ISO 21072-3:2020

Overview

ISO 21072-3:2020 specifies a standardized methodology for full-scale performance testing of oil skimmers handling high-viscosity oil (viscosity above 50 000 cP). Designed for tests conducted in a controlled basin, the standard defines test arrangements, measurement methods and reporting requirements so end users can objectively compare skimmer design and performance for marine environment protection and oil spill response.

Key topics and technical requirements

• Scope and applicability
  • Applies to all types of skimmers provided equipment fits within the physical limits of the test basin.
  • For dedicated/in‑built systems, procedures apply only to the skimming device itself, not the entire system.
• Test fluids and classes
  • Focus on oils and emulsions with viscosity measured at shear rates of 1 and 10 s⁻¹.
  • Defines oil classes (example: Class 7 target 100 000 cP; Class 8 target 500 000 cP) and allowable ranges.
• Test facility controls
  • Maintain oil properties and control slick characteristics.
  • Water temperature held at selected test temperature with max variation ±2 °C.
  • Oil slick thickness measurement accuracy at least ±20 %.
  • Calibrated measuring tanks sized to expected recovery rates to ensure accurate data collection periods.
• Clearance and physical constraints
  • Side clearance at least 50 % of the skimmer’s extreme width; sufficient clearance from tank floor to avoid interference.
• Performance parameters and definitions
  • Fluid Recovery Rate (FRR), Oil Recovery Rate (ORR), Recovery Efficiency (RE), Emulsification Factor (EF).
  • Concepts of steady‑state period and data collection period for valid measurements.
• Test procedure and quality control
  • Procedures cover preparations, actions during testing, and post‑test steps.
  • Requirements for measurement, reporting (oil properties, environmental and operating parameters) and repeatability (test duration, repetitions).

Applications and users

• Who uses this standard
  • Skimmer manufacturers and design engineers validating product performance.
  • Independent test laboratories conducting basin trials.
  • Regulators, procurement officers and oil spill response organizations comparing equipment for contingency planning.
  • Operators and emergency responders assessing expected recovery performance for heavy fuels, bitumen or emulsified high‑viscosity oils.
• Practical value
  • Provides reproducible, quantitative metrics (ORR, FRR, RE) to support procurement decisions, equipment certification, and operational planning.
  • Helps estimate limitations and supports safer selection of skimmers for high‑viscosity spill scenarios while cautioning about differences between controlled tests and field conditions.

Related standards

• ISO 16165 (vocabulary for oil spill response) is a normative reference.
• ISO 21072 series covers broader skimmer performance testing topics; consult the series for other oil viscosity ranges and related procedures.

Keywords: ISO 21072-3:2020, oil skimmers, high viscosity oil, performance testing, marine environment protection, oil recovery rate, fluid recovery rate, oil spill response.