. The street railway review . FOSTER ABOVE WATER TUBES. ner. This prevents fluctuation in the degree of superheat, due tocorresponding fluctuations in the gases from the furnace. The full sectional area of an element in this design of superheateris not open to the steam, but has supported concentrically with theouter shell a tube with such a diameter that an annular space ofabout one-quarter of an inch is left for containing the steam. Thisconstruction compels the steam to stay close to the interior heatingsurface, which results in a high degree of efficiency in heat tra
. The street railway review . FOSTER ABOVE WATER TUBES. ner. This prevents fluctuation in the degree of superheat, due tocorresponding fluctuations in the gases from the furnace. The full sectional area of an element in this design of superheateris not open to the steam, but has supported concentrically with theouter shell a tube with such a diameter that an annular space ofabout one-quarter of an inch is left for containing the steam. Thisconstruction compels the steam to stay close to the interior heatingsurface, which results in a high degree of efficiency in heat trans-mission. The small amount of steam contained in such a super-. DETAIL OF RETURN HEADER. heater adds to the element of safety and confines the eflfect of over-heating during a pause in the flow to such a small amount as willreadily be absorbed by the cold pipes and connections beyond, when-ever the flow is resumed. Such a detail of operation is particularly desirable when the gen-erators are operating with a fluctuating load, because when theload suddenly falls oflf and the engine takes less steam from theboiler, the flow through the superheater is retarded, thus allowmg Dkc. is, igos.] STREET REVIEW 895 tiic slcaiii ill tlie (■IciiK-nls to receive somewhat more than the aver-age heat. During this time of liKht load the steam pipes and con-nections, whicli have ))een kept at the high lenipcralurc hy thepassage of superheated steam, tend to ccjoI down. Wiicn the heavyload is again taken on and steam is drawn from the hoiler, thissteam wliich has more than the usual degree of superheat willI)ass iiUn the pipes, hut the amount of steam is
Size: 1641px × 1522px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
