Which equipment is commonly used to remove dispersed water (moisture) from lubricating oil in refinery or lube-conditioning service?

Introduction / Context:
Water contamination in lubricating oils reduces film strength, promotes corrosion, and accelerates oxidation. Efficient separation of water droplets from viscous oils is essential in maintenance and refining operations.

Given Data / Assumptions:

• Oil contains dispersed water (emulsified or fine droplets).
• We need a continuous, compact device with high g-force.

Concept / Approach:
Tubular-bowl centrifuges produce very high centrifugal accelerations, rapidly separating water from oil based on density difference. Gravity clarifiers are too slow for fine droplets; sparkler and vacuum leaf filters remove solids, not immiscible liquid droplets. Coalescers may also be used, but among listed options, the tubular centrifuge is the standard choice.

Step-by-Step Solution:
Identify separation type: liquid–liquid (immiscible) with fine droplets.Match to equipment: high-g centrifuge enhances droplet migration.Select tubular centrifuge.

Verification / Alternative check:
Lube oil purifiers often employ disc-stack/tubular centrifuges for water removal.

Why Other Options Are Wrong:
Clarifier: too slow for fine dispersion.Sparkler/Vacuum leaf: solid–liquid filtration devices, not suited to separating water droplets from oil.

Common Pitfalls:
Assuming any filter removes water; filters generally target solids unless paired with coalescing media.

Final Answer:
Tubular centrifuge