Hydraulic Filtration Engineering

Hydraulic Contamination Sensitivity

Why particle contamination causes 70–80% of hydraulic failures — component clearance tolerances and the critical 5–15 µm damage range.

Contamination Control Fundamentals

The contamination balance equation, ingression pathways, and how ISO 4406 cleanliness codes define achievable system cleanliness targets.

ISO 4406 Cleanliness Coding

Reading and specifying three-channel ISO 4406 codes: what Range Numbers mean, how to set targets by component type, and how to interpret oil analysis reports.

ISO 4406 Standard Reference

The particle contamination coding standard — measurement methodology, Range Number definitions, and relationship to ISO 16889 test results.

Beta Ratio and Filter Efficiency

How ISO 16889 Beta ratio is measured and calculated, what the numbers mean in practice, and why nominal micron ratings are not equivalent specifications.

ISO 16889 Standard Reference

The multi-pass test method that defines Beta ratio and dirt-holding capacity — the primary performance qualification framework for hydraulic filters.

ISO 4406 Cleanliness Scale

Visual reference: Range Number scale, particle count thresholds, and target codes mapped to component sensitivity levels.

ISO 4406 Code Converter

Convert between particle counts per mL and ISO 4406 Range Numbers, and compare codes across cleanliness targets.

Hydraulic Power Unit Design

Applying contamination control principles to HPU design: reservoir sizing, filter placement, kidney-loop circuits, and commissioning flushing protocols.