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Документация по программе Microsfot Visio (или EB = Engineering Base)

Pipelines and Segments as new Covers

Pipelines and pipeline segments are structural elements rather than devices.
Therefore, individual cover IDs have been allocated to these EB object types as of EB 2019.
The behavior of the objects pipeline and pipeline segment is identical to the previous behavior of the devices.
Pipeline
CID 381, TID 2150
Pipeline Segment
CID 382, TID 2200
Pipes and segments created before EB 2019 will automatically be converted to the new CIDs.
Existing shapes will also be converted and checked for the correct number of pins.
In the symbol design, it must be ensured that symbols to be used as pipeline or segment separators have exactly two pins.
Symbols for pipeline or segment separators must be created in the provided stencils.
In this context, the symbol design ensures that the symbols meet the necessary minimum requirements.
Only symbols of these stencils will be identified as pipeline separators resp. segment separators.

Вряд ли Covers - крышки в этом контексте. Здесь другой смысл...Как это правильно назвать ?

Вот в другом месте этого документа:

Context.
The extensions include universally usable (license-independent) features:
the possibility to also enter certain fractions on entering values for attributes with units,
comfortable entry of units for unit attributes,
user-related mapping of unit groups to text attributes
the new Explorer view "Attributes List",
the freely dockable attributes list in Visio,
the extended type list to filter object types in the Explorer and Visio trees,
an extended type selection on creating new equipment,
a simplified navigation to associated objects,
projects with specification catalogs and pipe class catalogs.
history tracking on the objects level
multi cover worksheets