CHEMICAL PUMPS
Chemical pumps are units capable of processing an extensive range of various corrosive substances. Pumped substances are chemically active, but their corrosiveness levels are significantly different. The group of Chemical pumps includes the units, totally different in their design and operation with liquids with chemical properties other than water. The material used to make the pump flow channel parts, and, therefore, the pumping unit design details square measure selected by the parameters of a substance that the pumping unit is intended.
This type of pump may result from the development of varied branches of industry and, therefore, the necessity to process caustic materials, with the look elements remaining undamaged. However, some types of Chemical pumps are applicable for operation with neutral substances or vacuum or for varied temperatures below increased pressure.
The highest-quality materials are used to create Chemical pumps. The quality of materials used for making the elements of a pumping plant may result in speedy wear, unit failure or malfunction of the process chain a full. It ought to be specially noted that grey cast iron isn't used for making flow channels in pumps of this type; as a result, is material is liable to destruction by corrosive liquids, leading to iron ions discharged into pumped media; also, this material is unsuitable to stay air mass at the suction section of a pump.
The following materials are wont to create flow channels of this sort of pump:
- chrome-nickel steel, chrome-nickel alloy steel or chrome-nickel Mo copper steel;
- high-alloy or metallic element oxide forged iron;
- titanium alloys;
- polypropylene.
The chemical pump quality and tightness rely not solely on the material of the flow channel but also on the kind of seal between the electrical motor and the flow channel.
The pumped substance is isolated in an exceeding hose in Chemical pumps (no seals used); as a result, these pumps are reliable and safe, and their operational characteristics are high. These pumps demonstrate a high-precision flow rate, long service life, and minimum time spent on maintenance; also, they'll dry, and self-priming is feasible for these pumps.
The range of accessible models is extensive for this type of pump. Almost like alternative pumping plants, chemical pumps are classified, in terms of their design, into several varieties, like vortex pumps, submersible pumps, glandless pumps, unit construction pumps, cantilever pumps etc. every group differs by material type (bronze, cast iron, steel, titanium, aluminium alloys, etc.), type of sealing and motor power.
Chemical pumped liquids
In accordance with their application, chemical pumps will pump a wide range of liquids. These pumping plants are primarily intended for operation with the types of substances as follows:
- corrosive, poisonous and highly-active (alkalis, acids, petroleum products, solvents)
- abrasive and caustic liquids
- substances containing gasses
- fibrous substances
- corrosive and viscous substances
- substances containing solid inclusions and suspensions
- explosive, toxic and highly flammable substances
- volatile and liquefied gasses (Freon/ammonia)
- poisonous and radioactive substances.
In addition to a wide range of corrosive liquids, several varieties of Chemical pumps will operate with neutral media (clean, heavily polluted or moderately polluted) and in a vacuum.
Pump Design details
Chemical pumping plants are used for various corrosive substances, varying wildly in composition, density, and temperature. Chemical pumps will differ significantly from one another in terms of their design, but they need a common purpose: operation with highly-active liquids. Per their scope of application, they're divided into pumps for industrial and domestic functions. The main groups of Chemical pumping plants in terms of their design are as follows:
- Pump casing
- Impeller
- Shaft sealing
- Shaft
- Bearing oil chamber sealing
- Bearing support
- Load-bearing member
- Oil level inspection hole
These pumps will move acids, caustic alkalis, and solvents at high temperatures.
These Chemical pumps are made of highly corrosion-resistant composite materials. A sealing sleeve is given a double polymeric coating for operation at high pressures. A seamless blade has a terribly high Chemical barrier. An outer magnetic coupling is corrosion-resistant.
- drainage discharge from the volute-type casing
- Pump casing
- Shaft support
- replaceable ring
- Impeller
- Main bushing with a chute (to take away solid particles from the pump)
- Shaft
- Slot sealing
- sealing sleeve (special polymer sealed by composite)
- Rear supporting member
- Magnetic coupling (outer part)
- Adapter
According to the submersion type, chemical pumps may be classified into submersible and drum pumps. The design of submersible pumping units is vertical; they're actively utilized in industry. Pump elements operational 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 pump not solely corrosive substances but also neutral substances from varied reservoirs. This type of pump is straightforward and convenient for operation.
Peristaltic chemical pumps could also be considered a separate group; they're used, as components of various systems and processes, to meet substances. These pumps have adjustable capabilities.
The same Chemical pumping plants may have various modifications depending on the material used to create the flow channel, the shaft waterproofing type, the electric motor power or the impeller diameter. Due to their reliable design and high operation parameters, these pumps are applicable in any process resulting in a higher quality output product and most automation of manufacturing technologies.
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