UOP 565-05 is a laboratory test method for measuring acid number and naphthenic acids by titration, helping users evaluate the acidic character of petroleum-related samples with a controlled analytical approach. For refinery and fuel laboratory teams, this kind of method can support product review, sample comparison, and quality documentation where acidity-related behavior matters. UOP 565-05 is relevant to analysts and technical reviewers who need a consistent way to assess acid number alongside naphthenic acid content in petroleum and chemical workflows. It provides a practical reference for laboratory decision-making and method selection.

Purpose of UOP 565-05

The purpose of UOP 565-05 is to provide a standardized titration-based measurement method for acid number and naphthenic acids. As a UOP test method, it is intended for analytical use in laboratories that need a reliable way to characterize acidic components in petroleum or related process samples. This makes the method useful when comparing samples, documenting test results, or supporting technical evaluation in refinery and chemical quality programs. It is especially relevant where acidity-related properties must be tracked consistently across laboratory work.

Laboratory use of UOP 565-05

UOP 565-05 is commonly suited to petroleum testing laboratories, refinery QA/QC groups, and analytical chemistry teams that review sample acidity as part of routine or investigative work. It may be used during product assessment, process sample review, or technical validation of materials where acid number and naphthenic acids are important indicators. Laboratory analysts, petroleum specialists, and quality personnel can use the method as part of structured test programs that support comparison, documentation, and internal review of results.

Practical importance of UOP 565-05

In day-to-day use, UOP 565-05 helps teams apply a consistent titration method to acidity-related testing, which supports clearer laboratory comparisons and more dependable documentation. That can be important when evaluating changes in sample quality, reviewing supplier or process materials, or confirming whether results fit internal specifications and technical expectations. For organizations that depend on repeatable analytical data, the method offers a focused way to support quality control, data interpretation, and routine petroleum laboratory workflows without adding unnecessary complexity.

• Acid number evaluation
• Naphthenic acids by titration
• Petroleum and process sample review
• Refinery laboratory QA/QC support
• Analytical chemistry documentation
• Technical comparison of acidic properties