ISO 23550:2018

Overview

ISO 23550:2018 - Safety and control devices for gas and/or oil burners and appliances - sets the general requirements for the construction, performance and type testing of controls used with gas burners and gas-burning appliances. It applies to devices for use with natural gas, manufactured gas and liquefied petroleum gas (LPG) at maximum operating pressures up to and including 500 kPa. The standard covers Gas Quick Connectors (GQC) for in-appliance connections up to DN 25 and 100 kPa. ISO 23550:2018 defines the baseline requirements that underpin the more specific control standards in the ISO 23551 and ISO 23552 series.

Key topics and technical requirements

ISO 23550:2018 addresses wide-ranging technical subjects important for design, testing and certification:

• Scope and classification of controls (classes, groups, DC supply types, function classes)
• Construction requirements: housing, materials, seals, moving parts, breather/vent holes, fastenings and serviceability
• Connections and fittings: threaded, union, flange, compression, flare and GQC connections (tube-to-tube, tube-to-control, tube-to-fitting)
• Performance tests: leak-tightness, rated flow rate, torsion and bending, durability, endurance and vibration
• Functional and safety requirements for gas controls (including valves, flame supervision, pressure regulators, thermostats and valve-proving systems)
• Electrical and EMC requirements for controls with electrical components (electrical safety, protection by enclosure, EMC immunity and emissions)
• Material and environmental resistance: corrosion protection, elastomer compatibility, humidity and marking resistance
• Type testing only: ISO 23550 covers type testing rather than production or routine testing procedures

Applications

ISO 23550:2018 is used to:

• Support design and development of gas safety and control devices (automatic/semi-automatic gas valves, gas pressure regulators, thermoelectric flame supervision, multifunctional controls, air/gas pressure sensors, vent valves, valve-proving systems)
• Define type testing requirements for product compliance and certification
• Guide manufacturers on construction, materials and connection specifications including Gas Quick Connectors (GQC)
• Inform conformity assessment bodies, testing laboratories and regulatory authorities evaluating safety and performance

Who should use this standard

• Manufacturers and designers of gas burner controls and appliance components
• Certification bodies and testing laboratories performing type tests
• Product safety engineers, compliance managers and procurement/specification teams in HVAC, appliance and industrial gas burner sectors
• Regulatory authorities and technical committees developing national/regional rules

Related standards

• ISO 23551 series (specific control standards)
• ISO 23552 series (specific control standards)

Keywords: ISO 23550:2018, safety and control devices, gas burners, gas appliances, gas controls, LPG, gas pressure regulators, Gas Quick Connectors, type testing, construction requirements, EMC.