X-Ray Diffraction (XRD) analysis passage deposit in a tubular although the internal parts pipe invisible from excessive deposit, but XRD analysis needs to be done to convince absence of the internal factor of pipes caused the damage pipe. Passage in a tubular scraped off until obtained a number of enough to do the XRD analysis (Picture 1.11) . The results can be seen from Figure 1.12 and Table 1.6
From the results of XRD analysis in the area around defects can be inferred that the deposit begins to form Calcium Oxide and Aluminum at Carbonate areas around the basin in the pipe undergoing plastic deformation. Deposits that are formed are still very thin.
Thermal and Mechanical Analysis.
Analysis of mechanical and Thermal damage to the pipe 1 based on visual inspection is the defects in the form of basins toward the inside of the pipe as shown in Figure 1.6 and 1.7.
This in theory there are defects when plastic deformation occurs. This kind of deformation occurs when the strength of the Von Mises strength has reached melt material.
The occurrence of a large strength in this case predicted to occur due to foreign bodies falling in a certain height in the furnace with the speed of the collision are relatively large.
The strength which occurs due to the collision of these foreign objects may be aggravated by the influence of the thermal load is, the temperature difference between inner and outer pipe causing a thermal gradient is relatively large. Extremely high temperatures generated by flue gas pipe outside hours of operation as well as a long pipe (about 87.600 hours) may cause a decrease in the quality of the material itself.
In other words, that at a time when foreign bodies that fell upon the pipe, the pipe is not in the best State performance to withstand plastic deformation happens. Hypothesis-this hypothesis is proved by simulation support
to be continue to Simulation Analysis Supported on Boiler Tube Research (Bottom Slope) Part 5.
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