Maire Tecnimont Process Engineer Interview Questions, Process, and Tips

Q1. What is the criteria for line sizing?
Ans. 
Line sizing criteria is based on factors like flow rate, pressure drop, fluid properties, and velocity.
• Consider the maximum flow rate the line needs to handle

• Calculate the pressure drop allowed for the system

• Take into account the properties of the fluid being transported

• Ensure the velocity of the fluid is within acceptable limits

• Use industry standards and guidelines for sizing criteria

• Example: For a water distribution ...read more
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Q2. What is NPSH in pump calculations?
Ans. 
NPSH stands for Net Positive Suction Head and is a critical parameter in pump calculations.
• NPSH is the measurement of the amount of suction head required by a pump to prevent cavitation.

• It is calculated by subtracting the vapor pressure of the liquid from the total suction head of the pump.

• NPSH is important to ensure the pump operates efficiently and does not experience cavitation which can damage the pump.

• Low NPSH val...read more
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Q3. How to calculate suction pressure in pump?
Ans. 
Suction pressure in a pump can be calculated by adding the atmospheric pressure to the gauge pressure.
• Calculate gauge pressure by subtracting the pressure at the pump outlet from the pressure at the pump inlet.

• Add the atmospheric pressure to the gauge pressure to get the suction pressure.

• Suction Pressure = Atmospheric Pressure + Gauge Pressure

• Example: Atmospheric pressure = 14.7 psi, Gauge pressure = 5 psi, Suction pre
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Q4. What to do if NPSH is negative.
Ans. 
If NPSH is negative, increase the suction pressure or decrease the fluid temperature to prevent cavitation.
• Increase the suction pressure by using a booster pump or increasing the tank level

• Decrease the fluid temperature to increase the vapor pressure margin

• Check for any restrictions or blockages in the suction line

• Ensure the pump is properly sized for the application
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Q5. Why line size of pump suction is bigger than pump diacharge?
Ans. 
The line size of pump suction is bigger than pump discharge to reduce friction losses and increase efficiency.
• Bigger suction line reduces friction losses and allows for easier flow of fluid into the pump

• Smaller discharge line increases pressure and helps in maintaining flow rate

• This design helps in optimizing pump performance and efficiency
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Q1. Process of line sizing, Pump hydraulic calculation
Ans. 
Line sizing involves determining the appropriate diameter of pipes for a given flow rate, while pump hydraulic calculation involves calculating the pump head and power requirements.
• Determine the required flow rate for the process

• Calculate the pressure drop along the pipeline

• Select the appropriate pipe material and schedule based on process conditions

• Use hydraulic calculation formulas to determine pump head and power re...read more
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Q1. Overview of past experience
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Q2. Problem on Pump hydraulics
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Q3. Control valve hydraulics
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Q4. Problem on material balance
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Q5. Problem on energy balance
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Q6. Questions on points mentioned in resume
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Basic questions related to chemical engineering such as what is the formula of range in cooling tower, pump hydraulics, line sizing.

Read the current affairs from news paper even though these part of interview is not that significant.

Q1. How to do pump hydraulics
Ans. 
Pump hydraulics involves understanding the flow rate, pressure, and head of the fluid being pumped.
• Determine the flow rate of the fluid being pumped

• Calculate the pressure required to move the fluid through the system

• Determine the head required to overcome any elevation changes in the system

• Select a pump that can meet the flow rate, pressure, and head requirements

• Ensure the pump is properly sized and installed for optim
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