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Residue Pumps

The hot, heavy liquid from the bottom of the column was pumped out as a residue, to be used as a fuel oil blending component. As the liquid went through the pipeline, some carbon particles continued to deposit on the pipe walls. The geometry of the alloy steel piping was such that it became very difficult to clean them effectively. The piping layout can be seen in Figure 37.3.

Towards the end of a production run, the pump capacity dropped significantly, and cavitation noise was audible. Seal failures occurred more often at this stage.

Pipeline from Soaker to Fractionating Column

The 80' long, 18" transfer pipeline from the top of the Soaker to the Column was flanged at the two ends. At an early stage of the shutdown, this pipeline was lowered to the ground to enable its internal cleaning. This pipe was reinstalled after all other work was completed, adding eight hours to the shutdown duration. The lifting operation usually resulted in damage to its insulation. This pipe layout is shown in Figure 37.4.

The coke pieces that emerged during the hydro-jet cleaning of this pipe were only about 1/8" thick, and the quantity was about 8 lbs.

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