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When it comes to selecting a centrifugal pump for a particular application, it is crucial to ensure that the pump is sized correctly to meet the flow and pressure requirements of the system. In pump sizing, two key factors are needed to determine the appropriate pump size: flow rate and pressure. Flow rate is typically measured in gallons per minute (gpm) and represents the volume of fluid that the pump needs to move through the system. Pressure, on the other hand, is the force that the pump must generate to overcome the resistance within the system and push the fluid through the piping.
Pump output or water horsepower (WHP) is the liquid horsepower delivered by the pump. Pump Efficiency is the ratio of BHP and WHP. Best Efficiency Point (BEP) is the capacity at maximum impeller diameter at which the efficiency is highest. Specific speed (Ns) is a non-dimensional
Centrifugal Pump Sizing Chart
One of the tools commonly used in the process of sizing a centrifugal pump is a sizing chart. This chart typically provides a range of pump sizes along with corresponding flow rates and pressure ratings. By referencing the centrifugal pump sizing chart, engineers and designers can quickly identify the pump sizes that are capable of meeting the specific requirements of the system.
Centrifugal Pump Coverage Chart
In addition to the sizing chart, a centrifugal pump coverage chart can be a valuable resource in the pump selection process. This chart outlines the performance characteristics of different pump sizes, including their efficiency levels and power requirements. By consulting the centrifugal pump coverage chart, engineers can ensure that the selected pump not only meets the flow and pressure requirements but also operates efficiently and cost-effectively.
Centrifugal Pump Impeller Size Chart
The impeller is a critical component of a centrifugal pump that is responsible for imparting energy to the fluid and creating the necessary flow and pressure. An impeller size chart provides information on the various impeller sizes available for a particular pump model. By selecting the appropriate impeller size based on the desired flow rate and pressure, engineers can optimize the performance of the centrifugal pump.
Centrifugal Pump Selection Chart
A centrifugal pump selection chart consolidates the key performance parameters of different pump sizes, making it easier for engineers to compare and evaluate various options. This chart typically includes data such as flow rates, pressure ratings, efficiency levels, and power requirements for each pump size. By using the centrifugal pump selection chart, engineers can make informed decisions when choosing the most suitable pump for their application.
Pump Sizing Step by Calculation
While sizing charts and selection charts provide valuable guidance, it is essential for engineers to understand the underlying calculations involved in pump sizing. The following steps outline a basic method for sizing a centrifugal pump:
1. Determine the required flow rate (Q) in gallons per minute (gpm) based on the system requirements.
2. Calculate the total dynamic head (TDH) of the system, which includes the static head (vertical distance the fluid needs to be lifted), friction losses in the piping, and any additional head losses.
3. Select a pump size that can deliver the required flow rate at the calculated TDH.
4. Verify that the selected pump meets the pressure requirements and efficiency considerations of the system.
How to Select Centrifugal Pump
When selecting a centrifugal pump, it is essential to consider several factors beyond just flow rate and pressure. Some additional considerations include:
- Fluid properties: The type of fluid being pumped, its viscosity, temperature, and corrosiveness can impact the pump selection.
- System design: The layout of the piping system, the presence of valves and fittings, and the overall system configuration can influence the pump sizing.
- NPSH requirements: The Net Positive Suction Head (NPSH) available at the pump inlet must meet the NPSH requirements of the pump to prevent cavitation.
- Operating conditions: The operating temperature, altitude, and ambient conditions can affect the pump performance and selection.
Pump Type Selection Chart
of rotodynamic pump is the centrifugal pump (Figure 1). The amount of liquid that passes …
The pump is pumping at 100 psi. At its BEP, the pump should be between 80-85% of its shutoff head. 100 psi is 83% of 120 psi. The pressure to head conversion is: Assuming the pump has a 8.5 in diameter impeller and is running at 3500 rpm: Head = (8.5) 2 x 4 = 288 ft (close!)
sizing a centrifugal pump|centrifugal pump charts