ISO 11363-1:2018/Amd 1:2023

Overview

ISO 11363-1:2018/Amd 1:2023 is the latest amendment to the international standard specifying 17E and 25E taper threads used for connecting valves to gas cylinders. Developed by ISO Technical Committee ISO/TC 58, this standard ensures consistency, safety, and interoperability in the gas industry by defining precise thread specifications for cylinder valve connections. The amendment updates key dimensional data, enhancing the technical clarity and application accuracy for manufacturers, suppliers, and quality controllers involved in gas cylinder production and maintenance.

Key Topics

• Thread Types: Focuses on 17E and 25E taper threads, which are critical for secure and leak-proof valve connections on gas cylinders.
• Specifications Update: Amends previous dimensions, notably in Table 4, which details cylinder neck thread parameters for 25E, including major, pitch, and minor diameters along with thread length measurements.
• Dimension Standards:
  • Major, pitch, and minor diameters precisely defined to ensure compatibility.
  • Reference length of full thread established to guarantee reliable valve attachment.
• International Collaboration: Prepared jointly with the European Committee for Standardization (CEN), showcasing global harmonization of transportable gas cylinder fittings.
• Patent and Copyright Notice: ISO clarifies the potential existence of patents related to this standard without guaranteeing their applicability or coverage.

Applications

• Gas Cylinder Manufacturing: Ensures that cylinder neck threads conform to globally recognized measurements, facilitating valve compatibility and safety during gas storage and transportation.
• Valve and Cylinder Fitting: Manufacturers and maintenance providers use the standard to verify that valves fit securely and meet pressure containment requirements.
• Quality Control: Enables inspectors and regulatory bodies to check threading precision, reducing risks of gas leakage or mechanical failure.
• International Trade: Harmonization of threading standards simplifies import/export processes and supports compliance with worldwide safety regulations.
• Safety Compliance: Critical for industries using compressed gases-such as medical, industrial, and firefighting sectors-where valve integrity is paramount.

Related Standards

• ISO 11363 Series: Other parts of the series expand on cylinder fittings and threads, providing a comprehensive framework for different types of gas cylinder connections.
• ISO/TC 58 Standards: Additional standards under the ISO Technical Committee 58 cover various aspects of gas cylinder construction, testing, and safety requirements.
• CEN/TC 23: European standards related to transportable gas cylinders that complement ISO standards for regional applicability.
• ISO/IEC Directives: Documents guiding the preparation and maintenance of ISO standards, ensuring uniform editorial and technical consistency.

Implementing ISO 11363-1:2018/Amd 1:2023 provides the gas cylinder industry with critical guidance on thread design and quality requirements for 17E and 25E taper threads, ensuring valve connections are safe, reliable, and standardized internationally. For manufacturers, regulators, and end-users, adherence enhances equipment compatibility and operational safety across diverse gas applications. Visit ISO’s official website for detailed information and to access the full documentation.