Pressure tapping pipe of the tower vessel

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In refining units, there are welded pipelines on the towers; for example, in the atmospheric tower of a vacuum distillation unit, two issues arise: 1. What determines the material of the welded pipelines on the tower, such as the oil outlet pipelines and the pipelines for instrument pressure measurement? I don’t know how thick it is? 2. Will corrosion occur over time with prolonged use? 3. After we install the equipment, we will need to work with crude oil from CNOOC that has a high acid value. Modifications are now necessary, with some of the equipment being replaced with 316L material that is resistant to corrosion. Is it necessary to replace the pipelines welded to the tower with materials that are also resistant to corrosion? We just measured the thickness of these pipelines; despite having been in use for several years, their thickness has changed almost none. Please give some advice, I’m learning!