. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . FIG. 3. REAR SECTION AND STEAM PIPES. heating the steam to an average of 100degs. Superheating is thus accomplishedby waste heat in the ^ases of combustionwithout sacrificing any effective heatingsurface in the boiler. The construction of the superheater isshown clearly by Fig. I. The forwarddrum is circular in cross section and isplaced ahead of the exhaust pipe. Therear drum is somewhat oval in cross sec-tion in order to leave space above for thedry pipe and stands over 2 ft. ahead ofthe fr
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . FIG. 3. REAR SECTION AND STEAM PIPES. heating the steam to an average of 100degs. Superheating is thus accomplishedby waste heat in the ^ases of combustionwithout sacrificing any effective heatingsurface in the boiler. The construction of the superheater isshown clearly by Fig. I. The forwarddrum is circular in cross section and isplaced ahead of the exhaust pipe. Therear drum is somewhat oval in cross sec-tion in order to leave space above for thedry pipe and stands over 2 ft. ahead ofthe front flue sheet of the boiler. Thesteam is conducted from the dry pipe for-ward to the front drum of the super-heater where it is circulated around the shown by Fig. 2. It is carried back fromthe front section to the top of the backsection where it is again circulated aroundthe fire tubes and the superheating corn- perfect and permanent joints. Thetubes in the front section are expandedand beaded in the regular manner. Owingto the thinness of all superheating sur-. 1 FRONT AND BACK SECTIONS OF SUPERHE.\TER. pleted. From this section the steam iscarried into the steam chests throughsteam pipes as illustrated in Fig. 3. The front section has a large cjlindricalopening between the flue sheet as shownin Fig. 4. A smoke tube through thisopening connects with the petticoat pipeby an elbow. The connections are madewith tight joints so that the draft in-duced by the exhaust causes no directcurrent from the boiler tubes to the flue gases from the boiler are drawnforward by the exhaust through the tubesof both sections and back through thecylindrical opening in the front the petticoat pipe and out the stackas illustrated in Fig. 5. Thus the gasesare brought into contact with all thesuperheating surface and an equalizationof draft in the boiler is secured which isnot possible with the usual draft appli-ances. The use of netting and the dia-phragm is entirely
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