative revised boiler safety orders. h, for the purpose of calculating its strength andspacing staybolts over its surface, shall be measured from the centerof rivets in the bottom of the water-leg to the center of rivets inthe flange of the lower tube sheet. 66 REPORT OF BOILER CODE COMMITTEE, 238 When the longitudinal joint of the furnace sheet of a verti-cal fire-tube boiler is of lap-riveted construction and staybolted, astaybolt in each circular row shall be located near the longitudinaljoint, as shown in Fig. 19. 239 Plain Circular Furnaces. Unstayed furnaces more than12
. Tentative revised boiler safety orders. h, for the purpose of calculating its strength andspacing staybolts over its surface, shall be measured from the centerof rivets in the bottom of the water-leg to the center of rivets inthe flange of the lower tube sheet. 66 REPORT OF BOILER CODE COMMITTEE, 238 When the longitudinal joint of the furnace sheet of a verti-cal fire-tube boiler is of lap-riveted construction and staybolted, astaybolt in each circular row shall be located near the longitudinaljoint, as shown in Fig. 19. 239 Plain Circular Furnaces. Unstayed furnaces more than12 in. diameter when riveted, of seamless construction, or when lapwelded by the forging process, shall have walls not less than 5/16in. thick. The maximum allowable working pressure for suchfurnaces, from 12 in. to 18 in. diameter inclusive, and of a lengthnot more than four and one-half diameters; also for furnaces morethan 18 in. diameter and not exceeding 38 in. diameter, shall bedetermined by one or the other of the following formulae:. Fig. 19 Proper Location of Staybolts Adjacent to Longitudinal Joint in Furnace Sheet a Where the* length does not exceed 120 times the thickness of the plate 51 5 C i P = -^-\ ()-()| h Where the length exceeds 120 times the thickness of theplate 4250 X^^ P = where LXD P = maximum allowable working pressure, lb. per sq. in. D = outside diameter of furnace, in. L = total length of furnace between centers of head rivet seams (not length of a section), = thickness of furnace walls, in sixteenths of an inch. In determining the maximum allowable working pressure forunstayed furnaces more than 18 in. diameter and not exceeding 38in. diameter, if over six diameters in length, L in the formula shallbe taken as six times the diameter. Example: Given a furnace 26 in. diameter, 94 in. long and NEW INSTALLATIONS, PART I, SECTION I, POWER BOILERS 67 % in, thick. The length exceeds 120 times the thickness of theplate, hence formula (&) shou
Size: 2738px × 913px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectsteambo, bookyear1919
