On the Non-engineering tab of the P&ID DIN tool palette are two pin-shaped symbols that you use to identify a segment break. In the KKS tagging standard, pins can identify a change in Unit Number or System Code.
A pin can either be open (no-fill) or closed (black fill):
- Open pins. Open pins mark the boundaries of a group with a common property. For example, between open pins, a pipe line has the same Unit Number. However, simply placing the pins on a line does not change the properties. You must manually change the properties of the lines beyond the open-pin boundary.
- Closed pins. Closed pins identifies a break in piping sub-systems or branches in a pipe line. For example, a Unit Number might change at this break. The insertion of the closed pin does not automatically change the Unit Number in this example; you must change it manually.
Pins act like segment breakers. When you insert a pin into a straight schematic line, the pin breaks the line into two segments. However, if you insert an open pin at the end of the line, it does not break the line.