SIST EN ISO 20764:2004 PDF

Overview

EN ISO 20764:2003 - Petroleum and related products: Preparation of a test portion of high‑boiling liquids for the determination of water content - Nitrogen purge method (ISO 20764:2003) defines laboratory procedures to prepare test portions from petroleum and related materials boiling above 200 °C for subsequent water content determination. The standard covers two nitrogen‑purge extraction procedures (atmospheric pressure and reduced pressure) to generate samples suitable for Karl Fischer titration over the range 3 mg/kg to 1 000 mg/kg. It applies to unused and used lubricating oils, non‑aqueous hydraulic fluids and high‑boiling solvents.

Key Topics and Requirements

• Scope and applicability: High‑boiling petroleum products (>200 °C), lubricating oils, hydraulic fluids, high‑boiling solvents. Target water range 3–1 000 mg/kg.
• Two extraction procedures:
  • Atmospheric pressure method: nitrogen purge at 120 °C, typical duration 60 ± 5 min.
  • Reduced pressure method: nitrogen purge at 60 °C under vacuum 0.30–0.65 kPa, typical duration 90 ± 5 min (for used oils or materials with high water retention).
• Reagents and gases: Pure, dried nitrogen (flow ~3 L/h ± 0.3 L/h; oxygen