This field captures the required head rate for the application; it is a required field (bold text). The image below is an example of the Head, rated on the Basic Operating Conditions twistie on the Operating Conditions tab of the Conditions of Service Page.
Clicking on the Differential head/pressure, rated hyperlink will take you to the Head Loss Module page.
This is the customer's required head (TDH) and is a required field (highlighted in bold). In addition to sizing the pump, this value is also used to filter the products on the Product Lines page such that if the overall head limit of a product line is exceeded, the product line will not be displayed. Changing the unit drop-down will not change any entered value. Changing units by using the Units button will convert any entered value.
As above this represents the required head specified by the user. In addition, within the Product Line Options section the user may be able to specify where the head is measured at: discharge nozzle centerline, mounting surface, low liquid level, bowl, or pump.
The Selector will make all vertical pump selections using the bowl head. The bowl head is calculated as described in the table below. A "Yes" indicates that the value is included when calculating the bowl
For example:
