Overview
ISO 11118:2015 - Gas cylinders - Non-refillable metallic gas cylinders - Specification and test methods - is an international standard that sets minimum requirements for the design, materials, manufacture, inspection and testing of non‑refillable metallic gas cylinders (welded, brazed or seamless) used for compressed and liquefied gases. The standard also covers requirements and test methods for non‑refillable sealing devices and includes type approval, batch testing and marking provisions for safe use, handling and transport.
Key topics and technical requirements
- Scope and pressure limits
- Applicable to non‑refillable cylinders for compressed and liquefied gases with specified limits:
- Liquefied gases: test pressure ≤ 250 bar
- Compressed gases: test pressure ≤ 450 bar
- Product of test pressure and water capacity: p·V ≤ 1 000 bar·L
- For p > 45 bar, water capacity V ≤ 5 L
- Materials
- Requirements for carbon and low‑alloy steels, aluminium and aluminium alloys, and austenitic stainless steels (chemical composition and corrosion resistance requirements included).
- Design and construction
- Rules for pressure‑containing parts, design drawings, construction types (seamless, welded, brazed) and workmanship expectations.
- Manufacturing controls
- Welding qualifications, heat treatment/aging, processing controls to avoid strain aging, and inspection criteria for each cylinder.
- Testing and type approval
- Prototype and production tests including tensile, burst, drop, dimension checks, valve-to-cylinder interface tests, and inspection regimes (type approval and batch testing).
- Annex A: specifications and prototype testing for non‑refillable sealing devices.
- Marking and documentation
- Manufacturing, operational markings and certificates of compliance aligned with UN transport requirements. Informative annexes (type approval certificate, compliance certificate, YPE guidance).
Practical applications and who uses this standard
ISO 11118:2015 is used by:
- Cylinder manufacturers designing and producing non‑refillable metallic gas cylinders
- Test laboratories performing prototype and batch tests (burst, tensile, drop)
- Valve and sealing device manufacturers ensuring compatibility and non‑refillability
- Regulators, transport authorities and safety managers specifying acceptance and marking rules for transport and handling
- Buyers and end users requiring verified conformity for single‑use gas cylinders (medical, welding, specialty gases, consumer aerosols where applicable)
Related standards
Commonly used with:
ISO 11118:2015 provides a practical framework to ensure safe, consistent manufacture and testing of non‑refillable metallic gas cylinders for international acceptance and transport compliance.