Lesson 1, Topic 1
In Progress
Piping and Instrument Diagram(P&ID)
- P&ID – Construction Guide/Manual
- P&ID is also known as mechanical flow diagram (MFD)
- Contains: plant construction information (piping, process, instrumentation, and other diagrams)
- Provides information needed by engineers to begin planning for the construction of the plant
- Look at V-102 on P&ID
- V-102 contains an LE (Level Element)
- LE senses liquid level in separator and adjusts flow rate leaving
- LE opens and closes a valve depending on liquid level
- LE and valve represent a feedback control loop
- V-102 contains an LE (Level Element)
// P&ID Summary
- The final control element in nearly all chemical process control loops is a valve.
- Key to understanding the control logic is to identify which flowrate is being manipulated to control which variable.
- Based on the P&ID diagram:
- Mech and Civil Engrs will design and install pieces of equipment.
- Instrument Engrs will specify, install and check control systems.
- Piping Engrs will develop plant layout and elevation drawings.
- Project Engrs will develop plant and construction schedules. v
- Before final acceptance, P&IDs serve as a checklist against which each item in the plant is checked.
- Design Case Vs Base Case
// How to Read P&ID