Chemical pumps are the units capable to process a wide range of various corrosive substances. The group of chemical pumps comprises the units, different in terms of their design and operating with liquids that have chemical properties different from the properties of water. Pumped substances are chemically active; however, their corrosiveness levels can be significantly different. The material used to make the pump flow channel components and the pumping unit design details are selected in accordance with the parameters of a substance for which the pumping unit is intended.
This type of pumps is a result of development of various branches of industry and the resulting necessity to process caustic materials, with the design components remaining undamaged. However, some types of chemical pumps are applicable for operation with neutral substances or vacuum, or for various temperatures under increased pressure.
The highest-quality materials are used to make chemical pumps. Low quality of materials used for making the elements of a pumping plant can result in rapid wear, unit failure or malfunction of the process chain as a whole. It should be specially noted that grey cast iron is rarely used for making flow channels in pumps of this type, because this material is prone to destruction by corrosive liquids, resulting in iron ions released into pumped media; also, this material is unsuitable to keep high pressure at suction section of a pump.
The following materials are used to make flow channels of chemical pumps:
Quality and tightness of chemical pumps depend not only on the material of the flow channel but also on the type of a seal between the electric motor and the flow channel.
Pumped substance is isolated in a hose in chemical pumps (no seals used); as a result, these pumps are reliable and safe, and their operating characteristics are high. These pumps demonstrate high-precision flow rate, long service life, minimum time spent for maintenance; also, they can run dry, and self-priming is possible for these pumps.
The range of available models is especially wide for this type of pumps. Similar to other pumping plants, chemical pumps are classified, in terms of their design, into several types, such as vortex pumps, submersible pumps, glandless pumps, unit construction pumps, cantilever pumps etc. Each group differs by material type (bronze, cast iron, steel, titanium, aluminum alloys, etc.), type of sealing and electric motor power.
Chemical pumps, in accordance with their application, can pump a very wide range of liquids. These pumping plants are primarily intended for operation with the types of substances as follows:
In addition to wide range of corrosive liquids, several types of chemical pumps can operate with neutral media (clean, heavily polluted or moderately polluted) and in vacuum.
corrosive media (graphite pumps)
amino alcohols: monoethanolamine, diethanolamine
viscoul liquids and media
aqueous solution of methyl diethanolamine
aqueous solution of saturated amine
water with sediments
water with hydrogen sulphide
dimethylsulphide, organic sulphides
ash and slag
condensate water steam condensate
|condensate of acidic water and methyl diethanolamine
petroleum fractions containing sulphuric acid
methyl diethanolamine solution
regenerated aqueous amine solution
reverse osmosis system
mixture of acids
alcohol, ethylene glycol
ammonium uranyl tricarbonate
phosphorus sludge, acidic runoffs
alkalis (soda-circulating pumps)
ethylene glycol (solution)
Chemical pumping plants are used for a wide range of corrosive substances, varying greatly in terms of their composition, density and temperature. Chemical pumps can differ greatly from each other in terms of their design; however, they have common purpose: operation with highly-active liquids. In accordance with their scope of application, they are subdivided into pumps for industrial and for domestic purposes. The major groups of chemical pumping plants in terms of their design are as follows:
These pumps can move acids, caustic alkalis and solvents at temperatures up to 120°C.
These pumps are made of highly corrosion-resistant composite materials. A sealing sleeve is provided with double polymeric coating for operation at high pressures. A seamless impeller has very high chemical barrier. An outer magnetic coupling is corrosion-resistant.
1. Drainage discharge from the volute-type casing
2. Pump casing (interchangeable)
3. Shaft support
4. Replaceable ring
6. Main bushing with a chute (to remove solid particles from the pump)
8. Slot sealing
9. Sealing sleeve (special polymer sealed by composite)
10. Rear supporting member
11. Magnetic coupling (outer part)
In accordance with the submersion type, chemical pumps may be classified into submersible pumps and drum pumps. The design of submersible pumping units is vertical; they are actively used in chemical industry. Pump components operating in contact with corrosive media are made of polymers, chemically passive alloys or stainless steel. The submersion depth is 1 m or, if the extension is applied, 2 m. Drum pumping units are used to pump not only corrosive substances but also neutral substances from various reservoirs (such as containers, drums, baths etc.). This type of pumps is simple and convenient for operation.
Peristaltic chemical pumps may be considered as a separate group; they are used, as components of various systems and processes, for metering of substances. These pumps have adjustable capacity (10…100%).
The types of aforementioned chemical pumping plants may have various modifications depending on the material used to make the flow channel, the shaft sealing type, the electric motor power or the impeller diameter. Due to their reliable design and high operating parameters, these pumps are applicable in any processes resulting in higher quality of output products and maximum automation of manufacturing technologies.
We are convinced that our company ENCE GmbH will become your reliable and efficient distributor (authorized representative) of your chemical pumps in the Russian market.
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