Pump Selection from Catalogs
by Engineered Software, Inc.
The following article pertains to PIPE-FLO® Professional Version 12 and above.
Manufacturer's Electronic Pump Curve
The manufacturer's electronic pump curve includes a wealth of information about a selected pump. The list of supported manufacturer catalogs can be viewed at http://www.eng-software.com/pml/.
With the system calculated, you can select a curve from a catalog by selected either the sizing or centrifugal pump device, right clicking the mouse and choosing "Select Catalog Pump" from the context menu to open the Pump Selection dialog. If the system is not calculated, you will not be able to use the search feature, but you can see all the pumps available in the catalog and choose one.
From this dialog box, you choose the pump catalog you want to search by opening the elevator button for Select Catalog. Each pump catalog has to be individually downloaded from the Engineered Software website link listed above.
Once the pump catalog is selected, choose the Types and Speeds of the pump you would like to search for.
The software will then populate the dialog box with pumps that match the flow rate and head from the calculated results of the model. By choosing Edit Search Criteria, the search criteria can be modified and other criteria added. The pumps can be sorted by clicking on any of the column headers, in this case, efficiency. Double clicking on a pump will open the detailed graph.
When a suitable pump is found, in this case the 5x3-8.25, select it add it to model by choosing the button.
Once a manufacturers curve is inserted in the piping system model, the range of pump impellers, allowable operating range, minimum flow, notes, and limits are available. PIPE-FLO will notify the user via Messages when any of the manufacturers imposed limits on their products are exceeded when the model is calculated.
Advantages and Disadvantages
Manual Curve: The Manual pump graph displays the minimal information showing the pump speed, head and flow. NPSHr, efficiency, and power can also be entered by the user for inclusion on the graph as well as associated warnings and calculations. The more data points that are entered, the more accurately the curve will match the source material.
Manufactures Electronic Curve: The electronic curve gets the pump performance data from a manufacturers' catalog. It is important to stress that this information is created, reviewed, and approved by the manufacturers of the pump. As a result this information is accurate and kept current. In addition, since the performance data is professionally digitized, there is more information available in the curve, such as iso-efficiency lines and selection windows.
Pump Graph Windows
A pump graph can be accessed anytime by selecting a pump, right clicking the mouse, and choosing "Graph" from the context menu. The pump graph window displays the pumps minimum flow rate as a red lines of the left of the curve, along with the preferred operating range as dark diagonal black lines in the curve. The red knee mark indicates the operating point for the pump. The pump graph window also displays the pump speed, impeller diameter, flow rate, head, NPSHr, efficiency and power. As you can see below, the catalog curve is more graphically rich in information.
The pump's speed and impeller diameters can be manual adjusted by scrolling up or down on the corresponding elevator buttons. This will adjust pump performance in accordance with the Affinity Rules.