Model Reference Manual
Piping, Ducting and Cable Trays : Defining a Branch
Defining a Branch
Before routing takes place, various preparatory steps are taken to define the Specification and the start and end points of the Branch or Hanger. The Piping Specification and Insulation Specification are defined first, so that all Components created within the Branch can be selected correctly.
The Head and Tail attributes can be set either by explicit positioning or by connection to another item (e.g. a Nozzle). The Tail position may be in free space, when it is determined by the Leave point of the final Component in the Branch. It is quite normal in such circumstances to route the pipe with only the HEAD attributes set up. (The reverse may also apply if routing backwards.)
When a Branch is connected to another item, the attributes of the element that it is connected to are set to refer to the Branch. For example, if a Branch Head is connected to a Nozzle, then the CREF (Connection Reference) attribute of the Nozzle is set to refer to the Branch.
Note that when a Branch is connected to a Nozzle, the Nozzle may be part of a database to which the piping engineer does not have write-access. In this case, an Inter-DB Connection Macro is created, which can be run by the designer who does have write access to the second database. This macro is a sequence of commands that, for example, sets the CREF of a Nozzle that has been connected to by the piping designer. Refer to Inter-DB Connection Macros for further information.
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