SIST EN 720-1:2000

Overview

EN 720-1:1999 - Transportable gas cylinders: Gases and gas mixtures - Part 1: Properties of pure gases (CEN) defines how the physical and chemical properties of pure gases are classified for safe use with transportable gas cylinders. The standard’s primary purpose is to specify the properties that affect the choice of cylinder valve outlets and related safety equipment. It groups gases according to four main criteria: fire potential, toxicity, state of gas, and corrosiveness.

Key Topics

• Classification criteria
  • Fire potential: flammability and combustibility characteristics relevant to storage and transport.
  • Toxicity: health hazards and inhalation risks influencing handling and labeling.
  • State of gas: behavior under pressure and temperature (e.g., compressed, liquefied) that affects cylinder selection and fittings.
  • Corrosiveness: chemical action on valve materials and cylinder components that determines compatible valve and outlet materials.
• Purpose-driven requirements
  • Use of the four criteria to determine suitable valve outlets and connection types for transportable cylinders.
  • Guidance to ensure compatibility between gas properties and cylinder fittings to reduce leakage, material degradation, and unsafe releases.
• Scope limits
  • Focuses on pure gases; properties of gas mixtures or procedural testing are outside Part 1’s primary remit (other parts of EN 720 or related standards address mixtures).

Applications

• Cylinder manufacturers use EN 720-1 to select appropriate valve designs and materials for different gases.
• Industrial gas suppliers and distributors apply the standard when configuring cylinder valve outlets and preparing gas-specific inventories.
• Safety engineers and HSE professionals reference the classification to assess storage, handling, and emergency response measures.
• Maintenance and fitting technicians rely on the standard to choose compatible connectors, regulators, and leak-prevention systems.
• Regulatory authorities and procurement teams use the documented properties to align procurement and certification with European best practice.

Related Standards

• EN 720-1 is part of the broader EN 720 series addressing gases and gas mixtures for transportable cylinders. Organizations should consult additional parts of EN 720 and other CEN/CENELEC standards covering cylinder construction, testing, labeling, and gas mixture properties for comprehensive compliance.

Keywords: EN 720-1, transportable gas cylinders, properties of pure gases, valve outlets, fire potential, toxicity, corrosiveness, state of gas, CEN.