BABCOCK & WILCOX SUPERHEATERS 



SUPERHEATERS built by The Babcock & Wilcox Co. for installation 

 in all boilers of their manufacture are similar in design, location and 

 operation. As will be shown, there are conditions under which it is 

 advisable to change the design of the superheaters for different boilers in certain 

 details. The different styles of superheaters ordinarily supplied with different 

 boilers of The Babcock & Wilcox Company's manufacture will be described in 

 detail hereafter, the present description dealing only with the general features 

 common to all classes. 



The Babcock & Wilcox superheater consists ordinarily of two superheater 

 headers, or manifolds, into which cold drawn, seamless steel tubes bent to a " U ' 

 shape are expanded. 



Saturated steam is taken from the steam space of the boiler, introduced into 

 the intake header, passes through the tubes and is taken from the outlet header. 



The superheaters in all classes of boilers are so placed that the tubes are in 

 the direct path of the gases and the steam is superheated in its passage through the 

 tubes by the same gases which are utilized to generate the saturated steam. 



The location in all boilers is such that the superheaters are readily accessible 

 for inspection and repair. Handholes in the manifolds give easy access to the 

 interior of the headers and these handholes are so located that all tubes and joints 

 may be readily examined. 



The number, grouping and length of tubes are varied to meet the require- 

 ments of the superheating surface necessary. 



Expansion is taken care of by the form of the tubes together with the use 

 of proper methods of suspension, there being no rigid connection between the 

 manifolds. 



All superheaters present smooth external surfaces which not only offer the 

 least possible resistance to the flow of the gases of combustion but also the least 

 opportunity for the adhesion and collection of dust or soot in quantities sufficient 

 to interfere with the efficiency and uniform operation of the superheater. Such 

 dust as may cling to the tube surfaces may be readily removed by means of a 

 steam lance through doors in the setting furnished for that purpose. 



No flanged joints are exposed to the gases, all tube joints being expanded 

 and the tube ends flared. 



All superheaters are provided with safety valves, the necessity of which has 

 been shown. 



No additional care of the boiler is required because of the installation of 

 Babcock & Wilcox superheaters, and the cost of maintenance and operation is 

 negligible. 



With boilers in which it is possible to introduce the steam into the intake 

 header of the superheater at several points and to provide several outlet connec- 

 tions, an even distribution of the steam through all of the tubes of the superheater 



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