Gases remaining from fuel combustion in the combustion chamber (furnace) are called flue gas. Flue gas combustion results in many still contain grey. Gray liquid contained in the flue gas will stick and freezes when the flue gases reach the area of convection warming in the HRA. Gray liquid that settles can become very hard and is known by the term bird nesting. While fly ash drifting and following the flow of flue gases will stick on the walls of the pipe element that will reduce the efficiency of heat exchanger.
In the process of burning coal, the pipe will be exposed to heat radiation from burning coal so that liquid fluid at inside pipe will evaporated and sent to the steam drum. If the operating area is reviewed the pipe bottom slope that damaged, the pipe looks that work in areas with high temperatures and the pipeline has been operating in quite a long time that is approximately 10 years. This condition can result in changes in the possibilities of the material, as in the nature of a lift.
In addition to the thermal aspects if seen in the pipe position 1, there is another aspect that allows the pipe may have been damaged. The position of the pipe 1 is in place the possibility of the collapse of the remaining solids combustion material. The fall of the material remnants of solids allows collision on the pipeline. This possibility will be investigating.
From information obtained that the pipeline has been operating for about 10 years, namely since 2004. The pipeline has never undergone the turn because it is designed to operate for 30 years. From the information obtained, the type of material the pipe used type SA-210-C where the nature and specific data can be seen in Table 1.1 Pipe Material Properties (source: ASME Section II Part. D) as well as a description of the dimensions of the pipe on the table 1.2.
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