L&T Energy Hydrocarbon Interview Questions, Process, and Tips

Q1. What you have done in piping
Ans. 
I have designed and implemented piping systems for various industrial projects.
• Designed piping layouts for new construction projects

• Analyzed existing piping systems for efficiency and made recommendations for improvements

• Collaborated with other engineers and contractors to ensure proper installation and functionality

• Performed stress analysis on piping systems to ensure safety and reliability
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Q2. How many tipes of drawings
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There are various types of drawings used in engineering, including mechanical drawings, architectural drawings, electrical drawings, and civil drawings.
• Mechanical drawings: used to illustrate mechanical components and systems

• Architectural drawings: used to show the layout and design of buildings

• Electrical drawings: used to depict electrical systems and wiring

• Civil drawings: used for infrastructure projects like roads a
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Q3. What is a role of LPD and HPV, why installation in line
Ans. 
LPD and HPV play a crucial role in controlling pressure and flow in pipelines, ensuring efficient operation and preventing damage.
• LPD (Low Pressure Drop) valves help reduce pressure loss in pipelines, improving efficiency and reducing energy consumption

• HPV (High Pressure Valve) valves are used to control high pressure flow in pipelines, preventing damage and ensuring safety

• Installation in line ensures that LPD and HPV ...read more
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Q4. How to decide test in piping
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Tests in piping are decided based on factors like material, pressure, temperature, and intended use.
• Consider the material of the piping (e.g. steel, PVC) to determine appropriate tests.

• Take into account the pressure and temperature the piping will be subjected to.

• Identify the intended use of the piping (e.g. water supply, gas distribution) to select relevant tests.

• Common tests include hydrostatic testing, pneumatic tes
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Q5. How many gauge are provide during hydro
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Typically, multiple gauges are provided during hydro testing to monitor pressure and ensure safety.
• Multiple gauges are provided during hydro testing to monitor pressure at different points.

• Common gauges used include pressure gauges, temperature gauges, and flow meters.

• The number of gauges provided can vary depending on the size and complexity of the system being tested.

• For example, a hydro test on a large industrial pi...read more
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Q6. Why are dropping pressure at highest point guage during hydro
Ans. 
The dropping pressure at the highest point gauge during hydro testing is due to the natural phenomenon of hydrostatic head pressure.
• Hydrostatic head pressure decreases as the height of the fluid column decreases.

• The pressure at the highest point gauge will be lower compared to the pressure at the bottom of the system.

• This drop in pressure is expected and is a normal occurrence during hydro testing.

• Factors such as eleva...read more
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Q7. Difference between SS304 and SS316
Ans. 
SS304 is a basic stainless steel alloy with 18% chromium and 8% nickel, while SS316 has 16% chromium, 10% nickel, and 2% molybdenum.
• SS304 is more commonly used for general applications due to its lower cost and good corrosion resistance.

• SS316 is preferred for applications where higher corrosion resistance is required, such as in marine environments or chemical processing plants.

• SS316 is also more resistant to pitting a...read more
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Q8. How many percentage of chromium in SS304 & SS316
Ans. 
SS304 contains 18% chromium and SS316 contains 16-18% chromium.
• SS304 contains 18% chromium

• SS316 contains 16-18% chromium

• Chromium content in stainless steel enhances its corrosion resistance
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Q9. Which filler rod are used in SS304 and SS316
Ans. 
ER308 and ER316 filler rods are commonly used in SS304 and SS316 respectively.
• ER308 filler rod is used for welding SS304 stainless steel

• ER316 filler rod is used for welding SS316 stainless steel
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Q10. What is A106 GRB
Ans. 
A106 GRB is a specification for seamless carbon steel pipe for high-temperature service.
• A106 GRB is a grade of seamless carbon steel pipe.

• It is specifically designed for high-temperature service.

• It is commonly used in industrial applications such as oil and gas processing.

• A106 GRB pipes are known for their strength and durability.
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Q11. How many inches have you worked in the pipe
Ans. 
I have worked on pipes ranging from 2 inches to 24 inches in diameter.
• Worked on various pipe sizes including 2 inches, 4 inches, 6 inches, 8 inches, 12 inches, and 24 inches

• Experience with both small and large diameter pipes

• Skilled in handling different types of pipe materials such as PVC, steel, and copper
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Q12. Which filler and electrode used in P91
Ans. 
Filler material: E9015-B9, Electrode: E9018-B9
• Filler material for P91 is typically E9015-B9

• Electrode used for welding P91 is usually E9018-B9
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Q13. What is a procedure of P91 during fittup and welding
Ans. 
During fittup and welding of P91, preheating and post-weld heat treatment are crucial steps to prevent cracking and ensure proper weld quality.
• Preheating of P91 material to a specific temperature range before welding to reduce the risk of cracking

• Maintaining interpass temperature during welding to prevent rapid cooling and cracking

• Post-weld heat treatment of the welded joint to relieve residual stresses and ensure prop...read more
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Q14. Which types of filller and electrode used in P5
Ans. 
Filler metal and electrodes used in P5 are typically low alloy steel materials.
• Filler metal: Low alloy steel filler metals are commonly used in welding P5 materials.

• Electrodes: Low hydrogen electrodes are preferred for welding P5 due to their high strength and crack resistance.

• Examples: ER80S-D2 filler metal, E8018-B2 electrode
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Q15. What is preheat Temperature and cycles
Ans. 
Preheat temperature and cycles are important factors in mechanical engineering processes.
• Preheat temperature refers to the temperature at which a material or component is heated before further processing.

• Preheat cycles are the number of times a material or component is heated and cooled before the final processing step.

• Preheating helps reduce thermal shock, improve weld quality, and prevent cracking in materials.

• Exampl...read more
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Q16. What is postheat temperature and cycles
Ans. 
Postheat temperature and cycles refer to the temperature and number of heating and cooling cycles applied to a material after welding to relieve stress and prevent cracking.
• Postheat temperature is typically around 200-400 degrees Fahrenheit for carbon steels

• Postheat cycles involve heating the material to the specified temperature and holding it for a specific amount of time before allowing it to cool slowly

• Postheat tre...read more
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Q17. PWHT temperature and cycles
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Q18. Where are usd and prefared to Concentric Reducer and ECC reducer
Ans. 
Concentric reducers are preferred for cost-effective reduction in pipe size, while eccentric reducers are used when maintaining the same level is important.
• Concentric reducers are used when the center lines of the larger and smaller pipes are to be aligned.

• Eccentric reducers are used when maintaining the same level is important, such as in drainage systems.

• Concentric reducers are more cost-effective compared to eccentr...read more
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Q19. Why should be used ECC reducer in pump suction line
Ans. 
ECC reducer should be used in pump suction line to reduce turbulence and improve pump efficiency.
• ECC reducer helps in reducing turbulence in the pump suction line

• It helps in improving pump efficiency by reducing pressure drop

• It prevents cavitation in the pump which can damage the pump over time
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Q20. What things need to be kept in mind while working in a confined space
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Q21. How many volts of light are used in confined spaces
Ans. 
The voltage of light used in confined spaces varies depending on the specific lighting fixture and safety regulations.
• The voltage of light used in confined spaces can range from 12 volts for low voltage lighting to 120-277 volts for standard lighting fixtures.

• In some cases, special low voltage lighting may be required for safety reasons in confined spaces.

• It is important to follow safety regulations and guidelines when...read more
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Q22. What was the last project you did?
Ans. 
I recently led a team in designing and implementing a new automated assembly line for a manufacturing company.
• Managed a team of engineers and technicians to develop project timeline and budget

• Designed layout of assembly line to optimize efficiency and productivity

• Implemented automated machinery and conducted testing to ensure functionality

• Collaborated with production staff to train on new equipment and processes
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Q23. What distance do you provide support in 1.5 inch line
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Support is typically provided up to 50 feet in a 1.5 inch line.
• Support is usually provided every 6-8 feet in a 1.5 inch line to prevent sagging or stress on the line.

• Support can be in the form of clamps, brackets, or hangers depending on the specific installation requirements.

• Proper support ensures the line remains secure and stable, preventing leaks or damage.

• For example, in a industrial setting, a 1.5 inch steam line...read more
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Q24. What is jsa. And why used
Ans. 
JSA stands for Job Safety Analysis. It is used to identify and control hazards in the workplace.
• JSA is a systematic process for identifying potential hazards in a job task or process.

• It involves breaking down the task into steps, identifying potential hazards at each step, and implementing controls to mitigate those hazards.

• JSA helps in preventing accidents and injuries by ensuring that workers are aware of the risks a...read more
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Q25. If any area providing the responsibility to you for piping then what should be taken 1st steps
Ans. 
The first steps in taking responsibility for piping involve conducting a thorough assessment, creating a plan, and ensuring compliance with regulations.
• Conduct a thorough assessment of the current piping system to identify any issues or areas for improvement

• Create a detailed plan outlining the necessary steps to address any identified issues and improve the piping system

• Ensure compliance with relevant regulations and s...read more
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Q26. How many inches of welding does a welder make in a shop and filed
Ans. 
The amount of welding done by a welder in a shop and field varies depending on the project and requirements.
• The amount of welding done by a welder can range from a few inches for small projects to several feet for larger projects.

• In a shop setting, a welder may typically work on smaller pieces requiring less welding compared to field work which may involve larger structures.

• Factors such as the type of welding process u...read more
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Q27. During MC you have installed control valve or not.
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Q28. During piping febrication and Erection you have only prefared ISO or p&id
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Q29. How to cross chek piping missing components
Ans. 
To cross check piping missing components, use piping and instrumentation diagrams (P&IDs), conduct physical inspections, compare with design specifications, and use 3D modeling software.
• Refer to piping and instrumentation diagrams (P&IDs) to identify all components in the piping system

• Conduct physical inspections of the piping system to visually check for missing components

• Compare the actual piping layout with the desi...read more
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Q30. Can S316 fittings be used in S304 or not
Ans. 
Yes, S316 fittings can be used in S304 applications.
• S316 fittings can be used in S304 applications due to their similar corrosion resistance properties.

• Both S316 and S304 are austenitic stainless steels, so they are compatible for most applications.

• However, it is important to consider the specific requirements of the application before using S316 fittings in S304 systems.
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30 minutes and 30 questions

Was really good...but I failed

Q1. Whats your aim in life
Ans. 
My aim in life is to make a positive impact on others through my work and actions.
• To continuously learn and grow in my chosen field

• To contribute to society in a meaningful way

• To inspire and motivate others to reach their full potential
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Q2. Why l and t
Ans. 
Larsen & Toubro (L&T) is a multinational conglomerate company known for its engineering and construction projects.
• L&T is a leading construction company in India

• They are involved in various sectors such as infrastructure, power, defense, and technology

• L&T has a strong reputation for delivering high-quality projects on time and within budget
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Q1. WPS essential variables
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Q2. Welding positions
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Q1. How did you store management?
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Q2. How did you inventory management?
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Q3. What is Store incharge process?
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Q4. What is Store manager process
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Q5. How did find store manager post?
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Q1. Related Non conformance
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Q2. Questions from related the work scop
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Q3. What is non conference?
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Q4. What is should be the contains in ncr
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Q1. Explain basic components in Electronics
Ans. 
Basic components in Electronics include resistors, capacitors, inductors, diodes, transistors, and integrated circuits.
• Resistors: Control the flow of electric current in a circuit.

• Capacitors: Store and release electrical energy.

• Inductors: Store energy in a magnetic field.

• Diodes: Allow current to flow in one direction only.

• Transistors: Amplify or switch electronic signals.

• Integrated Circuits: Combine multiple components
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Q2. What is power and its units
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Power is the rate at which work is done or energy is transferred. Its units are watts (W) in the International System of Units.
• Power is the amount of energy transferred or converted per unit time.

• The SI unit of power is the watt (W), which is equal to one joule per second.

• Other common units of power include horsepower (hp) and kilowatt (kW).

• Power can be calculated using the formula: Power = Work / Time
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