Overview
ISO 13293:2012 - "Recreational diving services - Requirements for gas blender training programmes" defines minimum requirements for training, assessment and certification of gas blenders who prepare breathing gases for recreational diving. The standard establishes two qualification levels (Level 1 and Level 2), recognizes modular programme delivery, and sets competency, instructor and qualification criteria used by training organisations and filling-station operators.
Key topics and technical requirements
- Two qualification levels
- Level 1 gas blender: authorised to blend enriched air nitrox (EAN).
- Level 2 gas blender: authorised to blend and supply broader mixes including helium-based mixtures (trimix, heliox).
- Theoretical knowledge required for each level:
- Gas properties (oxygen, nitrogen, helium, argon, air, EAN)
- Gas blending and delivery methods: membrane/molecular sieve (nitrogen reduction), continuous blending, partial-pressure blending, gravimetric (by weight), premixed gases, booster pumps
- Oxygen hazards and oxygen service principles: oxygen-clean, oxygen-compatible design, contamination avoidance, fire triangle risks
- Cylinder marking, valves, adapters, permissible regional colour coding and regulations
- Gas flow rates, analysers, record keeping, and blending calculations (manual, tables or software)
- Practical skills
- Calibrate and use oxygen (and for Level 2, helium) analysers
- Fill cylinders to specified tolerances: ±1% oxygen for EAN; Level 2 helium content within ±3%
- Complete cylinder labels/tags and filling-station logs
- Instructors and assessment
- Instructors must be certified to the level they teach and have practical mixing experience; Level 2 instructors can teach both levels
- Students must pass a knowledge exam and demonstrate practical skills; minimum age 18
- Training records and examination logs are required
Practical applications
- Ensures safe, standardised training for personnel who blend and supply diving gases at:
- Dive centres and filling stations
- Scuba training agencies and federations
- Liveaboard operators and resort dive shops
- Improves safety and consistency in gas analysis, cylinder handling, and filling procedures-reducing oxygen fire/explosion risks and human error in gas mixes.
Who should use this standard
- Diving training organisations and certification bodies
- Filling-station managers and gas-blending technicians
- Safety officers, auditors and regulators in recreational diving services
- Instructor trainers designing gas blender courses
Related standards
Keywords: ISO 13293, gas blender training, recreational diving, enriched air nitrox, trimix, helium, gas blending, oxygen service, gas analysis, filling station certification.
