2 replies to this topic

[Santhosh Kumar_205746]

HI EVERYBODY,

CAN ANYBODY SHARE THE WORK PROFILE OF A PROCESS ENGINEER AT A PETROLEUM REFINERY IN PROJECT PHASE.

THANKS IN ADVANCE

[Profe]

Hi Santhosh Kumar.

Next, I think that the following text clarify your spectations about Process Engineer.

Process Engineering
Process Engineering can also be called Chemical Engineering since it utilizes the basic chemical engineering fundamentals of:

• Equilibrium
• Thermodynamics
• Mass and energy transfer
• Material balance and energy balance
• Economic balance

The process engineer utilizes Equilibrium to determine the vapor-liquid phase distribution in the various parts of a plant. He uses Thermodynamics for determining the availability of and predicting the energy and other properties of the substances he is processing, usually with a minimum amount of experimental data. He makes use of Mass and Energy Transfer extensively in his calculations of the many unit operations he performs. The Mass and Energy Balance principles are then used to develop the process specifications covering the overall plant design. The Economic Balance is utilized many times during and after completion of the design to determine the feasibility of operations, for evaluation of the design of heat exchangers and for energy recovery and the degree of distillation requirements.
One additional fundamental should be the “Judgment Balance”, since none of the other engineering disciplines make so much use of empiricism and trial and error methods. Many of process calculations are not completely rigorous, such as fractionator sizing, and judgment must be applied to the final answer.
Process engineering also makes use of most of the standard chemical engineering Unit Operations such as:

• Fluid flow
• Heat transfer
• Distillation
• Evaporation
• Absorption and Adsorption
• Extraction
• Drying
• Filtration

The process design engineer deals also with most of the Chemical Processes which involves many forms of chemical reaction, including:

• Oxidation
• Reduction,
• Combustion
• Hydrogenation and Dehydrogenation
• Isomerization, Alkylation and Dealkylation
• Hydrolysis, etc.

The various phases or steps in the process engineering design of a plant are as follows:

• Establish the design basis
• Develop schematic flow diagram
• Develop mass balance
• Use V/L equilibrium for phase conditions
• Make recycle calculations
• Make fractionation equilibrium
• Develop energy balance
• Determine fractionator, and extractor internal loadings and the size of the vessels.
• Develop a comprehensive process flow diagram and controls.
• Issue the process design to project engineering.

The process engineering phase of a project takes about 5 to 10 percent of the man hours required to produce the complete project specifications for a plant. This small percentage of engineering man hours expended in producing the process design will have a much greater effect on the economics and operability of the plant than any other phase of the design. The process design will affect the number of pieces of equipment used, the size and arrangement of the equipment, the materials of construction and the degree of instrumentation and control; all of which bear substantially on the cost and operability of the plant.
The process engineer works with the Development engineers in the early phase of his work and then he works closely with the Project Engineers after his specifications are completed in order to develop the complete Project Specification of the plant.

Some tips to consider
Engineering: Is the art and science by which the properties of matter and sources of power in nature are useful to man. The art is a skill, acquired by performance and experience, of knowing when to apply science and when to use empiricism to the tasks at hand.

Basic Fundamentals of Design

• Calculable
  
  • Material balance
  • Energy balance
  • Heat and mass transfer
  • Equilibrium
• Variable
  
  • Economic
  • Operational
  • Safety
  • Environmental
• Judgment

Design Steps

• Process Concerns
  
  • Establish basis of design
  • Develop schematic flow
  • Develop mass balance
  • Calculate vapor/liquid (V/L) phase conditions
  • Calculate mass transfer devices
  • Develop energy balance
  • Calculate vessel V/L loadings
  • Develop process flow diagram
• Equipment Definition Concerns
  
  • Establish unit hydraulics
  • Establish metallurgy
  • Define mechanical equipment
    
  • Heat exchangers
  • Rotating equipment
  • Vessels/piping
  • Instruments
• Construct piping and instrument diagram (P&ID)
• Reference use of standard specifications & drawings
• Prepare cost estimate

The Typical Design Package Contents:

• Basic Engineering Design Data
• Process Information
  
  • Mol balance
  • Heat and weight balance
  • Process flow diagram
  • General equipment summaries
• Project Specifications
  
  • Specific equipment specifications
  • Metallurgy for equipment and piping
  • P&I diagram
  • Standard specifications and drawings

Resources for Hydrocarbon Properties and Behavior

• API Technical Data Book, ASTM, ASME, NACE, Standard of Engineering.
• Bibliography and technical publications like specialized Textbooks on “Fluid mechanics” Victor L. Streeter, “Heat transfer” Donald Q. Kern, Chemical reaction O. Levenspiel, Oil Refining, Hydrocarbon Processing Magazine, Chemical Engineering Magazine, etc.
• NGPA Data Book.
• Perry’s Chemical Engineer’s Handbook, etc.

Computer Software

• Process Simulation packages. (Use, application and understanding the underlying theoretical aspects of simulation calculations)
• Engineering Calculations
  
  • Excel Spreadsheets (advanced and VBA programming will be better)
• Dynamic Simulation (assessment)
• Engineering Database (use)

For the process design you need define:

• Feed
  
  • Quantity
  • Properties
• Products
  
  • Distribution
  • Yields
  • Properties
• Utilities (Quantity & Properties)
  
  • Steam
  • Water
  • Fuel
  • Power
• Bases/Goals for the project
  
  • Economic
  • Operational
  • Environmental
  • Standards/Codes
  • Equipment details
  • Safety

Finally, a great desire to learn and increase your knowledge continuously, which never ends if you want to be a good Process Engineer.

I Hope this will be useful for your profesiona life.

Edited by Profe, 02 October 2012 - 11:52 AM.

[Santhosh Kumar_205746]

<sub>Thank you very much sir, for your detailed explanation.

Surely it will be helpful for me.</sub>