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    What kind of medium do chemical process pumps mainly transport?

    Publication Date:

    2025-06-19

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    Chemical Process Pump It is a pump model uniquely named among chemical pump types. What kind of materials are these chemical process pumps mainly used to transport?

    From a professional perspective, the material selection for chemical process pumps is far more complex than ordinary pumps. Many users only pay attention to the medium during selection, neglecting the equally critical temperature and pressure. As the "heart" of the chemical production line, the material choice of chemical process pumps directly depends on the chemical properties, temperature, pressure, particulate content, and cleanliness requirements of the transported medium. The core principle is to resist corrosion, wear, and ensure safety and long service life.

    We can understand what materials chemical process pumps can transport from the following aspects, or in other words, how to select pump models based on the medium?

    If you are transporting the following types of media, you can choose the pump body material according to the nature of the medium.

    Metal Materials (Corrosion Resistant / High Temperature and Pressure Resistant)

    Austenitic Stainless Steel (Mainstream Choice)

    304/304L: Transports mildly corrosive media (room temperature dilute sulfuric acid, organic solvents), cost-effective.

    316/316L (with molybdenum): Resistant to moderate corrosion (phosphoric acid, acetic acid, seawater), most commonly used in chemical industry.

    904L/254SMO (Super Austenitic): Resistant to strong acids (concentrated sulfuric acid), chloride-containing media (such as brine).

    Applicable scenarios: Acid/alkaline liquids, organic solvents, process water transportation.

    Duplex Stainless Steel (Strength + Corrosion Resistance)

    2205 (S31803): Resistant to chloride stress corrosion, used for chloride-containing media (seawater, bleach solution).

    2507 (S32750): Superior pitting resistance compared to 316L, suitable for high-temperature chloride environments (such as desulfurization systems).

    Advantages: Strength is twice that of 316L, allowing thinner pump walls to reduce costs.

    Nickel-Based Alloys (Extreme Corrosion Resistance)

    Hastelloy C276 (Ni-Mo-Cr): Universal corrosion resistance, resistant to boiling hydrochloric acid, mixed acids (nitric acid + hydrofluoric acid).

    Monel 400 (Ni-Cu): Resistant to hydrofluoric acid, high-temperature alkaline liquids (such as caustic soda evaporation section).

    Inconel 625 (Ni-Cr): Resistant to high-temperature oxidation (flue gas desulfurization).

    Scenarios: Strong acids (hydrochloric acid, hydrofluoric acid), high-temperature and high-concentration alkaline liquids.

    Titanium and Titanium Alloys

    Gr.2 (Industrial Pure Titanium): Resistant to seawater, wet chlorine gas, sodium hypochlorite (core material in chlor-alkali industry).

    Gr.5 (Ti-6Al-4V): High strength and corrosion resistance, used in aerospace-grade chemical pumps.

    Lined Pumps (Metal Shell + Non-Metallic Liner)

    Fluoroplastic Lining (FEP/PTFE/PFA):

    Resistant to strong acids/alkalis: Concentrated sulfuric acid, hydrofluoric acid, aqua regia (feed pumps for reactors).

     

    [For more information on DF type multistage chemical pumps including models, parameters, selection, and quotation plans, please click the image above]

    Disadvantages: Poor resistance to negative pressure difference and wear.

    Non-Metallic Materials (Strong Corrosion Resistance / High Cleanliness)

    Rubber Lining (Natural Rubber / Butyl Rubber): Resistant to abrasive slurries (mining acid leaching pumps).

    All-Plastic Pumps (Light Corrosion / Clean Media)

    PP (Polypropylene): Acid/alkaline liquids ≤80°C (wastewater treatment dosing pumps).

    PVDF (Polyvinylidene Fluoride): Resistant to solvents (acetone, toluene), high-purity chemical liquids (semiconductor industry).

    Ceramic Pumps (Super Wear-Resistant / Ultra-High Purity)

    Alumina / Silicon Carbide Ceramics:

    Resistant to particle wear (slurries with solid content ≤30%, such as titanium dioxide transport).

    Zero metal contamination (lithium battery materials, electronic-grade chemical transport pumps).

    Of course, the corrosion resistance of the same medium can vary greatly under different concentrations/temperatures (e.g., carbon steel for 80% sulfuric acid, 316L for 30% sulfuric acid). Material selection must be based on actual site conditions.

     

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