Posted by Hero on August 22, 2000 at 11:58:01:
In Reply to: Re: Leaking mud drum tubes posted by uusrand on April 18, 2000 at 23:50:16:
: : We have a customer with a 1980's B&W watertube boiler. A group of tube holes in the mud drum all in the same general location at the back of the boiler appear to be out of round. When we installed new tubes and rolled them in, they held fine during the hydro, however in anywhere from a day to three weeks the same group of tubes started leaking. After re-rolling the tubes the problem comes right back. Does anyone have any experience with or recommendations to fix these out of round holes, has anyone ever used a copper or steel sleeve in a similar application ?
It is the experience of my company that tube seat failure in this manner is associated with flow/temperature variations.The problem should not be the out of round hole, depending upon the difference in the two measured axis,hole elongation is common in wall headers etc.Sleeves have never been used by ourselves,re-machining has been the most cost effective route in very bad instances.Please contact should you require further info.
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