# Auto-Sizing PD Pumps

From v3.31 onwards, FluidFlow includes a powerful Auto-Size feature which allows engineers to automatically size a range of elements including PD Pumps. This series of examples demonstrates how these pumps can be automatically sized. To begin, a Burton Corblin Diaphragm PD pump has been modeled in a 2 inch Schedule 40 steel pipeline with a total length of 18.28 M. Using the calculated information, we can benchmark our automatically sized element against this base model. Figure 1 shows the data entry for the PD pump and Figure 2 gives an overview of the performance of this device in this system. Figure 1: Data entry for the Diaphragm PD Pump (Auto Size function set to Off). Figure 2: Diaphragm PD Pump Model (Auto Size function set to Off). From this analysis, we have established the pump operating performance. The flow rate and duty pressure rise has been calculated as 0.5208 kg/s and (388 Pa) respectively and a NPSHa of 10.1 m fluid has been established. Auto-Sizing PD Pumps. Set the Automatically Size field for the pump to "On" and enter a Design Flow rate of 0.5208 kg/s. Note, the field titled Pump Model has now been removed from the Input Editor. The Input Editor for the pump should now appear as shown in Figure 3. Figure 3: Data entry for Auto-Sizing a PD Pump. Figure 4 shows the calculated results for the pump. As we can see, FluidFlow has established a duty pressure rise of 388 Pa and a NPSHa of 10.1 m fluid, i.e., exactly matching the results from Figure 2. This element has therefore been automatically sized successfully. Using this data, we can now select a suitable pump model from the database (Burton Corblin Diaphragm PD Pump) or request a proposal from a vendor. Figure 4: Auto-Sizing a PD Pump. For further information, a detailed example of automatically sizing components is available at: Design Examples | Auto Equipment Sizing.