Classification of chemical pumps
Thread Content
Today I came across the classifications of pumps, and I’d like to share them with you. (1) Classification based on working principle and structure: 1) Vane pumps: These pumps use the rotation of the pump shaft to drive various impeller blades, which apply centrifugal or axial force on the liquid in order to transport it to pipes or containers; examples include centrifugal pumps, vortex pumps, mixed-flow pumps, and axial flow pumps. 2) Positive displacement pumps: Pumps that transport liquids by utilizing the continuous change in the volume inside the pump cylinder, such as reciprocating pumps, piston pumps, gear pumps, and screw pumps. 3) Other types of pumps: There are electromagnetic pumps that use electromagnetism to transport liquid electrical conductors ； Pumps that use fluid energy to transport liquids, such as jet pumps and air lifters. (2) Classification by chemical industry application: 1) Process flow pumps: including feed pumps, return pumps, circulation pumps, flushing pumps, sewage pumps, make-up pumps, discharge pumps, etc. 2) Utility pumps: including pumps for boilers, cooling towers, fire protection systems, and deep well pumps for water supply. 3) Auxiliary pumps: including lubricating oil pumps, seal oil pumps, pumps for hydraulic transmission, etc. 4) Pipeline transfer pumps: pumps for oil pipelines, pumps for loading and unloading vehicles, etc. (3) Classification by conveying medium: 1) Water pumps: including clean water pumps, boiler feed water pumps, condensate pumps, and hot water pumps. 2) Corrosion-resistant pumps: including stainless steel pumps, high-silicon cast iron pumps, ceramic acid-resistant pumps, impermeable graphite pumps, rubber-lined pumps, rigid polyvinyl chloride pumps, shielded pumps, diaphragm pumps, titanium pumps, etc. 3) Impurity pumps: including slurry pumps, sand pumps, sewage pumps, coal powder pumps, ash pumps, etc. 4) Oil pumps: cold oil pumps, hot oil pumps, slurry oil pumps, liquid hydrocarbon pumps, etc. (4) Classification by operating conditions: 1) High-flow and low-flow pumps: with flow rates of 300 m³/min and 0.01 L/min respectively ； 2) High-temperature pumps and low-temperature pumps: up to 500°C in temperature, down to -Z53℃ ； 3) High-pressure pump and low-pressure pump: The high pressure reaches 200 MPa, with a vacuum level of 2.66–10.66 kPa (20–80 mmHg) ； 4) High-speed pump and low-speed pump: high speed up to 24,000 r/min, low speed 5–10 r/min ； 5) Precise metering pump: Flow measurement accuracy of ±0.3% ； 6) High-viscosity pumps: viscosity reaching several thousand Pa·s.
Which category do shielded pumps and magnetic pumps belong to?
Shielded pumps and magnetic pumps belong to centrifugal pumps, which fall under the broader category of vane pumps. I have always failed to understand how pump machines are classified according to chemical industry applications, and what are the differences between pumps classified in this way? Can someone reply and explain it?
I think classification is somewhat useful for management purposes; in practice, there’s no rule stating that a vane pump must be used to transfer liquids, and a positive displacement pump cannot be used either. Training new employees might be necessary, but it doesn’t have much practical value. What the boss wants is to achieve the most with the least amount of money, don’t you think?
Found online and shared with everyone – basic knowledge about pumps. 1. Definition of a pump: A pump is a fluid machine used for transporting liquids; it transfers the energy from a prime mover or some other energy source to the liquid, thereby increasing the liquid’s energy (potential energy, pressure energy, or kinetic energy). II. Classification of Pumps Based on their working principle, pumps can be roughly divided into three categories: 1. Dynamic pumps, also known as impeller pumps. Their principle involves using a rotating impeller to exert force on the liquid, thereby continuously transferring energy to it and increasing its velocity and pressure energy; subsequently, most of this velocity energy is converted into pressure energy in the discharge chamber. The main types include: centrifugal pumps, axial flow pumps, partial-flow pumps, and vortex pumps, etc. 2. Positive displacement pumps work on the principle of periodic changes in the sealed working volume that contains the liquid; this causes energy to be transferred to the liquid periodically, thereby increasing its pressure until the liquid is forced out. The main types include: gear pumps, piston pumps, plunger pumps, diaphragm pumps, screw pumps, vane pumps, Roots pumps, and liquid ring pumps. 3. Other types of pumps, such as jet pumps, water hammer pumps, and electromagnetic pumps. The detailed classification of pumps is shown in the table below:
Dynamic pumps: Centrifugal pumps (single-stage – single-suction, double-suction, self-priming, non-self-priming; multi-stage – segmented, volute type); Mixed-flow pumps; Volute pumps, guide-vane types (fixed vanes, adjustable vanes); Axial flow pumps (single-stage – fixed vanes, adjustable vanes; multi-stage – fixed vanes, adjustable vanes). Partially positive displacement pumps: Vortex pumps (single-stage, double-stage, self-priming, non-self-priming). Positive displacement pumps: Reciprocating pumps; Piston pumps (single-cylinder, multi-cylinder) ； Plunger pump (single-cylinder, multi-cylinder) ； Diaphragm pump, rotary pump, gear-type (internal meshing, external meshing) ； Screw pumps (single, double, triple screw) ； Single-screw pump with positive displacement ； Vane pump (single-acting, double-acting) ； Roots pump ； Liquid ring pumps (single-stage, two-stage), other types of pumps: jet pumps, water hammer pumps, gas lift pumps, turbine pumps, and electromagnetic pumps, etc
Dynamic pumps: Centrifugal pumps (single-stage – single-suction, double-suction, self-priming, non-self-priming; multi-stage – segmented, volute type); Mixed-flow pumps; Volute pumps, guide-vane types (fixed vanes, adjustable vanes); Axial flow pumps (single-stage – fixed vanes, adjustable vanes; multi-stage – fixed vanes, adjustable vanes). Partially positive displacement pumps: Vortex pumps (single-stage, double-stage, self-priming, non-self-priming). Positive displacement pumps: Reciprocating pumps; Piston pumps (single-cylinder, multi-cylinder) ； Plunger pump (single-cylinder, multi-cylinder) ； Diaphragm pump, rotary pump, gear-type (internal meshing, external meshing) ； Screw pumps (single, double, triple screw) ； Single-screw pump with positive displacement ； Vane pump (single-acting, double-acting) ； Roots pump ； Liquid ring pumps (single-stage, two-stage), other types of pumps: jet pumps, water hammer pumps, gas lift pumps, turbine pumps, and electromagnetic pumps, etc
The classification is not important; what matters is how to choose the right type of pump.