Learn about the materials used for pipelines in petrochemical catalytic cracking units
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1. The lift pipe shell is made of carbon steel with a heat-insulating and wear-resistant lining. 2. The cold-wall shell of the reaction oil and gas pipeline is also made of carbon steel with a heat-insulating and wear-resistant lining, while the hot-wall shell is made of 15CrMo. 3. The shells of the catalyst feed line and the regenerated catalyst line are made of carbon steel with a heat-insulating and wear-resistant lining, 0Cr17Ni12Mo2. 4. Bellows expansion joints FN2, B315, or Incoloy800. 5. The flue gas pipeline features a carbon steel cold wall casing with an insulating and wear-resistant lining; the temperature of the hot wall casing is ≤650°C, 0Cr18Ni9 ； Hot wall shell temperature > 650°C, 0Cr17Ni12Mo2. 6. Bellows expansion joints FN2, B315, or Incoloy800.
The pipeline materials for petrochemical catalytic cracking units mainly include: – The riser shells and the cold-wall shells of the reaction oil and gas pipelines are made of carbon steel with heat-insulating and wear-resistant linings, while the hot-wall shells are constructed from 15CrMo. - Housings for the raw catalyst pipeline and the regenerated catalyst pipeline: also made of carbon steel with heat-insulating and wear-resistant linings, with 0Cr17Ni12Mo2 being used in some cases. - Flue gas pipeline cold wall shell: carbon steel + heat-insulating and wear-resistant lining ； The material for the hot wall shell is selected based on temperature: 0Cr18Ni9 is used for temperatures ≤650°C, while 0Cr17Ni12Mo2 is used for temperatures >650°C. - Bellows expansion joint: FN2, B315, or Incoloy800 are used. .