. Railway age gazette . he small capacity of this header superheater isbrought about by the fact that it does not extend into the largeflues in the boiler. With these large flues open or unobstructedby the superheater elements, the boiler does not steam prop-erly, the draft action is unchecked, and holes are made in thefire by the violent agitation of the draft. With the standardsteam boiler, having all of the tubes of a small size or with thesuperheater boiler having the superheater elements in the largeflues, the draft pulsations are smoothed out and the fire is notso violently agitated. The
. Railway age gazette . he small capacity of this header superheater isbrought about by the fact that it does not extend into the largeflues in the boiler. With these large flues open or unobstructedby the superheater elements, the boiler does not steam prop-erly, the draft action is unchecked, and holes are made in thefire by the violent agitation of the draft. With the standardsteam boiler, having all of the tubes of a small size or with thesuperheater boiler having the superheater elements in the largeflues, the draft pulsations are smoothed out and the fire is notso violently agitated. The small superheater gives a maximumsuperheat of but 26 deg. The superheaters of one-quarter, one-half, and three-quarterlength show a regular increase in superheat produced, with the increase in length of superheater. The one-quarter length pro-duces a maximum superheat of 90 deg., and the three-quarterlength a maximum of 190 deg. It is also shown by Fig. 3 thatas the superheat is increased, the evaporation, when running. 80 120 lOo 200 DISIANCE FROM FIREBOX. INCHES Fig. 8—Temperatures in the Superheater Flue and Boiler Tube at a short cut-off, is decreased, and further, that the one-halflength superheater gives the greatest evaporation that was ob-tained with any of the superheaters, about 55,000 lb. per would seem to be a best superheater length or area for ^ 1 60 tRNe LCR FLU 1 1 .Tta r NO <s La tOi5 . or S OF »RaF / -^ ^ ^ V :0At. WATT 6A FlHtCK 0 D PE^ ■>- 800 -^ -- I i 600 ^ ■-- «- -o— ^ I t ISM nEB IX 200 rii t»OI ENI SMf <tBO ( Er D 240 280 o 40 80 120 160 200 DISTANCE FEOM FIREBOX. INCHES Fig. 9—Temperatures in the Superheater Flue and Boiler Tube maximum evaporation, but it must not be understood that thissuperheater, which is best for evaporation, gives the maximumhorse power. The extra length shows a higher superhe
Size: 1541px × 1621px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1913
