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Chemical Pumps


Transporting or conveying chemicals and other chemical products with aggressive, acidic or otherwise challenging properties places special demands on the know-how of chemical pumps and the materials used. Depending on the substance and type of application, a variety of pumps can be employed for the chemical industry.
These can be secondary circuits and applications without direct contact with the chemical medium, as well as applications for direct conveying of chemicals. Specially developed and resistant plastic centrifugal pumps and displacement pumps are available for this purpose.

The right chemical pump for every purpose

Chemical pumps are used for unloading raw materials, their preparation, in processing and in transformation processes up to the storage and in many other areas, such as wastewater treatment. The decision on which pump is used in the end depends chiefly on the chemical properties of the pumped medium and the operational safety aspects.
Further details about the technical features and the possible application areas is located on the detail pages of the respective pump technologies. The chemical pumps manufactured by our members are suitable for all types of applications with and without direct contact with the chemical.

Application examples for chemical pumps

·    Fine chemicals
·    Chlorine chemistry
·    Manufacture of chemical intermediate & end products
·    Production of sulphuric acid
·    Production of fertilizers
·    Steel/stainless steel pickling
·    Acidity regulation
·    Large-scale electroplating
·    Anodizing plants
·    Metals recovery
·    Electrolytic processes
·    Exhaust air scrubber
·    Chemical flue-gas cleaning
·    Hazardous waste treatment
·    Wastewater purification

Pumps for typical chemical fluids and pumped media

·    Organic & inorganic substances
·    Acids & lyes
·    Toxic & carcinogenic media
·    Corrosive fluids
·    Fine chemical products
·    Chemical mixtures
·    Non-conducting fluids
·    Fluids with low solids content
·    Chemical sludge
·    Molten materials
·    Coolants & solvents

Pumps for the chemical industry

Typical pumped media in the chemical industry

·    Abrasive sludge
·    Aluminum oxide sludge
·    Aluminum sludge
·    Ammonia
·    Ammonia water (NH4OH)
·    Sodium hydroxide (NaOH)
·    Bauxite sludge
·    Calcium chloride (CaCl2)
·    Chlorine dioxide (ClO2)
·    Ferric chloride (FeCl3)
·    Liquid sulfur
·    H2SO4 solution
·    Furnace wastewater sludge
·    Refrigerant CO2 R744
·    Refrigerant NH3 R717
·    Hydrocarbon
·    Sodium bisulfite (NaHSO3)
·    Sodium hypochlorite (NaOCl)
·    Sodium phosphate (Na3PO4)
·    Sodium hydroxide solution
·    Phosphoric acid (H3PO4)
·    Nitric acid (HNO3)
·    Hydrochloric acid (HCl)
·    Molten materials
·    Sulfuric acid (H2SO4)
·    Water-glycol mixtures
·    Hydrogen peroxide (H2O2)
·    Paints / varnishes

Successful application examples for Chemical Pumps

For tank and truck unloading applications in the chemical industry centrifugal pumps are often used. Due to the high flow rates and moderate differential heads these kind of pumps brings a huge variety of designs, materials and sealing concepts. Additionally to the chemical resistance, also safety aspects like explosion protection and dry run protection are often important. 

Technologies

radial pumps, side channel pumps

In thermal separation processes like distillation liquids are circulated in a continuous substance stream. Next to proper material selection an additional major problem in these applications is the fact that liquids are often pumped close to their vapor pressure. Pumps used in this kind of applications stand out due to their excellent suction behavior (low NPSH requirements).

Technologies

radial pumps, side channel pumps

Washing water streams in flue gas cleaning areas of industrial plants and waste incineration carry a huge amount of critical ingredients and solid particles. Centrifugal pumps which have to deliver high flow rates additionally have to withstand a corrosive and abrasive exposure.
In addition side processes such as lime milk dosing have similar characteristics. The main requirements for suitable and reliable pump solutions are especially a proper material and shaft seal design.

Technologies

radial pumps

Next to classical water pumps also chemical pumps can be found in industrial wastewater treatment plants. For dosing of lime, hypochlorite or for the collection in a sump pump chemical resistance is a major issue.

Technologies

radial pumps

The production of chlorine in industrial scale is usually be made by electrolytic separation of sodium chloride (NaCl) and hydrogen chloride (HCl). In most cases the high flow rates are suitable for centrifugal pumps. The corrosive characteristic reduces the number of suitable alternatives compared to other applications. In the salt processing as well as in the electrolysis cell and for sodium hydroxide (NaOH) applications nowadays pumps made from plastic as well as titanium and nickel alloys are used.

Technologies

radial pumps

Due to its various properties (e.g. for drying of substrate streams) sulfuric acid is a very important substance for process technologies. However, due to its corrosion behavior this acid is a challenge for materials and machines. It´s behavior changes significantly by variation of temperature and concentration. However, it does not follow the rule “higher concentration leads to higher corrosion”. The reduction of concentration can even lead to a more critical corrosiveness. Pumps for sulfuric acid need to be selected based on temperature and pressure followed by a suitable material and seal concept selection.

Technologies

radial pumps

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