Posted by matty (a) on May 20, 2000 at 17:11:00:
In Reply to: Boiler Failures - Furnace tube to tubeplate posted by Mike White on January 28, 2000 at 14:17:05:
: nd I have on my basic website a photo of a recently found defect. The defect is about 3/4 of the way through the furnace tube. Luckily the defect was found before catastophic failure.
: I am after information concerning the design of the tubeplate and the calculation of stresses in the joint. It is undoubtably the cyclic stress combined with weld undercut that is the major contributor to failure, another is sometimes the presence of scale. In the UK we check the welds every 5 years with UT.
We are a service company in australia that encounters this on a regular basis and we also re tube boilers but however we do not recommend that ut be done ever five years we do it anually complete with mag partical testing to the furnace tube plates front and rear as tube plate cracking is also a main factor to consider we also make repairs to these parts should you require further info drop me a e-mail regaurds matty (a)
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