The document discusses considerations for selecting a pumping system, including fluid characteristics, system requirements, pump types, drive selection, and standby requirements. Key factors in pump selection are fluid type, system head curve, potential modifications, operational mode, required margins, and space/layout constraints. Reciprocating pumps are used for small liquid chemical metering while centrifugal pumps are common for a wide range of head and capacity needs. Net positive suction head (NPSH) must also be considered to ensure proper pump operation and avoid cavitation.
Centrifugal pumps work by using an impeller to increase the pressure and flow of a liquid. Liquid enters the center of the impeller and is accelerated outward by the curved blades of the impeller. This increases the pressure and flow of the liquid. Calculating the required head of a centrifugal pump involves accounting for static head, pipe friction losses, and adding additional head for safety. Proper pump selection is based on matching the required head and flow rate to the pump performance curves. Cavitation and ensuring adequate Net Positive Suction Head (NPSH) are also important considerations for centrifugal pump operation.
The document discusses different types of pumps used in fluid transport systems. It describes positive displacement pumps which use a fixed volume cavity to trap and transport fluid with each cycle. Dynamic pumps are also discussed, which add momentum to fluid without a fixed volume. Centrifugal pumps are described in detail, with their construction, working principle, performance parameters and efficiency calculations explained. The key aspects covered are the use of impellers to impart energy and velocity to fluid which is then converted to pressure by the volute casing.
The document discusses considerations for selecting a pumping system, including fluid characteristics, system requirements, pump types, drive selection, and standby requirements. Key factors in pump selection are fluid type, system head curve, potential modifications, operational mode, required margins, and space/layout constraints. Reciprocating pumps are used for small liquid chemical metering while centrifugal pumps are common for a wide range of head and capacity needs. Net positive suction head (NPSH) must also be considered to ensure proper pump operation and avoid cavitation.
Centrifugal pumps work by using an impeller to increase the pressure and flow of a liquid. Liquid enters the center of the impeller and is accelerated outward by the curved blades of the impeller. This increases the pressure and flow of the liquid. Calculating the required head of a centrifugal pump involves accounting for static head, pipe friction losses, and adding additional head for safety. Proper pump selection is based on matching the required head and flow rate to the pump performance curves. Cavitation and ensuring adequate Net Positive Suction Head (NPSH) are also important considerations for centrifugal pump operation.
The document discusses different types of pumps used in fluid transport systems. It describes positive displacement pumps which use a fixed volume cavity to trap and transport fluid with each cycle. Dynamic pumps are also discussed, which add momentum to fluid without a fixed volume. Centrifugal pumps are described in detail, with their construction, working principle, performance parameters and efficiency calculations explained. The key aspects covered are the use of impellers to impart energy and velocity to fluid which is then converted to pressure by the volute casing.
