This is an example of the graphic representation of equipment in an elevation drawing.
Every piece of equipment is labeled with a name label and a north-east coordinate label. The name label is placed in the center of the equipment, unless there is an object already in the center, or if there is not sufficient white space for the label. If the label cannot be placed on the center of the object, it is placed with a jogged leader. The coordinate label is placed on the object origin, unless there is insufficient space, in which case it will find the necessary white space. See the above graphic for an example of the labels.
Horizontal dimensions are placed on each equipment object. The point of dimensioning is the object origin. Nearby columns are also dimensioned with the equipment objects.