Chemical Pump General Description
Chemical pumps are the units capable of processing a large range of varied corrosive substances. The group of Chemical Pumps includes the units, totally different in terms of their design and operational with liquids that have chemical properties different from the properties of water. pumped substances are chemically active; but, their corrosiveness levels is significantly totally different. the material used to make the pump flow channel parts and therefore the pumping unit design details square measure selected in accordance with the parameters of a substance that the pumping unit is intended.
This type of pumps may be a result of the development of varied branches of industry and therefore the ensuing 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 as 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 of this 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 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.
Quality and tightness of chemical pump rely not solely on the material of the flow channel however also on the kind of a seal between the electrical motor and the flow channel.
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 the high-precision rate of flow, long service life, minimum time spent for maintenance; also, they'll dry, and self-priming is feasible for these pumps.
The range of accessible models is very wide for this type of pumps. 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, aluminum alloys, etc.), type of sealing and motor power.
Chemical pumped liquids
Chemical pumps, in accordance with their application, will pump a really 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 product, 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)
- toxic and radioactive substances.
In addition to wide range of corrosive liquids, several varieties of chemical pumps will operate with neutral media (clean, heavily polluted or moderately polluted) and in the vacuum.
Pump Design details
Chemical pumping plants are used for a wide range of corrosive substances, variable greatly in terms of their composition, density, and temperature. Chemical pumps will differ greatly from one another in terms of their design; but, they need common purpose: operation with highly-active liquids. In accordance with their scope of application, they're divided into pumps for industrial and for 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 pumps are made of extremely corrosion-resistant composite materials. A sealing sleeve is given 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
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'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 are used to pump not solely corrosive substances however additionally neutral substances from varied reservoirs. this type of pumps is straightforward and convenient for operation.
Peristaltic chemical pumps could also be considered as a separate group; they're used, as components of varied systems and processes, for metering of substances. These pumps have the adjustable capability.
The types of same chemical pumping plants may have various modifications depending on the material used to create the flow channel, the shaft waterproofing type, the electrical motor power or the impeller diameter. due to their reliable design and high in operation parameters, these pumps are applicable in any processes resulting in higher quality of output product and most automation of manufacturing technologies.
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