. Tentative revised boiler safety orders. — LO <=.--/.7S ..^.^ — -rr Doubly Radius Button Head Steeple Head Coun+ersunk Head Flat HcQd Dimensions may be larger or 1/10 smaller than those under heads may be used but are not required. Fig. 20 Acceptable Forms of Eivet Heads Riveting 253 Drilling of Holes. All rivet holes and staybolt holes andholes in braces and lugs shall be drilled full size or they may bepunched not to exceed 14 in. less than full diameter for materialover 5/16 in. in thickness, and i/g in. less than full diameter formaterial not exceeding 5/16 i
. Tentative revised boiler safety orders. — LO <=.--/.7S ..^.^ — -rr Doubly Radius Button Head Steeple Head Coun+ersunk Head Flat HcQd Dimensions may be larger or 1/10 smaller than those under heads may be used but are not required. Fig. 20 Acceptable Forms of Eivet Heads Riveting 253 Drilling of Holes. All rivet holes and staybolt holes andholes in braces and lugs shall be drilled full size or they may bepunched not to exceed 14 in. less than full diameter for materialover 5/16 in. in thickness, and i/g in. less than full diameter formaterial not exceeding 5/16 in. in thickness, and then drilled orreamed to full diameter. Plates, butt straps, braces, heads and lugsshall be firmly bolted in position by tack bolts for drilling orreaming all rivet holes in boiler plates except those used for thetack bolts. 254 After drilling or reaming rivet holes the plates and buttstraps shall be separated, the burrs and chips removed, the plates 72 REPORT OF BOILER CODE COMMITTEE, and butt straps
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsteambo, bookyear1919
