SABIC Interview Questions and Answers

The diameter of a distillation column is designed based on factors such as feed flow rate, composition, pressure, and efficiency.

• Calculate the required vapor and liquid flow rates based on the feed composition and desired separation efficiency.

• Consider the pressure drop along the column and the desired residence time for the vapor and liquid phases.

• Use design equations and correlations to determine the optimal diameter...read more

Number of trays and reflux ratio can be calculated using various methods such as McCabe-Thiele method or Fenske equation.

• Use McCabe-Thiele method for distillation columns to determine number of trays required.

• Calculate reflux ratio by dividing the liquid returning to the column by the liquid leaving the top tray.

• Consider factors such as desired separation efficiency and operating conditions when determining number of t...read more

Tray is used for organizing items while packing is the process of placing items in a container for transportation or storage.

• Tray is typically used for organizing small items or serving food, while packing involves placing items in a container for transportation or storage.

• Trays can come in various sizes and materials, such as plastic, metal, or wood, while packing materials can include boxes, bags, or containers.

• Examp...read more

To calculate pressure drop in a pipe, use the Darcy-Weisbach equation or the Hazen-Williams equation.

• Use the Darcy-Weisbach equation: ΔP = f * (L/D) * (ρ * V^2) / 2

• Use the Hazen-Williams equation: ΔP = 10.67 * Q^1.85 / (C^1.85 * D^4.87)

• Where ΔP is the pressure drop, f is the Darcy friction factor, L is the pipe length, D is the pipe diameter, ρ is the fluid density, V is the fluid velocity, Q is the flow rate, and C is...read more

Le Chatelier's principle states that a system at equilibrium will respond to a stress by shifting to counteract the stress and restore equilibrium.

• If a stress is applied to a system at equilibrium, the system will adjust to minimize the effect of the stress.

• Changes in concentration, pressure, or temperature can cause a shift in equilibrium.

• For example, if more reactants are added to a system at equilibrium, the system ...read more

I prioritize tasks, set clear timelines, and maintain open communication to effectively manage multiple projects.

• Prioritization: I use a priority matrix to categorize tasks based on urgency and importance, ensuring critical projects are addressed first.

• Time Management: I allocate specific time blocks for each project, allowing focused work sessions to enhance productivity.

• Regular Check-ins: I schedule weekly meetings w...read more

Effective stakeholder management involves communication, understanding needs, and building relationships for project success.

• Identify stakeholders early: Recognize who will be affected by the project and their influence.

• Establish clear communication: Use regular updates and meetings to keep stakeholders informed.

• Understand their needs: Conduct interviews or surveys to gather insights on stakeholder expectations.

• Build r...read more

Read basic polymer synthesis and analytical tool.

Bearing problems can occur due to various reasons such as lack of lubrication, misalignment, contamination, or wear and tear.

• Lack of lubrication can lead to increased friction and heat generation, causing premature bearing failure.

• Misalignment of shafts can put additional stress on the bearings, leading to wear and eventual failure.

• Contamination from dirt, dust, or moisture can accelerate wear and corrosion of the bear...read more

A mechanical seal is typically removed by disassembling the equipment and carefully extracting the seal components.

• Disassemble the equipment to access the mechanical seal

• Carefully remove the seal components without causing damage

• Inspect the seal faces for wear or damage

• Replace the mechanical seal if necessary

• Reassemble the equipment properly

Inspection spare parts are crucial for ensuring equipment reliability and minimizing downtime.

• Inspection spare parts should be readily available in case replacements are needed during routine maintenance checks.

• Regularly inspecting spare parts for wear and tear can help prevent unexpected failures.

• Properly labeling and organizing spare parts can streamline the inspection process and ensure efficiency.

• Maintaining an inv...read more

Impeller clearance is the distance between the impeller and the pump casing.

• Impeller clearance is crucial for the efficient operation of rotating equipment.

• It is typically measured using feeler gauges or dial indicators.

• Proper impeller clearance ensures optimal performance and prevents damage to the equipment.

• Clearance adjustments may be necessary during maintenance or troubleshooting.

• Incorrect impeller clearance can l...read more

Fixing a mechanical seal involves identifying the issue, disassembling the equipment, replacing the seal components, and reassembling the equipment.

• Identify the issue with the mechanical seal, such as leakage or wear

• Disassemble the equipment to access the seal components

• Replace the damaged or worn seal components with new ones

• Ensure proper alignment and installation of the new seal components

• Reassemble the equipment an...read more

Common problems during pump disassembly

• Seized bolts or nuts making it difficult to disassemble

• Corrosion or rust causing parts to stick together

• Worn out gaskets or seals leading to leaks

• Misalignment of components making reassembly challenging

Gearbox overhauling involves disassembly, inspection, replacement of worn parts, reassembly, and testing.

• Start by thoroughly cleaning the gearbox and surrounding area

• Carefully disassemble the gearbox, taking note of the position of each component

• Inspect all parts for wear, damage, or signs of failure

• Replace any worn or damaged parts with new ones

• Reassemble the gearbox following the manufacturer's specifications

• Perform ...read more