ISO 23551-12:2023

Overview

ISO 23551-12:2023 defines safety, construction, performance and testing requirements for multifunctional controls with integral overpressure protection safety function (OPSF) intended for use with butane gas cartridges in portable gas appliances. The standard applies to controls that combine a pressure-limiting device with one or more control functions (for example, a manual gas valve, pressure regulator and/or thermoelectric flame supervision device) and with declared maximum operating pressures in normal use up to 500 kPa for use with butane cartridges specified by ISO/TS 21985. Note: ISO 23551-12 covers type testing only and does not apply to multifunctional controls that have threaded connections for mounting butane cartridges.

Key Topics and Requirements

ISO 23551-12 sets out technical requirements and test methods to ensure safe, reliable operation of multifunctional gas controls. Major topics include:

• Construction and materials
  • Enclosure, moving parts, seals, springs, housings, corrosion resistance and surface protection.
• Functional elements
  • Pressure-limiting device (OPSF), manual gas valves, pressure regulators and thermoelectric flame supervision devices.
• Performance and safety testing
  • Leak-tightness (volumetric and pressure-loss methods)
  • Rated flow rate and flow performance
  • Durability and endurance testing
  • Mechanical tests: torsion, bending, vibration
  • Environmental tests: cold resistance, heat resistance, thermal shock
  • Corrosion resistance and post-corrosion OPSF operation
• Electrical and EMC requirements
  • Provisions when electrical components are in the gas path and electromagnetic compatibility.
• Marking and documentation
  • Required markings, installation and operating instructions, and warning notices.
• Type testing scope
  • This part is explicit about type tests and test conditions/tolerances.

Practical Applications and Who Uses It

ISO 23551-12 is directly useful to:

• Manufacturers of portable gas appliances and multifunctional gas controls aiming to design and certify OPSF-equipped devices.
• Product designers and safety engineers defining materials, assemblies and performance targets.
• Testing laboratories and conformity assessment bodies performing type testing and issuing compliance reports.
• Regulators and specifiers setting procurement or regulatory safety requirements for portable butane-fuelled appliances.
• OEMs and importers seeking market access and demonstrating compliance with international safety practices.

Adopting ISO 23551-12 helps ensure safe operation, reduce overpressure risks, and support consistent type-testing for portable gas appliances using butane cartridges.

Related Standards

• ISO/TS 21985 - specification for butane gas cartridges referenced by this part.
• Other parts of the ISO 23551 series covering safety and control devices for gas burners and appliances (see ISO catalogue for related part numbers).