economizer tubes
economizer tubes
(OP)
Why would the outside economizer tubes be welded to the boiler membrane? The boiler is used to burn hog fuel and provide steam for a 20 MW turbine/generator.
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RE: economizer tubes
RE: economizer tubes
RE: economizer tubes
Yes, the leaks could be caused by fatigue damage in service. Are the cracks occurring external to the boiler tube or internal? The reason for my question is that the cracks could be caused by corrosion fatigue along the ID surface of the tube beneath the welded attachment. I have seen this numerous times in waterwall tube circuits. The cracks could also be caused by mechanical fatigue crack propagation because the external fillet weld acts as stress risers along the OD surface of the tube.
You need to confirm the damage mechanism. To do this, grind the crack. If the crack increases in length or results in more spider web cracking, it is probably corrosion fatigue that initiated from the tube ID surface. If the crack disappears from grinding on the OD side of the tube, it is most likely mechanical fatigue damage from the seal weld attachment.
RE: economizer tubes
RE: economizer tubes