Praxair Interview Questions and Answers

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

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