Use of Process Simulation in Detailed Design

Process Simulation softwares are used in detailed design to finalize or revise sizing based on inputs from vendors and supplier,

To review and finalize the unit operations required to get the desired product quality
To review and finalize the heating and cooling requirement to meet the process requirement
To review and finalize the power requirement to meet the process requirement

To review and finalize rates of by-products and treatment required for by-products
To review and finalize heat and material balance for different cases
To review and finalize inputs to various sizing calculations, if applicable, but not limited to
- Separators
- Pumps
- Compressors
- Heaters
- Coolers
- Heat Exchangers
- Control valves sizing
  - Flow Control valve
  - Level Control valve
  - Pressure control valve
  - Pressure reducing valve
  - Temperature control valve
  - Choke valve
- Relief valves
- Rupture discs
- Blowdown valve
- Reactors
- Furnace
- Vent/flare header
- Distillation columns
- Absorbers columns
- Stripping columns
- Condenser
- Reboiler
- Flash vessel
- Pipe sizing
- Pipeline sizing
- Flow elements and flowmeters sensors
- Pressure gauges and sensors
- Temperature gauges and sensors
- Level gauges and sensors
- Interface level gauges and sensors
To review and finalize Inputs to other system calculation , if applicable, but not limited to
- Pipeline
- Drain system
- Vent system
- Hot oil system
- Cooling water
- Fuel gas system
- Refrigerant system
- Instrument gas or Air system
Provide inputs to engineering disciplines such as Mechanical, piping, Instruments, Electricals, Pipeline, safety, etc

In some specialize cases; the dynamic process simulation is performed to optimize the system. Few examples are safety system optimization for process safety time, compressor system optimization for control system finalization and review requirement of hot gas bypass, etc.
Finalize the design basis, operating philosophies and other documents as necessary