Diagrams User Guide
Diagrams : Piping & Instrumentation Diagrams (P&IDs) : Instrumentation : Elements
Elements
Schematic Loop (SCLOOP)
The Schematic Instrumentation LOOP is located at the same level as SCPLIN, which will be a root for a secondary hierarchy. Instruments and other piping components will have the capability to reference a SCLOOP and participate in the SCLOOP hierarchy (very similar to the SYSTEM hierarchy, but the SCLOOP will be in the schematic database).
If a high level of detail is desired, it will be possible to model instrument lines in the same way as the main flow, using branches, tubes, valves and off-page connectors. All discrete components as well as structural elements will have the capacity to refer to a SCLOOP by SCLORE attribute, and thus, be a member in instrument loop hierarchies.
Figure 5:10.
SCLOOP element in the tree explorer
All elements that are members of a schematic loop can be easily found and selected on the drawing. You can use one of the options from the context menu, Select in Drawing, Highlight or Zoom to. A typical loop is presented below:
Figure 5:11.
Typical instrument loop
The Offline instrument (CCH-0/TC) is controlling the temperature inside the reactor. If the temperature is too high/low, it gives a pneumatic signal via the tube to the actuator. The actuator is steering cooling stream via a valve.
To create a new schematic loop the following dialogue is to be used:
Figure 5:12.
Instrument Loop (SCLOOP)
An existing Instrument Loop can be modified by the Instrument Loop Properties dialog. It is available in the context menu after right-clicking the Instrument Loop element in the Schematic Explorer.
Figure 5:13.
Instrument Loop Properties
SCILIN represents a Schematic Instrument Line in the data model. It is very similar to SCPLIN and should be used by those who prefer to have a high level of detail in their instrumentation model. SCILIN is able to refer to SCLOOP via the SCLORE attribute, similar to other instrumentation elements. SCILIN has the same member hierarchy as SCPLIN (SCBRAN, SCSEG etc.) and its primary hierarchy structure is the same as for SCPLIN.
From the Home Tab > P&ID > Instrument menu an Instrument Line can be created as shown below:
The options here are the same as for pipeline. There is one additional option that allows to set schematic loop references for Instrument Lines.
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