BABCOCK & WILCOX SUPERHEATERS 



AS APPLIED TO BABCOCK & WILCOX BOILERS 



THE general features in the design of the Babcock & Wilcox superheater 

 as applied to all boilers of this company's manufacture have been briefly 

 described. There follows a detailed description of this superheater as 

 applied to individual boilers. 



BABCOCK & WILCOX BOILERS 



CONSTRUCTION The superheater as applied to the Babcock & Wilcox 

 boiler is formed of two transverse, square, wrought-steel boxes or manifolds 



into which 2 -inch, cold drawn, seamless 

 steel tubes, bent to a "U" shape, are 

 expanded. By variation in the length 

 and number of these tubes, the requisite 

 amount of superheating surface and cross 

 sectional area for the flow of steam is 

 provided. The tubes ordinarily are arranged 



FORGED-STEEL ELLIPTICAL , , , .. ., , 



SUPERHEATER HAND- m Sups of four and opposite the ends 



HOLE FITTINGS f each group an elliptical handhole is 



provided giving access for expanding 



or inspection! The handholes are machine faced and milled back from the inside 

 edge of the box a sufficient distance to make a seat. The openings are closed 

 on the inside by forged-steel handhole 

 plates shouldered to center in the opening, 

 the flanged seats being milled to a true 

 plane. These plates are held in position 

 by fixed studs and forged-steel binders and 

 nuts. The joints between superheater 

 boxes and plates are made with a thin 

 gasket. 



The superheater is located in the CROSS SECTION OFSUPERHEATER 

 triangular space below the boiler drums HEADER SHOWING HANDHOLE 

 and above the inclined tubes. Steam FITTINGS ASSEMBLED 



flows from the dry pipes located within the 



drums near their tops through 4-inch tubes which pass through internal and 

 external pads at the bottom of the drum shell, into a section of the inlet or 

 distributing superheater header or box, these tubes being expanded into the pads 

 and the box. The inlet superheater header is divided into as many sections 

 as there are drums to avoid strains due to expansion. 



From the outlet header, which is continuous, the superheated steam flows 

 through other 4-inch tubes to a cast-steel superheater center fitting supported 

 over the drums. The connections between these outlet tubes and center fitting- 

 s' 



