Please visit Boiler Tube Re-search (Re-heater) part 3 for previous explanation.






Photo the structure of the analysis result of micro and the depletion of violence in and cracks in the area around 3 a pipe , obtained a conclusion as the following:
1 .The collision occurred not because of the defect of foreign matter , because there is no indication of deformation plastics and micro structure changes occurring in significant .
2 .The results of the violence shows no change the value of violence .
3 .Of the results of a photograph of SEM seen that happened due to pressure from a crack in a pipe .
4 .At the end of the results of a fissure EDX found no indication of the elements that can cause the occurrence of corrosion that causes crack.

Observation of the structure of micro and shem done by cutting pipe damaged as seen in images 3.22 and 3.23, besides that micro structure observations also done in the area in a pipe that is far from a damaged.





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Please visit Boiler Tube Research Part 2 (Re-heater) for previous explanation.

Were also conducted a visual inspection at the pipe 4. The result can be seen in picture 3.15 - 3.13.






From the results of a visual inspection pipe 4 a conclusion can be drawn as follows:
1 .Impose a defect in the form of deformation plastics on the outer wall of a pipe 4 .Deformation plastics that occurs allegedly caused by the presence of a clash of foreign matter from outside a pipe to tear a pipe .
2 .Did not find the walls of the occurrence of depletion of passage in a tubular .
3 .Found the presence of thin deposit in the area around rips but not excessive on an area of around torn .
4 .No findings of the existence of the ravages of corrosion on the inside of the pipe , like pitting corrosion , caustic corrosion and the type of corrosion.

Analysis of the metallurgy to test the truth of the conclusions on the results of a visual inspection , then done a series of testing to prove it.

Testing the chemical composition and violent pipe 3 and 4 is aimed at testing to prove that there is no mistake in choosing material a pipe used .The specifications of a pipe re-heater material used this is SA-213-T12 .

Testing is intended to prove that there is no mistake in choosing material a pipe used .
The specifications of a pipe re-heater material used this is sa-213-t12 .The results of testing the chemical composition and violence will be compared with ASTM A213 standard specification for seamless ferritic and austenitic alloy-steel boiler , super-heater and heat an exchanger tubes. The results of testing the chemical composition and the violence and the specifications of its standard can be seen in table 3.4 and 3.5 .



A conclusion that can be drawn from the results of pipe testing material is material pipe number 3 and 4 which used in accordance with specifications as specified.

Observation micro structure necessary to see change in phase is there or structure a microcomputer that occurs during the course of a pipe used .And also to prove that the damage to a pipe do happen by erosion not while in other .Sample taken from a pipe that experienced depletion ( figure .3.16 and 3.17 ) .The results of a photograph the structure of micro and SEM is presented in figure 3.18 - 3.21 .Violent test will be done on these sample and the result can be seen in table 3.6.

Continue to Boiler tube research (Re-heater) Part 4.

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Please visit Boiler Tube Research Part 1 (Re-heater) for previous explanation.

Visual Inspection.
Two pipes re-heater damaged and are still attached can be seen from figure 3.3. Temporary conditions pipe 3 and 4 pipe received can be seen from figure 3.4 and 3.5.




A visual inspection then will be on pipe 3.The results can be seen from figure 3.6 to 3.12







From the results of a visual inspection a pipe number 3 can be drawn conclusions as follows:
1 .Find any thinning of the walls of the pipe of the outer being allegedly caused by erosion.
2 .Find any torn on a pipe that has least thickness , allegedly caused by no longer able to withstand pressure from in a pipe.
3 .Not the wall found the occurrence of depletion of passage in a tubular.
4 .There was no evidence excessive deposit on an area of around torn.
5 .Not findings of the damaged due to corrosion in passage in a tubular , pitting as corrosion , caustic corrosion and kind of corrosion that endangers the other

Continue to Boiler Tube Research (Re-Heater) Part 3.

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