The Root Gap Rule node (the Rootgap sheet in the Sample Data Piping Specification.xls workbook) is an optional rule that defines the root gap to apply to the weld between the header pipe and an olet-type branch, or between an elbow and an elbolet. You can define exceptions for a particular piping materials class in the Root Gap Per Spec.

Nominal Piping Diameter From (Optional)

Define the lower bound of the header's largest nominal piping diameter for which this root gap applies.

Nominal Piping Diameter To (Optional)

Define the upper bound of the header's largest nominal piping diameter for which this root gap applies.

Nominal Piping Diameter Units (Optional)

Specify the units for the Nominal Piping Diameter From and Nominal Piping Diameter To columns. For example, type in for inches or mm for millimeters.

Root Gap (Required)

Specify the root gap to use for the nominal piping diameter range. Be sure to include the units of measure when specifying this value.