P&ID Flashcards
Description of the nature of the process
Process flow sheet
Other terms for P&ID
Engineering Flow Sheet
Engineering Line Diagram
Who does the design and piping system specification of process instrumentation & control system
Specialist design groups
Identified by equipment no.
Drawn roughly in proportion
Location of nozzles are shown
Process equipment
Identified by line numbers
Pipes
Line number should have
Pipe size and material of construction
Two types of valves
Control
Block
Valves are identified through ID no containing
Type ( symbol or code)
Size
3 ancillary fittings
Inline sight glass
Strainer
Steam traps
In this process the utility or service lines are shown in P&ID
Simple process
T/F: In complex process the service connection to each unit operation must be shown in P&ID
T
Resembles process for sheet without process information
P&ID
T/F: In P&ID, same equipment no. Should be used
T
In P&ID, these were more detailed than those used for Process flow sheet
Equipment symbols
T/F: There exists an ISO or European Standard for P&ID symbols
F
Most used international standard symbols for instruments, controllers and valves
Instrumentation Systems & Automation Society Design Code
T/F:When laying out a P&ID, show relative elevation of the process connections
T
Examples of Relative elevation of the process connections
NPSH of Pumps
Barometric legs
Thermosyphon Reboilers
Full details of pipe layout are shown in?
Piping isometric drawing
Where does the P&ID prepared
CAD
Modern control valves has final control elements and are actuated by
Electric motors
Older control valves are actuated by___ using ____
Pneumatic Signals
Instrument air
Device that makes something move/operate
Actuator
Receives a source of energy to move something
Actuator
Used when electronic controllers might cause process hazard and when electric power is not available/reliable
Pneumatic
Inclusions of P&ID
Process equipment
Pipes
Valves
Ancillary Fittings
Pumps
Control Loops and Instruments
Different standards followed by some contries
BS 1646 in UK
DIN 19227 & DIN 2429 in Germany
Actuator for larger valves
Motor actuator
For valves that opens and closes which is commonly present in batch processing
Digital & Solenoid
Drawn to a manner distinguishable from process lines
Instrument connecting lines
T/F: Process line are thinner than instrument connecting lines
F
Direction of the arrow shows the position of the valve on failure of the power supply
Failure mode
Controller & display is located out on the plant near the sensing instrument location
Locally Mounted
Located in the control room
Main panel
T/F most controllers are mounted in control rooms except small plants
T
A system that is functionally Integrated, but consisting of subsystems that may be physically separate and remotely located from one another
Distributed control system
Is an operator interface device that is used to display process control information from a number of sources at the command of the operator
Shared display
Examples of operator interface device
Computer screen
Video screen
T/F: Most plants built since 1990 use instrument panels instead of shared display
F, the other way around
Used to control discrete operation such as steps in a batch or semi continuous process and to program interlock controls that guard against unsafe or uneconomic conditions
Programmable logic controllers
Indicated on the circle represents ____ by a letter code
Instrument- controller
Indicates property measured
First letter
Indicates the function
Subsequent letters
is used for final control elements when this is not a valve
Z
