During isometrics generation in OpenPlant Isometrics Manager, below steps provides information on dimensioning valve along with gasket.
While generating Isometrics, user requirement is to dimension the fittings and components in various ways based on project expectation. Below are few options described to dimension components along with gaskets. This can be realized in using both OpenPlant modeler and AutoPLANT modeler. Below discussions shown in context with OpenPlant Modeler. See image below with default dimension representation.
With earlier version of Openplant isometrics manager, user need to modify the dimension manually. User could manually edit the dimension by double clicking and shift the terminator using handler. As shown in image below.
http://communities.bentley.com/products/plant/design___engineering/w/plant_design_and_engineering__wiki/12639.modifying-dimension-styles
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