Overview
EN ISO 3170:2025 - Hydrocarbon Liquids - Manual Sampling (ISO 3170:2025) is the updated CEN/ISO standard that specifies manual methods for obtaining samples of liquid and semi-liquid hydrocarbons, tank residues and deposits from fixed tanks, railcars, road vehicles, ships and barges, drums and cans, and from liquids in pipelines. It applies to products such as crude oils, intermediate products, synthetic hydrocarbons and biofuels stored at or near atmospheric pressure or conveyed as liquids at elevated pressures and temperatures. This fourth edition (2025) supersedes EN ISO 3170:2004.
Key Topics
The standard focuses on practical and safety-critical aspects of manual sampling rather than laboratory test methods. Major technical topics include:
- Scope and applicability - types of hydrocarbon liquids covered and explicit exclusions (special products covered by IEC 60475, ISO 4257, ISO 8943, ISO 10715).
- Safety requirements - general site safety, confined space entry, electrical safety, and static electricity control for sampling operations.
- Sampling principles - requirements to obtain representative samples and to assess product homogeneity before sampling.
- Sampling locations and methods - procedures for tank sampling, line (pipeline) sampling, and sampling from mobile containers (railcars, road tankers, ships, drums).
- Restricted-opening and vapour-trap sampling - techniques for sampling through small access points while controlling vapour and contamination.
- Sampling equipment - overview of acceptable equipment types (spot samplers, zone/flow‑through samplers, running samplers) and performance expectations.
- Safety of sampling points and equipment - positioning and installation considerations to minimise risk and ensure sample integrity.
Applications
EN ISO 3170:2025 is a practical guidance and compliance document used to ensure reliable, reproducible manual sampling of hydrocarbon liquids for quality control, custody transfer, regulatory compliance and forensic investigation. Typical uses:
- Routine and custody-transfer sampling at terminals, depots and refineries
- Pipeline sampling during transfers and batch monitoring
- Spot checks and investigatory sampling of tank residues or deposits
- Sampling for laboratory analysis of composition, contaminants, water content and quality
Who uses this standard:
- Refinery and terminal operators
- Oil & gas transporters and logistics providers (road, rail, marine)
- Third‑party sampling and inspection companies
- Quality assurance laboratories and testing facilities
- Regulators, auditors and compliance teams
Related Standards
Relevant standards referenced or explicitly excluded include:
EN ISO 3170:2025 is essential for anyone involved in manual sampling of hydrocarbon liquids who needs consistent, safe and representative sampling procedures. Keywords: EN ISO 3170:2025, manual sampling, hydrocarbon liquids, tank sampling, pipeline sampling, sampling equipment, representative samples, crude oil sampling.