ACCESSIBILITY The means of access to the interior of the superheater 

 boxes and to all expanded joints is through handholes, as has been described. 

 These handholes are readily accessible from the space behind the hanging 

 bridge wall above the third pass of the boiler. 



A large cleaning door in the side wall of the boiler setting in front of the 

 hanging bridge wall gives access to the space 

 below, above and between the superheater tubes. 

 Square superheater dusting doors in the side 

 walls provide means of blowing any accumulation 

 of dust from the superheater tubes. 



FLOODING DEVICE In the early design of 

 the Babcock & Wilcox superheater as applied 

 to Babcock & Wilcox boilers, a device was fur- 

 nished for flooding the superheater during such 

 time as steam was being raised. This was sup- 

 plied as protection against the possible overheating of any superheater parts. 

 While extended experience has shown that such a device is not a necessity, still 

 it is furnished in a number of instances as a regular part of the superheater 

 equipment simply as a super-precautionary means of protection. While The 

 Babcock & Wilcox Co. recommend the use of a flooding device, they do not 

 insist upon it. 



Cores are sometimes used in Babcock & Wilcox superheaters when installed 

 in Babcock & Wilcox boilers. This is done in special constructions where the 

 employment of cores leads to a better steam distribution than would be obtained 

 without their use. 



SUPERHEATER DUSTING 

 DOORS 



55 



