The pumps are the most widely used mechanical machines. They are used to transfer fluids. The pumps have two major types: dynamic pump and positive displacement pump. A positive displacement uses to transfer foam, while a dynamic pump uses to supply water. Both of these pumps work in different ways. The dynamic pump supplies energy to the fluid, increases velocity, which increases fluid pressure. This article deeply explains the different aspects of the dynamic pump.
What is a Dynamic Pump?
A dynamic pump is a type of pump which transfers kinetic energy to the liquid being pumped by a rotating rotor, propeller, or impeller. The dynamic pump is also called a kinetic pump.
This pump adds kinetic energy to a liquid by increasing the flow rate. As the kinetic energy of the liquid increases, the liquid velocity also increases. When this high-velocity liquid passes through the volute casing, the liquid velocity reduces, and pressure increases. The First law of thermodynamics explains this conversion of kinetic energy into pressure.
The dynamic pumps are most commonly employed for water pumping, and positive displacement pumps are most commonly employed for foam. In this pump, a rotating impeller or blade is submerged in the liquid being pumped and housed in a casing to direct the water flow.
Centrifugal pump is a most common example of the dynamic pump.
The priming of the centrifugal pump is very important for the proper operation of the pump. Otherwise, the suction pressure generated will not be enough to lift the fluid and can generate different problems such as pump failure, damage, or overheating.
One of the major drawbacks of dynamic pumps is that they need initial priming for proper operation. However, the PD pumps don’t need priming, and they have a self-priming capacity. A positive displacement pump captures a specific amount of fluid and transfers it from the inlet side to the discharge side.
Types of Dynamic Pumps
The dynamic pump has the following major types:
- Centrifugal Pump
- Vertical centrifugal pump
- Horizontal Centrifugal Pump
- Multistage Pump
- Submersible Pump
- Fire Hydrant System
1) Centrifugal Pump
Centrifugal pump is a most common type of dynamic pump. This pump has a very simple operation. It has an easy design than a positive displacement pump. These types of pumps are efficient, robust, and relatively cheap to manufacture. As the pump starts working, the liquid pressure increases from the inlet to the outlet of the pump. Pressure changes force the fluid to flow out of the system.
This pump increases the pumping force by transferring the rotational power of the motor shaft to the fluid through the rotating impeller. The fluid flow enters the center of the impeller and discharges along with its blade. Therefore, the centrifugal force provided by the impeller increases the speed of a fluid and converts energy, such as kinetic energy, into pressure.
2) Vertical centrifugal pump
This pump is also known as a cantilever pump. It has a special shaft, and the bearings are outside the well to maintain the design, allowing the volume to fall into the well. The vertical pump uses a no-filling container to shield the shaft but also uses a throttle bushing. A parts washer is the most commonly used application of the vertical centrifugal pump.
3) Horizontal Centrifugal Pump
The horizontal centrifugal pump has more than one impeller. These types of dynamic pumps are used for pumping applications.
The horizontal pump has multiple stages. All stages are in similar shelters and mounted on the same shafts. At least eight additional stages can be installed on a solo horizontal axis. Each stage increases the head equally.
4) Multistage Pump
The dynamic pump, which uses more than one stage to pump the fluid, is known as a multistage pump. This pump uses more than one impeller and diffuser.
5) Submersible Pump
The submersible pump is also known as a septic tank pump, sewage pump, and stormwater pump. These dynamic pumps are most commonly used to pump construction water, chemicals, commercial waste, storm water, black water, sewage, domestic and industrial water.
These pumps are suitable for construction sites, stormwater, groundwater, sewage, black water, and treated water.
These pumps are available in different designs, such as grinder pumps, contra-block pumps, cutter pumps, single-channel pumps, multistage pumps, vortex pumps, and closed pumps. You can choose the best pump from multiple options for different applications, including high head, low head, low flow, and high flow.
5) Fire Hydrant System
The hydrant pump system is also called hydrant pump, fire pump, and hydrant booster. These are high-pressure water pumps designed to increase a construction’s fire-fighting capacity by increasing the force within the hydrant service due to insufficient water piping. The fire hydrant systems are most commonly used for irrigation and water supply applications.