Quiz 3 Flashcards
Mod 3 Chapter 7
Describe P&ID
- most instruments will be included
- instrumentation interconnections
- more detail than pfd, less than loop
Describe loop diagram
- most information
- can have input output calibration information
- information on install and troubleshoot of a loop
- has all of the symbols
- instrument action
Describe PFD
- major interconnections
- major components
- no instrument interconnections
- earliest drawings in starting a new engineering project
Describe functional diagram
- strategy of a control system
- flow of information
What is a cascade control system?
A control system where the output of one controller acts as the SP for another.
In a functional diagram, what does a dashed and solid line mean?
- Dashed = discrete signal
- Solid = analog signal
What is the difference when drawing field bus line and a data link line?
- Data link has circles
- Field bus has diamonds
pg388
How would you describe a shared instrument on the back of an auxiliary panel symbol bubble?
Circle with a square around it
2 dashed lines through the center
pg389
Describe an open vs closed valve symbol.
Open is a white bow tie
Closed is a black bow tie
pg390
What does FL/DC represent?
Fail last/drift closed
valve failure position
What part of the ISA has the symbol standards?
5.1
What does the ID tag for an instrument describe?
Its function and which loop it belongs too.
What do the first and second letter mean in the instrument tag?
first - variable it is sensing or controlling
second - modifier
A diagram the shows major interconnections and instrument interconnections as well as most of the instruments is what?
P&ID
If you free handed a sketch for you boss what kind of drawing would that be?
Sketch
