ISO 23555-1:2022

Overview

ISO 23555-1:2022 - "Gas pressure safety and control devices for use in gas transmission, distribution and installations for inlet pressures up to and including 10 MPa - Part 1: General requirements" defines generic safety, constructional, performance, testing and documentation requirements for high‑pressure gas controls. It applies to controls with operating pressures > 500 kPa (5 bar) and ≤ 10 MPa (100 bar) and nominal sizes up to DN 400, intended for fuel gases such as natural gas, manufactured gas, biomethane and LPG in commercial, industrial and fuel‑gas infrastructure applications. Test methods cover product type tests, routine tests and batch surveillance.

Key topics and technical requirements

• Scope and exclusions: Excludes controls for domestic gas appliances downstream of domestic meters, small-capacity service‑line controls (≤ 200 m3/h and ≤ 500 kPa), industrial process control valves (e.g., IEC 60534), equipment for sour/aggressive or severely corrosive gas environments, and renewable/waste gas mixtures (e.g., H2 blends > 10%) unless supplemental data are provided.
• Classification: Temperature classes, strength types and nominal sizes for selection and conformity assessment.
• Materials: Requirements and validation for metallic and non‑metallic materials, material inspection documentation, and non‑destructive testing for steel bodies.
• Design and strength: Design approach, hazard identification, end connections, flange ratings, face‑to‑face dimensions, sealing, safety factors, springs, diaphragms and welding requirements.
• Performance & testing: Test rig specifications, shell strength, internal/external tightness, antistatic properties, sound emission, corrosion resistance, and stable production test regimes.
• Quality control & documentation: Type test reports, batch surveillance documentation, routine test records, marking, packaging and transport requirements.

Practical applications and users

Who uses ISO 23555-1:2022:

• Manufacturers and designers of pressure controls and safety devices for gas transmission and distribution
• Testing laboratories and certification bodies performing type testing, routine testing and batch surveillance
• Gas utilities, EPC contractors and system integrators specifying compliant devices for commercial and industrial installations
• Procurement, compliance and regulatory teams ensuring products meet safety and documentation requirements

Practical benefits:

• Ensures consistent safety and performance of high‑pressure gas controls
• Provides a baseline for product development, conformity assessment and procurement
• Supports safer integration into gas transmission and distribution networks

Related standards

• This is Part 1 (General requirements) - other parts may specify device‑specific requirements and test methods.
• Cross‑references include standards for industrial control valves (e.g., IEC 60534) and material/manufacturing standards commonly cited for pressure equipment.

Keywords: ISO 23555-1:2022, gas pressure safety and control devices, high pressure controls, gas transmission, gas distribution, DN 400, natural gas, biomethane, LPG, testing, type test, batch surveillance, materials, design, certification.