There is one more important section of PUMPS for chemical engineer in almost all type of process industries. Pumps are the devices used to raise or transfer the fluid by means of physical or mechanical action. Pumps are also used to control flow rate or pressure of the to the fluid. They are the best devices to increase the fluid velocity, its mechanical energy, its pressure, or all of them. i.e. the pumps take the low pressure fluid , provides energy to the system for creating the difference in the pressure, and throw the fluid with high pressure. While the density of the liquid changes negligibly, so can be taken as the constant.
1) Types Of Pumps
Although there are few more classifications of the pumps, but there are two most general and basic classification of the pumps for a process engineer.
1.1) Rotadynamic Pumps
These type of pumps generally rotate at higher velocities, hence converting the kinetic energy of the system to the pressure energy. for the purpose, their structure is made up of bladed impellers, which rotate with in the fluid to create the tengential acceleration, hence increase in energy of the fluid.
The rotadynamic pumps are further divided into several categories :
These type of pumps apply the pressure directly to the fluid, unlike the rotadynamic pumps, which generates the pressure energy in the fluid. The positive displacement pump causes a fluid to move by trapping some amount of the fluid and then by displacing that trapped amount of fluid into the discharge pipe. This trapping and releasing results in a direct increase in pressure. These type of pumps can be further classified as:
1) Types Of Pumps
Although there are few more classifications of the pumps, but there are two most general and basic classification of the pumps for a process engineer.
- Rotadynamic pumps
- Positive displacement pumps
1.1) Rotadynamic Pumps
These type of pumps generally rotate at higher velocities, hence converting the kinetic energy of the system to the pressure energy. for the purpose, their structure is made up of bladed impellers, which rotate with in the fluid to create the tengential acceleration, hence increase in energy of the fluid.
The rotadynamic pumps are further divided into several categories :
- Air operated pumps
- chemical injection pumps
- Centrifugal pumps ( mostly used type of pumps in process industries
These type of pumps apply the pressure directly to the fluid, unlike the rotadynamic pumps, which generates the pressure energy in the fluid. The positive displacement pump causes a fluid to move by trapping some amount of the fluid and then by displacing that trapped amount of fluid into the discharge pipe. This trapping and releasing results in a direct increase in pressure. These type of pumps can be further classified as:
- rotary type pumps
- Lobe pumps
- The Wendelkolben pumps/ helical twisted root pumps
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