ISO 10225:2013

Overview

ISO 10225:2013 specifies a standardized gas letter code for marking equipment used in gas welding, cutting and allied processes when the full gas name or chemical symbol cannot be used. Published by ISO/TC 44 (Welding and allied processes), this concise standard ensures consistent, unambiguous identification of gases on torches, hoses, fittings and related gas-welding equipment to support safety, compatibility and traceability.

Key Topics and Requirements

• Scope: Applies to marking of gas welding, cutting and allied equipment when full gas names or chemical symbols are impractical.
• Primary requirement: Use the letter codes in Table 1 of ISO 10225:2013 for marking equipment instead of full names.
• Mandatory codes (selected from the standard):
  • Oxygen - O
  • Air - D
  • Nitrogen / inert gases - N
  • Carbon dioxide - B
  • Acetylene - A
  • Hydrogen - H
  • MPS - Y
  • Natural gas / methane - M
  • Propane / butane / LPG - P
  • Ethylene - E
  • Propylene - L
  • Coal gas / town gas - C
  • Other combustible gases or mixtures - F
• Special note on code F: If F is used for combustible gases or multi-gas compatibility, the manufacturer must supply instructions that specify the full gas names and detailed compatibility information.
• Traceability and safety: The code system reduces confusion in environments where space on equipment is limited or multilingual markings are required.

Applications

ISO 10225:2013 is practical for:

• Marking torches, torches heads, mixers, hoses, regulators and fittings used in gas welding and cutting.
• Manufacturers and OEMs creating compact labels where full names or chemical symbols won’t fit.
• Safety documentation and labeling programs in workshops, fabrication shops, and industrial plants.
• Procurement and inventory systems to standardize equipment identifiers across suppliers and international operations.

Who should use this standard

• Equipment manufacturers and designers of gas welding/cutting tools
• Safety officers, workshop managers and maintenance teams
• Suppliers, distributors and inspectors handling gas welding equipment
• Standards committees and regulatory bodies coordinating marking and safety guidance

Related Standards

• ISO 10225:2013 was prepared by ISO/TC 44/SC 8 (gas welding equipment). For broader context, consult other ISO welding and gas-handling standards and national regulations covering gas cylinders, fittings and workplace gas safety.

Keywords: ISO 10225:2013, gas welding equipment, marking, gas letter code, gas identification, welding and cutting, acetylene, oxygen, propane, safety labeling.