These drawings are very helpful as they convey the correct amount of process information as needed during various stages of bidding, engineering design, procurement, construction, operation and process start-up phases .

Both schemes are used in chemical or process engineering and although they share the same designations there is a simple difference between a piping and instrumentation diagram and a fluid process diagram.

The first is a comprehensive installation diagram showing the interconnection of pipes, valves and instrumentation involved in a physical process. While the second does the same, but in a more synthetic or panoramic way , let’s say it is like the installation draft.

Typically, process flow diagrams (PFDs) for a single unit will include process piping, major equipment items, control valves and other major valves, connections with other systems, main bypass and recirculation streams, operating data (temperature, pressure, mass flow, density). , etc.)

On the other hand, the P&ID are vital for a correct maintenance and modification of a process, include both major and minor details of the Chemical process. They show all major equipment, piping details such as service, size, specifications, classification, insulation, etc., instrumentation details such as pressure, temperature and flow instruments, control valves, pressure relief valves, gauges, routing information like slope, patter, free flow.

Ultimately, we will find more elements and determining data in a DTI

• Classification or capacity of the team
• Instrument root valves
• Manual switches and indicator lights
• Tubes and valves of primary instruments
• Pressure, temperature and flow data
• Elbows and similar standard accessories
• Control relays
• Extensive explanatory notes