ADNOC Interview Questions, Process, and Tips

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
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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. How many years experience?
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Q2. What is tha qualification?
Ans. 
The qualification for an Instrumentation Technician typically includes a degree or diploma in instrumentation technology or a related field.
• A degree or diploma in instrumentation technology or a related field is usually required.

• Knowledge of electrical and electronic systems is important.

• Experience with calibration and troubleshooting of instruments is often necessary.

• Familiarity with industry standards and regulations...read more
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Q3. Is currently working?
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Q4. Before working company
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Q1. What is Thermocouple range?
Ans. 
Thermocouple range refers to the temperature range within which a thermocouple can accurately measure temperature.
• Thermocouple range varies depending on the type of thermocouple used.

• Common thermocouple types include J, K, T, E, and N.

• For example, a type K thermocouple has a range of -200 to 1350 degrees Celsius.

• It is important to select the appropriate thermocouple type for the temperature range being measured.
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Q2. What is anti surge valve?
Ans. 
An anti-surge valve is a control valve used in a compressor system to prevent surge and maintain stable operation.
• An anti-surge valve is typically installed in the discharge line of a compressor.

• It is designed to protect the compressor from surge, which is a phenomenon of unstable flow and pressure that can cause damage to the compressor.

• The valve opens or closes based on the compressor's operating conditions to mainta...read more
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Q3. Are you working gas turbine?
Ans. 
Yes, I have experience working with gas turbines.
• I have worked with gas turbines in my previous job as an instrumentation technician.

• I am familiar with the maintenance and troubleshooting of gas turbines.

• I have experience in calibrating and testing gas turbine sensors and instruments.

• I have knowledge of the safety protocols and regulations related to gas turbines.
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Q4. How many types vibration is there in field?
Ans. 
There are three types of vibration in the field: axial, radial, and tangential.
• Axial vibration occurs parallel to the axis of rotation.

• Radial vibration occurs perpendicular to the axis of rotation.

• Tangential vibration occurs at a right angle to both axial and radial vibration.

• Vibration analysis is used to detect and diagnose problems in rotating machinery.

• Excessive vibration can lead to premature failure of bearings, g
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Q5. Are you know that preventive maintenance jobs?
Ans. 
Yes, I am familiar with preventive maintenance jobs.
• Preventive maintenance involves regularly scheduled inspections, cleaning, and repairs to prevent equipment breakdowns.

• I have experience performing preventive maintenance on various types of instrumentation equipment, such as calibrators, transmitters, and controllers.

• Examples of preventive maintenance tasks I have performed include checking for leaks, replacing worn ...read more
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Q1. Are you instrument technician?
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Q2. What kind of precautions need in Plant running time?
Ans. 
Precautions are necessary to ensure safe and efficient plant operation.
• Regular maintenance of equipment and machinery

• Proper training and certification of personnel

• Strict adherence to safety protocols and procedures

• Regular inspections and audits to identify potential hazards

• Effective communication and coordination among team members

• Use of personal protective equipment (PPE) as required

• Emergency response planning and dri...read more
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I am interested to work in maintenance field and troubleshooting

Q1. Technical questions about the university topics
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Q2. General questions about strength , weakness
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Q1. What is your experience
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Q2. What is your expectations
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