ISO 5145-2017 PDF

Full title and description

Gas cylinders — Cylinder valve outlets for gases and gas mixtures — Selection and dimensioning (ISO 5145:2017). The standard provides criteria and dimensional specifications to select appropriate valve outlet connections for a wide range of gases and gas mixtures used with transportable gas cylinders.

Abstract

ISO 5145:2017 establishes practical criteria for determining valve outlet connections for gas cylinders and specifies dimensions for a number of standard outlet connections. It gives guidance to ensure correct matching of cylinder valves and equipment in order to reduce the risk of incorrect gas connections. The document explicitly excludes connections used for cryogenic gas withdrawal and for gases intended for breathing apparatus.

General information

• Status: Published (current international standard).
• Publication date: 28 November 2017.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 23.020.35 (Gas cylinders).
• Edition / version: Edition 4 (2017).
• Number of pages: 27.

Scope

Specifies practical criteria for selecting cylinder valve outlet connections and gives dimensions for many standard outlet types. Applies to valve outlet selection for transportable gas cylinders conveying compressed, liquefied or dissolved gases. Does not apply to cryogenic withdrawal connections or connections intended for breathing equipment; other ISO standards cover those areas.

Key topics and requirements

• Criteria for selection of appropriate valve outlet connections for specific gases and gas mixtures.
• Dimensional specifications and tolerances for a range of standard outlet connection types (threads, fittings, mating dimensions).
• Tables and identification of commonly used outlet types to reduce cross-connection risk.
• Guidance on compatibility between cylinder valve outlets and downstream equipment.
• Exclusions and cross-references to standards covering cryogenic valves, breathing apparatus connections and specialized valves.

Typical use and users

Used by cylinder manufacturers, valve and fitting designers, gas suppliers, laboratories, welding and industrial gas users, equipment specifiers, safety and compliance officers, and standards committees to ensure correct and safe selection of valve outlets and to avoid incompatible connections in gas systems.

Related standards

Relevant complementary and referenced standards include ISO 10297 (cylinder valves — specification and type testing), the ISO 11119 series (design and testing of composite gas cylinders), the ISO 9809 series (refillable seamless steel gas cylinders), and standards on valves with integrated pressure regulators (e.g., ISO 22435) and other valve-related documents (ISO 15996, ISO 4126, ISO 21011). These documents define valve construction, testing, cylinder design and special-purpose valve requirements that work together with ISO 5145 guidance.

Keywords

gas cylinders, cylinder valve outlets, outlet connections, valve selection, dimensioning, cylinder fittings, gas safety, ISO 5145, valve compatibility

FAQ

Q: What is this standard?

A: ISO 5145:2017 is an International Standard that gives criteria and dimensional data for selecting cylinder valve outlet connections for gases and gas mixtures used with transportable gas cylinders.

Q: What does it cover?

A: It covers practical selection rules and dimensional specifications for many common cylinder valve outlet types to help prevent incorrect connections; it excludes cryogenic withdrawal connections and breathing-applications which are addressed by other standards.

Q: Who typically uses it?

A: Cylinder manufacturers, valve and fitting designers, gas suppliers, equipment manufacturers, laboratories, and safety/compliance personnel use it when specifying, manufacturing or procuring cylinder valve outlets and compatible equipment.

Q: Is it current or superseded?

A: ISO 5145:2017 is the current published edition (edition 4, published 28 November 2017), which replaced the 2014 edition. Users should check national adoption and any subsequent ISO confirmation or revisions before assuming future changes.

Q: Is it part of a series?

A: It is part of the body of ISO work on gas cylinders and fittings managed by ISO/TC 58. It is used alongside other standards on cylinder valves, cylinder design and valve testing (for example ISO 10297, the ISO 11119 and ISO 9809 series, and standards for VIPRs and special valves).

Q: What are the key keywords?

A: Gas cylinders, valve outlets, outlet connections, selection, dimensioning, cylinder fittings, valve compatibility, ISO 5145.