UOP 481-91 is the UOP method for Water in Liquid Hydrocarbons by Coulometry, giving laboratories a focused way to evaluate moisture in liquid hydrocarbon samples. For buyers reviewing petroleum testing methods, this standard helps define a clear analytical approach for checking water content, which can affect product quality, handling, and downstream performance. UOP 481-91 is relevant when a lab needs a recognized procedure for moisture measurement in refinery, fuel, or chemical process samples and wants a method that supports consistent technical review and quality decisions.

UOP 481-91 method scope

This UOP test method is centered on the determination of water in liquid hydrocarbons using a coulometric analytical approach. In practical terms, it is intended for laboratory measurement of moisture in hydrocarbon-based liquids where water content may influence specification checks, product assessment, or process evaluation. As a petroleum and chemical laboratory method, UOP 481-91 fits workflows that require a defined analytical reference for comparing samples, documenting results, and supporting quality-focused review without extending beyond the method’s stated purpose.

Where is UOP 481-91 used?

UOP 481-91 is commonly used in laboratory environments supporting refineries, petrochemical operations, and fuel testing programs where water in liquid hydrocarbons must be checked as part of routine analysis or incoming sample review. It may be relevant to laboratory analysts, QA/QC teams, technical reviewers, and petroleum specialists who need a standard method for evaluating moisture-related sample condition. The method also supports technical documentation and product comparison work when water content is a material factor in decision-making.

Why professionals use UOP 481-91

Professionals use UOP 481-91 to help maintain consistency in water testing across liquid hydrocarbon samples and to support clear laboratory interpretation of results. A defined coulometric method can improve comparability between batches, aid quality verification, and provide a stronger basis for internal technical review. For teams managing refinery product quality or laboratory reporting, this method helps align testing practice with a recognized UOP standard and keeps analytical documentation focused and defensible.

• Water measurement in liquid hydrocarbons
• Coulometric laboratory analysis
• Refinery and fuel sample review
• QA/QC support for product quality
• Useful for analysts, chemists, and technical reviewers