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Posted by Craig Butler on August 09, 2004 at 05:34:17:
In Reply to: Re: 3rd Class Exam Questions posted by Rodocite on August 02, 2004 at 05:52:32:
: i believe tube belling is:
: this is the way in which the tubes in a boiler are secured at the ends to prevent the ends from burning off or leaking.
: in firetube boilers, the tube ends are 'beaded' to prevent them from burning off or weakening at the ends.
: in water tube boilers, the ends of tubes are 'flared' so that there will be no leakage at the end of the tubes.
: (im sure about how the types of belling on the tubes, but as for the reasons i posted, im only about 80% sure that the water tubes are "flared" to deal with leakage. so correct me if im wrong.)
Yes in water tube boilers the tube ends are rolled in the drums. I worked in a pulp mill in the past and we developed major leaks in our two recoveries after water treatment was changed and had to replace a number of tubes. The rolling part takes the longest as only two guys are working together in the drums to roll these tubes in to place.