. Tentative revised boiler safety orders. ll patches that were applied prior to January 1, 1917, onthe boiler shell or drum which exceed twenty-four (24) inches inlength measured in a line parallel to the longitudinal seam andbetween the center lines of the extreme rivet holes, shall be calcu-lated for safe working pressure from said patch seam, the efficiencyof which shall be determined in accordance with paragraph 410 ofthe Appendix. (h) No double riveted horizontal patch seam shall be exposed tothe products of combustion and all single riveted horizontal patchseams over three (3) pitches in
. Tentative revised boiler safety orders. ll patches that were applied prior to January 1, 1917, onthe boiler shell or drum which exceed twenty-four (24) inches inlength measured in a line parallel to the longitudinal seam andbetween the center lines of the extreme rivet holes, shall be calcu-lated for safe working pressure from said patch seam, the efficiencyof which shall be determined in accordance with paragraph 410 ofthe Appendix. (h) No double riveted horizontal patch seam shall be exposed tothe products of combustion and all single riveted horizontal patchseams over three (3) pitches in length must be taken into accountin calculating the strength of the boiler. After October 1, 1920, where a diagonal patch seam is applied toa boiler, it shall be designed in accordance with diagram No. 1. flndicates revision, 1920, by the Industrial Accident Commission of the Stateof California. c5 .0 X ?~>. ^ § ^^ ^, ^i 0 CJ c:j ?-».. -K cv. cr t5 ^^ :3 ^ •^ l5 ^ k ^ 40 -^ ^ > o o r» :^ < ^ ^ ^ «^ o ^ <^ «5 o h-1. XIV TENTATIVE BOILER SAFETY ORDERS. Order 814. {a) No cast iron hot water heating boiler shall carry a greaterpressure, static or from supply main, than that named in theguarantee of the manufacturer. Order 815. {a) Where it is found impossible to definitely determine orreasonably estimate the age of a boiler, the factor of safety shallbe not less than five and one-half (5J). (5) No pressure on a boiler of lap seam construction shall exceedone hundred and sixty-five (165) pounds per square inch. Order 816. (a) The use of plug cocks so constructed that there is no glandor yoke to hold the plug in place will not be allowed. If yokes orglands are of the open hole slot type at both ends, they shall havesaid slots effectively closed. t(5) The use of clip-gate valves for steam pressures in excess oftwenty-five (25) pounds per square inch will not be allowed. Order 817. t {a) All hoods on vertical tubular boilers shall be provided with adoor approximatel
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsteambo, bookyear1919
