Impeller Diameter Table

Based on the solve variant defined in the curve family table, the impeller diameter table will capture the impeller diameter, impeller width, speed, or propeller pitch angle for each curve. (To define slant trims, the solve variant must be set to impeller diameter, and the shroud and hub diameter values must be populated in their respective columns). Additionally, the table captures any applicable start flows, shutoff powers, BEP (Best Efficiency Point) conditions and motor rating information. Click on the titles below for details.

Note: Before entering any data make sure the units of measure are set correctly.

How do I populate the impeller diameter table?

1. In the navigational tree, open the Performance curves folder, curve family folder, and the curve number folder for which the impeller information is to be populated.

2. The data manager pane will display the Impeller Diameter Table.

   This curve family has a solve variant of "impeller diameter", therefore diameter values are expected.

   If the curve family's solve variant was "propeller pitch", degree values would be expected and indicated as such in the 1st column header.

    

3. Populate the table as appropriate. Click on the column names below to learn more.

For solve variant:

Impeller diameter:

• *Diameter (shroud side) Enter in the shroud side impeller diameter value. This field must be populated.

• Diameter (hub side) If appropriate, enter the hub side diameter value. This is normally populated to identify slant trims. If it is desired to display slant trims in the Selector, the "display shroud and hub diameter" enabled box must be checked in the general curve table for the curve number.

• Diameter label (Pricebook) If applicable, enter a diameter label in this field that is to be displayed when generating pricebook curves. Options for the diameter label display are found under the Impeller Label Display section for chart settings in User Preferences.

• Diameter label (Selector) If applicable (other than the impeller diameter), enter the diameter label in this field that is to be displayed in the Selector. Options for the diameter label display are found under the Impeller Label Display section for chart settings in User Preferences.

• Head diameter label (Pricebook) If applicable (other than the impeller diameter), enter a head diameter label in this field that is to be displayed when generating pricebook curves. Options for the diameter label display are found under the Impeller Label Display section for chart settings in User Preferences.

• Power diameter label (Pricebook) If applicable (other than the impeller diameter), enter a power diameter label in this field that is to be displayed when generating pricebook curves. Options for the diameter label display are found under the Impeller Label Display section for chart settings in User Preferences.

• NPSH diameter label (Pricebook) If applicable (other than the impeller diameter), enter a NPSH diameter label in this field that is to be displayed when generating pricebook curves. Options for the diameter label display are found under the Impeller Label Display section for chart settings in User Preferences.

• Head start flow If the head curve is to start at a value other than zero flow, enter the desired value in this field. The "enable start flow for head" field in the general curve table must be checked for this option to take affect. The SKB will show the portion of the curve below the start flow value in red. The Selector will display the portion as defined in the "Curve display below start flow" field of the general curve table.

• Efficiency start flow If the efficiency curve is to start at a value other than zero flow, enter the desired value in this field. The "enable start flow for efficiency" field in the general curve table must be checked for this option to take affect. The SKB will show the portion of the curve below the start flow value in red. The Selector will display the portion as defined in the "Curve display below start flow" field of the general curve table.

• NPSHr start flow If the NPSH curve is to start at a value other than zero flow, enter the desired value in this field. The "enable start flow for NPSHr" field in the general curve table must be checked for this option to take affect. The SKB will show the portion of the curve below the start flow value in red. The Selector will display the portion as defined in the "Curve display below start flow" field of the general curve table.

• Submergence start flow If the submergence curve is to start at a value other than zero flow, enter the desired value in this field. The "enable start flow for submergence" field in the general curve table must be checked for this option to take affect. The SKB will show the portion of the curve below the start flow value in red. The Selector will display the portion as defined in the "Curve display below start flow" field of the general curve table.

• Power start flow If the power curve is to start at a value other than zero flow, enter the desired value in this field. The "enable start flow for power" field in the general curve table must be checked for this option to take affect. The SKB will show the portion of the curve below the start flow value in red. The Selector will display the portion as defined in the "Curve display below start flow" field of the general curve table.

• Motor rating min Populate this field if it is desired to define motor ratings based on the impeller trim. This field captures the minimum motor rating, and the “Motor rating max” field captures the maximum rating. On the performance datasheet, the list of compatible motors will be restricted basis the minimum and maximum motor ratings defined.
  
  If the minimum and maximum motor rating values are the same, then the motor rating will be fixed to that value.
  
  For impellers which can be trimmed, the minimum and maximum motor ratings will apply to the specified trim and all intermediate trims less than the specified trim and greater than the next smaller catalog trim.
  
  Example:
  
  
  
  Important  : Avoid defining a fixed motor power (general curve table) and motor rating values (impeller diameter table) for the same curve. The Selector will return N/A for the recommended motor rating.

• Motor rating max Populate this field if it is desired to define motor ratings based on the impeller trim. This field captures the maximum motor rating and the “Motor rating min” field captures the minimum rating. On the performance datasheet, the list of compatible motors will be restricted basis the minimum and maximum motor ratings defined.
  
  If the minimum and maximum motor rating values are the same, then the motor rating will be fixed to that value.
  
  For impellers which can trimmed, the minimum and maximum motor ratings will apply to the specified trim and all intermediate trims less than the specified trim and greater than the next smaller catalog trim.
  
  Example:
  
  
  
  Important  : Avoid defining a fixed motor power (general curve table) and motor rating values (impeller diameter table) for the same curve. The Selector will return N/A for the recommended motor rating.

• **Shutoff power If applicable, enter the desired power value for shutoff. This value will override the calculated value, and must be enabled by checking the "Shutoff power enable?" field.
  Note: Enabling "new" shutoff powers will alter the power, and subsequently, the efficiency curve.

• **Shutoff power enabled? A check mark placed in this field will apply the shutoff value specified in the "shutoff power" field.

• ***BEP flow If applicable, enter a flow value for the best efficiency point in this field. This value will override the calculated value. The "BEP flow and eff. enabled?" field must be checked for this to take affect.

• ***BEP efficiency [%] If applicable, enter an efficiency for the best efficiency point in this field. This value will override the calculated value. The "BEP flow and eff. enabled?" field must be checked for this to take affect.

• ***BEP flow and eff. enabled? Place a check in this field to enable the BEP flow and efficiency values populated in their respective fields.

*Required fields

**Column is displayed if "efficiency" is chosen in the general curve table

***Column is displayed if "power" is chosen in the general curve table

Speed: Note: All fields are the same as above, except diameter (shroud side) and diameter (hub side) are replaced by speed.

• * Speed [rpm] Enter in the represented speed value for the impeller. This is generally used for engine drive variable speed pumps. This field must be populated.

Impeller width: Note: All fields are the same as above, except diameter (shroud side) and diameter (hub side) are replaced by impeller width.

• * Impeller width [rpm] Enter in the width (vane thickness) measurement of the impeller. This field must be populated.

For propellers: Note: All fields are the same as above, except diameter (shroud side) and diameter (hub side) are replaced by normal propeller pitch and propeller pitch.

• *Normal propeller pitch [deg.] Enter the physical pitch that corresponds to the impeller's "Normal" pitch.  This value is added to the actual pitch values for the purpose of performing affinity law interpolation between pitches. For example: a normal propeller pitch set to 30 degrees and populated propeller pitches of 5 and 2 degrees, the interpolation calculation will use 35 and 32 degrees respectfully.

• *Propeller pitch [deg.] Enter the pitch value in degress for the propeller.

* Required fields

4. Click  to save changes.