Variable Length Tube (and Rod) Attributes

Keywords

LSTUBE LSROD HSTUBE HSROD

Description

Straight lengths of Tube (ducting, trays and rod) between Components are not defined as elements in the hierarchy. Instead, they are extruded from the Leave p-point of a Component to the Arrive p-point of the next. Their geometric cross-section details are stored in the Catalog and are pointed at from the Upstream Component via its LSTU attribute. At the Head of a Branch, there is no Upstream Component; therefore a special Branch attribute exists to allow Tube from the Head to the first Component to be specified (HSTU).

Generally, the user need not be concerned about specifying Tube between Components, as it is automatically determined during the Component Selection process described elsewhere. If short fixed-length stubs of Tube are required, it is usually appropriate to create a Component FTUB element to make sure that this minimum length is adhered to. Similarly, where Tube changes direction, a Component must be inserted (usually a BEND), as variable length Tube is always straight.

Note:
These attributes are usually set automatically when the CHOOSE (or SELECT) command is used.

Command Syntax

>--+-- LSTube --.
   |            |
   |-- HSTube --|
   |            |
   |-- LSRod ---|
   |            |
   ‘-- HSRod ---+-- name ----.
                |            |
                ‘-- NULREF --+-->