Piping Components and ATTAs

A reference dimension is set up by setting the DMTYPE and DMFARRAY attributes of the piping component or ATTA.

Support ATTAs and dimensioned or non-dimensioned Comment ATTAs can be used to create reference dimensions for points on tube. Split ATTAs and Flow ATTAs cannot be used.

DMTYPE is a word array attribute. It defines which component of the reference dimension is plotted. It can be set to one or two of the following:

• EAST

• NORT

• ELEV or

• POS for a 3D dimension

The Example Plot file image in the SKEY Attributes shows one reference dimension to a piping component with POS specified, and one reference dimension to a Datum, with ELEV specified.

DMFARRAY is a reference array attribute. It is used to set the names of the reference elements.

For example:

DMTY NORT EAST

DMFA /N.WALL /VESS2

produces two reference dimensions, one giving the distance North to the centreline of the element named /N.WALL and one giving the distance East to the centreline of the Equipment named /VESS2.

DMTY ELEV

DMFA /SITE.BASE

produces a reference dimension to the centreline of the element /SITE BASE.

The dimension will be to the centreline of the Reference element.