Creating loop diagram using std templates

[Vilas Desai]

Friends
I am trying to automate the process of making Loop diagrams using Excel or Java based on the instruments found in a P&I Diagram. I am making a standard template and copying the loop details in the template based on the details of the instrument as i see in a P&I Diagram.
I am confused on
1. how to make a loop diagram for multiple instruments in the same line , for ex PT, LT, PIC, and AT
2. how does the loop diagram look like if I have an indicator and controller in the same instrument.
3. How do I represent a control valve with controls for actuator and positioner in the same loop diagram.

Thanks in advance
Vilas D

 

[danw2]

scroll down until you find several examples of loop diagrams near the bottom.
Link

There's also the ISA Standard, ISA-5.4-1991 Formerly ANSI/ISA-5.4-1991