Petrofac Piping Designer Interview Questions and Answers

Q1. What is your job roles
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Q2. How to manage your team
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Q1. How much carbon percentage in Carbon Steel
Ans. 
The carbon percentage in carbon steel varies from 0.05% to 2.0% depending on the grade.
• Carbon steel is an alloy of iron and carbon.

• The amount of carbon in carbon steel determines its strength and hardness.

• Low carbon steel contains less than 0.3% carbon, while high carbon steel contains more than 0.6% carbon.

• Some common grades of carbon steel and their carbon percentage are: A36 (0.26%), 1018 (0.18%), and 1045 (0.45%).
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Q2. What is difference between concentric and eccentric reducer
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Concentric reducers have a common centerline while eccentric reducers have an offset centerline.
• Concentric reducers are used in vertical piping systems to prevent accumulation of air pockets.

• Eccentric reducers are used in horizontal piping systems to prevent accumulation of solids or liquids.

• Concentric reducers are symmetrical while eccentric reducers are not.

• Concentric reducers are easier to manufacture and install th
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Q3. Which reinforcement fittings used in piping
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Reinforcement fittings are used to strengthen and support piping systems.
• Common reinforcement fittings include tees, elbows, reducers, and couplings.

• Telescoping fittings are used to adjust the length of piping systems.

• Flange fittings are used to connect pipes to other equipment or structures.

• Saddles are used to support piping systems on walls or ceilings.

• Reinforcement fittings can be made of various materials, includin...read more
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Q4. Why elbo let used in piping
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Elbow lets change the direction of flow in piping system.
• Elbows are used to change the direction of flow in a piping system.

• They come in different angles such as 45°, 90° and 180°.

• They are available in different materials such as PVC, copper, steel, etc.

• Elbows can be welded or threaded onto the piping system.

• They are commonly used in plumbing, HVAC, and industrial piping systems.
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Q5. If we have to replace bypass valve on top of vessel and plant is running, then how to replace that valve ??
Ans. 
The bypass valve can be replaced by isolating the vessel, depressurizing it, and then replacing the valve.
• Isolate the vessel by closing the inlet and outlet valves

• Depressurize the vessel by venting the gas or liquid

• Remove the old valve and install the new one

• Repressurize the vessel and open the inlet and outlet valves
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Q6. What is Permit to work
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Permit to work is a formal written system used to control high-risk activities.
• It is a document that outlines the work to be done and the hazards associated with it.

• It is used to ensure that all necessary safety precautions are taken before work begins.

• It is issued by a competent authority and must be signed by all parties involved in the work.

• Examples include hot work permits, confined space permits, and excavation pe
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Q7. Tell me about yourself and your experience
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Q8. What is isolation and how many types of isolation
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Isolation is the process of separating a system or equipment from its energy source to ensure safety during maintenance or repair.
• Isolation involves disconnecting a system or equipment from its power source, locking it out, and tagging it to prevent accidental re-energization.

• There are two types of isolation: electrical isolation and mechanical isolation.

• Electrical isolation involves disconnecting the electrical supply...read more
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Q9. What is positive isolation
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Positive isolation is the process of completely isolating a section of a system to prevent any flow or transfer of material.
• Positive isolation is achieved by using valves, blinds, or other physical barriers to completely block the flow of material.

• It is important for safety and maintenance purposes, as it allows workers to safely perform tasks without the risk of exposure to hazardous materials.

• Examples of positive iso...read more
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Q10. How to do positive isolation
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Positive isolation is the process of completely isolating a section of piping or equipment from the rest of the system to perform maintenance or repairs.
• Identify the section of piping or equipment that needs to be isolated

• Close all valves and block all lines leading to and from the section

• Use blind flanges or spectacle blinds to physically block the section

• Ensure that the isolation is secure and pressure tested before ...read more
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Q11. When we do nitrogen purging and why it's required
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Nitrogen purging is done to remove impurities and oxygen from pipelines before commissioning or maintenance work.
• Nitrogen purging is done to create an inert atmosphere inside the pipeline to prevent explosions or fires.

• It is required before commissioning or maintenance work to remove impurities and oxygen from the pipeline.

• Nitrogen purging is also done to prevent corrosion and contamination of the pipeline.

• It is common...read more
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Q12. What is difference between pipe and tube
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Pipes are used to transport fluids and gases, while tubes are used for structural purposes.
• Pipes have a standardized outer diameter and wall thickness, while tubes have a standardized inner diameter and wall thickness.

• Pipes are typically round, while tubes can be round, square, or rectangular.

• Pipes are often used in plumbing and HVAC systems, while tubes are used in construction and engineering applications.

• Pipes are u...read more
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Q13. Which pipe material or standard used in past experience
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I have experience working with various pipe materials and standards including carbon steel, stainless steel, and PVC.
• I have worked with carbon steel pipes in a power plant project.

• I have also worked with stainless steel pipes in a pharmaceutical plant project.

• In a water treatment plant project, I have worked with PVC pipes.

• I am familiar with ASME B31.3, API 5L, and ASTM standards for pipe materials and welding procedur
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Q1. Isometric drawing based questions and Safety based questions
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Q1. Salary Availability for company
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Q1. Final in Site Construction manager asking some technical questions
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Q1. Safety,material code,
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Q2. Public dealing,work load, progress
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Q1. Fpso module experience
Ans. 
Yes, I have experience in designing modules for FPSOs.
• I have designed modules for FPSOs such as process modules, utility modules, and accommodation modules.

• I am familiar with the requirements and standards for FPSO module design, such as DNVGL-ST-0358 and ABS Guide for Building and Classing Floating Production Installations.

• I have worked with various software tools for module design, such as PDMS, E3D, and AutoCAD.

• I ha...read more
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Q2. Slops of fpso from foreword to aft and aft to foreword
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The slops of an FPSO from forward to aft and aft to forward.
• Slops refer to the angle of inclination of the ship's deck.

• The slope of an FPSO from forward to aft is usually positive, while the slope from aft to forward is usually negative.

• The slope is designed to ensure that any liquids on the deck flow towards the drainage points.

• The slope can vary depending on the specific design of the FPSO and the requirements of the
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Q3. Open and closed drain system
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Q1. E3D Draw Module
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It was that numerical and quantitative test

Q1. Piping technical questions
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Q2. Mechanical engineering basics
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Q1. Piping material details pipe code
Ans. 
Piping material details include pipe code which specifies the type, size, and material of the pipe.
• Pipe code is a standardized system used to identify the type, size, and material of a pipe.

• Examples of pipe codes include ASTM A106 for carbon steel pipes and ASTM A312 for stainless steel pipes.

• Understanding pipe codes is essential for selecting the right materials for piping projects.
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Q2. What's the cs ,ss pipe code
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CS and SS pipe codes refer to the material specifications for carbon steel and stainless steel pipes used in piping systems.
• CS pipe code typically refers to ASTM A106 for seamless carbon steel pipes or ASTM A53 for welded carbon steel pipes.

• SS pipe code typically refers to ASTM A312 for seamless stainless steel pipes or ASTM A358 for welded stainless steel pipes.

• CS pipes are commonly used in industrial applications, wh...read more
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