For the planning of pipings in the P&I diagram, you can use the new connection symbol "Junction". A junction has three connection points, of which two pass through the connection, while the third is the place where the connection ends. When you place such a symbol on an autoconnecting line in the P&I diagram, a new pipe segment is created from such junction, rather than a complete second connection, as would be the case in electrical engineering.
Generated connections
The following figure shows the situation when three functions / devices A, B, C are connected to each other via a connection symbol D through autoconnecting lines.
By using a junction as connection symbol D, the following connections are generated in the P&I diagram:
|
Source |
Target |
|---|---|
|
A |
B |
|
C |
LN 100 |
Insert junctions
To insert a junction, select the following commands: Tab Insert > Command group Symbols > 
(Junction). (With the button 
(More) you can expand the field with the symbols and select the button for the junction below the Line connector field.) The junction symbol hangs on the cursor and can be placed on the page. You can select a different variant in the property dialog then opened.
The actual junction from a straight or angular connection is identified in the symbol by way of an arrow. This arrow for identifying the junction is located on the EPLAN555 layer for connection symbols. The default settings for this layer have been chosen in layer management such that the arrow is not visible in the graphical editor and while printing. To show invisible elements, such as this arrow, on a page again, press the [U] key.
The hidden layers are always visible when inserting the symbol and in the property dialog for junctions, and the displayed arrow allows you to select the correct variant.
Example:An example of a junction is the following variant A of the symbol TPIDL:
The straight-line connection is passed through between the connection points 1 and 2. The arrow on connection point 3 identifies the junction.
Tips:
- For junctions, the SPECIAL symbol library contains the two new symbols TPIDA (junction at angular connection) and TPIDL (junction at straight-line connection). If, after selecting the button (Junction), you press the [Back] button, the symbol selection opens, and you can select one of these two special symbols.
- If the substance flowing through the piping at a junction and also the further piping data are not to be transferred, activate the Separate substance at junction setting in the property dialog of the respective junction.
See also