when talking of pipingcomponents, properties like “nominal size”, “pressure class”, “pipe schedule” are often discussed. My understanding the nominal size in ifc is covered by Pset_PipeSegmentTypeCommon, and I see PressureRating on Pset_BoilerTypeCommon
our product managers claim the NominalSize is not a unit, but more of an enum or a string. my own investigation led to believe the nominalsize is always one of the pre-defined values according to ASME B36.10 or other standards.
was it something we overlooked, or was it a conscious decision to use a unit here and then why?
additionally, do we know if users ever use IfcClassificationReference to model PressureClass or PipeSize? PipeSchedule?
how is the pipe schedule modeled in IFC?