Boiler Tube Research (Riser) Part 1

A specimen is number five segments of the riser. This is part of the pipelines that is concerned with processes occurring at of steam drum. Where the drumming cycle of steam is water down through the pipes of steam drum down-comer header under the header into the bottom to distribute the water to the pipes under the header heating ( riser ) are arranged to form a boiler room gas. Despite the riser water is warming and hoisted himself back into the drums of steam.

The pipeline 5 can be seen from figure 4.1. The pipeline is fitted with the 5 horizontal position of pipe with a pipe and other related to the plate mounted by welding.





The report from the improvement of the leak of a pipe at furnace lower header unit 2 by PT. Resounding mighty technique in November 2013, that this pipe never been repaired in November 2013 and operating back on the same month. Crack that there is eliminated by the process of grinding and die penetration done to ensure there is no crack.

Crack that is covered with welded back with the process of GTAW 70S-6 use electrodes in accordance with specifications. Die penetration the last of the results confirmed that the results of welding was in good condition .But not much later found back the crack on the connection between liaison plate and pipe welder (no information about when this incident).

Those who received the condition can be seen from figure 4.2. Next is a visual inspection and it's like looking at a picture 4.3 to 4.4.





It's a visual inspection result of the conclusion can be drawn 5 as follows:
1.There was a crack in the pipe was such a plate.
2.To pass through a crack on the inside of the pipe.

Metallurgy analysis to know the exact cause of the occurrence of cracked, then done tests as follows:
Testing chemical composition and violent material pipe 5 and plate testing aims to prove that there is no mistake in choosing material of a pipe used.Based on information obtained specifications of material 5 pipe used this is SA210C. While to the specifications of plate unknown. The results of the testing of chemical composition and violence will be compared with ASTM A210 standard specification for seamless steel medium-carbon boiler and super-heater tubes.

A conclusion that can be drawn from the results of testing material pipe 5 and plate is:
1 Pipe 5 materials used in accordance with specifications that has been determined.
2 Material plate used is similar with material pipe.

Metallography analysis and violent weld connection of pipe 5 and plate to view with exactly where cracks happened, then done observation macro structure as i was in this picture 4.5 to 4.6.



Continue to Boiler Tube Research (Riser) Part 2.