. Boiler safety orders. edor reamed to the full diameter. The holes shall be tapped fair andtrue, with a full thread. 211 The ends of steel stays upset for threading, shall be thor-oughly annealed. 212 An internal cylindrical furnace which requires staying shallbe stayed as a flat surface as indicated in Table 3. NEW INSTALLATIONS, PART I, SECTION I, POTHER BOILERS 53 213 Staying Segments of Heads. A segment of a head shallbe stayed by head to head, through, diagonal, crowfoot or gusset stays,except that a horizontal return tubular boiler may be stayed as pro-vided in Pars. 225 to 229. ,214 Ar
. Boiler safety orders. edor reamed to the full diameter. The holes shall be tapped fair andtrue, with a full thread. 211 The ends of steel stays upset for threading, shall be thor-oughly annealed. 212 An internal cylindrical furnace which requires staying shallbe stayed as a flat surface as indicated in Table 3. NEW INSTALLATIONS, PART I, SECTION I, POTHER BOILERS 53 213 Staying Segments of Heads. A segment of a head shallbe stayed by head to head, through, diagonal, crowfoot or gusset stays,except that a horizontal return tubular boiler may be stayed as pro-vided in Pars. 225 to 229. ,214 Areas of Segments of Heads to oe Stayed. The area of asegment of a head to be stayed shall be the area enclosed by lines drawn3 in. from the shell and 2 in. from the tubes, as shown in Figs. 13and 11. 215 In water tube boilers, the tubes of which are connected todrum heads, the area to be stayed shall be taken as the total area ofthe head less a 5 in. annular ring, measured from the inner circum-ference of the drum Fig. 14 Method of Determining Net Area of IrregularSegment of a Head When such drum heads are 30 in. or less in diameter and thetube plate is stiffened by flanged ribs or gussets, no stays need be usedif a hydrostatic test to destruction of a boiler or unit section built inaccordance with the construction, shows that the factor of safety is atleast 5. 216 In a Are tube boiler, stays shall be used in the tube sheets ifthe distances between the edges of the tube holes exceed the maximumpitch of staybolts given in Table 3. That part of the tube sheet whichcomes between the tubes and the shell, need not be stayed when thedistance from the inside of the shell to the outer surface of the tubesdoes not exceed that given by the formula in Par. 199, using 160 forthe value of C. 54 REPORT OF BOILER CODE COMMITTEE, 217 The net area to be stayed in a segment of a head may be de-termined by the following formula: 4 (H—5) = area to be stayed, sq. in. whe
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