Comparison Table of Process Piping Materials and Media

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Table 1: Comparison of process pipeline materials and media. 1. Carbon steel 20#, Q235-B: Plant air, factory air, nitrogen, low-pressure steam, medium-pressure steam, cooling water, circulating water, chilled water supply, chilled water return, hot water, production wastewater, domestic wastewater, oily wastewater and polluted rainwater, wastewater, 20% NaOH solution, fuel gas, hydrogen, natural gas； Process media: mixed C4, ethylene, propylene, butadiene, methane, toluene, methanol, isopentane, hexane, n-hexane, pyrolysis gas, ethylene glycol, liquid fuel (shochol), light components, heavy components, pyrolyzed C4, acetylene-containing C4, stripped C4, heavy C4, flare gas, wax liquid, 93–98% concentrated sulfuric acid, butene-1, hexene-1, n-butanol, octanol, isobutanol, C5 ； Oil-based media: crude pyrolysis gasoline, modified oil, washing oil, hydrocracked gasoline, heavy fuel oil, light fuel oil ； Mixed naphtha, hydrocracking tail oil, etc ； 2. Molybdenum steel 15CrMoG: High-temperature and high-pressure steam (385–430°C, 3.8 Mpa–4.2 Mpa); 3. CS (resistant to hydrogen sulfide): Ammonia-rich liquid, overhead gas from stripping towers, low-pressure acidic gas, sulfur-containing wastewater ； 4. Stainless Steel 304SS: Syngas, demineralized water, lubricating oil ； 5. Stainless Steel 304LSS: monoethylene glycol, diethylene glycol, triethylene glycol, oxygen ； 6. Low-temperature steel A333-6: Ethylene (liquid) (operating temperature -35°C), ethylene equilibrium gas (design temperature -45/65°C), ethylene (liquid) (design temperature -45/65°C) ； 7. Low-temperature steel A333-7: Propylene (design temperature -50/90°C), high-pressure torch (design temperature -50/200°C) ； 8. Galvanized carbon steel: instrument air