ISO 18172-1:2007

Overview

ISO 18172-1:2007 sets out the minimum requirements for refillable, transportable welded stainless steel gas cylinders with test pressures up to 6 MPa (60 bar). Developed by the International Organization for Standardization (ISO), this standard covers cylinders with water capacities from 0.5 liters to 500 liters, used for transporting compressed, liquefied, and dissolved gases. It addresses essential aspects including material selection, design, construction quality, manufacturing processes, testing methodologies, as well as marking and certification requirements.

Key Topics

• Material and Heat Treatment

  • Specifies the use of stainless steels in various categories (ferritic, austenitic, duplex) compatible with intended gas service and resistant to issues like intergranular corrosion.
  • Emphasizes traceability and quality certificates for materials and heat treatments.

• Cylinder Design

  • Details design calculations for cylinder wall thickness, convex ends, and minimum thickness requirements.
  • Defines rules for openings, reinforcement, weld quality, and out-of-roundness limits.
  • Additional design requirements are indicated for large transportable cylinders (over 150 l), including necessary handling provisions.

• Manufacturing and Workmanship

  • Outlines production processes including welding, cryoforming, and cold forming.
  • Welding procedures and personnel must be qualified to international standards.
  • Specifies requirements for attachments, valve protection, and straightness/verticality of cylinders.

• Testing and Inspection

  • Establishes procedures for batch and individual testing: tensile, bend, hardness, pressure, and leakage tests.
  • Requires new design approval through extensive testing (design, batch, and non-destructive tests).
  • Stipulates radiographic inspections and the handling of manufacturing defects.

• Marking and Certification

  • Mandates durable and clear cylinder markings according to recognized standards for traceability.
  • Manufacturers must provide certificates for design type and each batch.

Applications

ISO 18172-1:2007 is critically important in sectors requiring safe storage and transport of industrial and specialty gases, such as:

• Industrial gas supply and logistics
• Medical oxygen and specialty gas cylinders
• Food and beverage carbonation systems
• Scientific and laboratory gas containment
• High-purity and specialty gas handling

The standard ensures that welded stainless steel gas cylinders meet stringent international safety, reliability, and performance requirements. It supports regulatory compliance in line with the UN transportation of dangerous goods model regulations, making it essential for manufacturers, distributors, and users involved in the global gas supply chain.

Related Standards

For comprehensive gas cylinder compliance and interoperability, the following related ISO standards are often referenced alongside or within ISO 18172-1:2007:

• ISO 18172-2 - Gas cylinders - Refillable welded stainless steel cylinders - Part 2: Test pressure greater than 6 MPa
• ISO 3807 - Cylinders for acetylene service, including porous mass requirements
• ISO 9328-7 - Technical delivery conditions for steel flat products for pressure purposes (stainless steels)
• ISO 11114-1 - Compatibility of cylinder and valve materials with gas contents
• ISO 11117 - Valve protection caps and guards
• ISO 6506-1, ISO 6892, ISO 7438 - Testing methods for metallic materials
• ISO 13769 - Cylinder stamp marking requirements
• ISO 17636, ISO 17637 - Non-destructive testing of welds

By adhering to ISO 18172-1:2007 and related standards, stakeholders across the gas storage and distribution industry ensure product quality, enhance operational safety, and demonstrate compliance with internationally recognized best practices for welded stainless steel gas cylinders.