XRD analysis of the deposit part in a pipe 4 on the image 3.34 is part of a pipe in 4 who experienced plastic deformation torn up to. Seen all the difference in color deposit in the area around rips. XRD analysis was conducted in three locations as seen in the picture. And the result can be seen in images 3.35 to 3.37 as well as table 3.11 to 3.13 .
From the analysis result of XRD shown that there is a fine coating of different deposit around the area that get torn. Deposit formed namely namely hematite and chromium carbide. That factors affect the establishment of chromium levels carbide is carbon temperatures and high. If viewed from result test material composition, having pipe 4 of carbon large enough exceed to the maximum levels allowed. And high temperatures experienced pipe 4 cause the possibility of the establishment of this chromium carbide.
Mechanical and thermal analysis in Pipe 3.
Based on analysis of a visual inspection and metallurgy earlier , the greatest damage to the pipe 3 is the depletion of the outer wall. This is because eroded due to depletion of the wall and on occurring thin the part most torn that causes leakage.
Based on this case , which appears that hypothesis is that this happened because of depletion of continuous erosion in the same place in the pipe this 3. The cause of the most experienced is probably misdirected soot blower. High pressure steam produced by the soot-blower carrying accompanied by the possibility of condensed water and fly ash as particles of solid make the mechanism of erosion was faster and exacerbate the process of depletion of the wall in a certain area until the level of the thickness of the walls of certain, pipes are not able to withstand more internal pressure from this re-heater in a pipe , and finally this pressure to tear a pipe and causing leaks. This will then hypothesis' evidenced by a simulation of supporters as described in sub chapter 3.6.
Mechanical and thermal analysis in Pipe 4.
Pertaining to the failure of the 4 it was apparent that the four had crash and a deforming large enough to tear a pipe.The largest of this is because the soot blower experiencing misdirected that strikes the 4th and at the same time the blower supposed to spray the sidelines of the pipes of shifted to the pipeline themselves (in this case the 3rd). Based on the information obtained in the field that was a nuisance to soot blower is stuck at operate ( of no return to the original position since stalled something). This incident had occurred before the pipeline detected damaged on 3 and 4.
If seen from the form of the destruction of the 4 the probability of which is hitting sootblower the fourth part of a thread 3.38 looked at the picture.High temperatures in both inside and outside the operation hours is a long time and is likely to decline in a metal pipe, so that when the next crash damage occurs as mentioned above.Which is based on section of that hypothesis 3.6 will support it.
to be continue to Boiler tube research part 7.
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