Overview
ISO 15245-2:2001 specifies the types, dimensions, and principles of use for inspection gauges designed to check parallel threads used in connecting valves to gas cylinders. This international standard plays a significant role in the gas cylinder industry by defining the essential criteria for gauge inspection, which ensures the reliability and safety of threaded connections between valves and cylinders. Accurate gauging is critical for verifying compliance with specifications and maintaining the quality and interchangeability of gas cylinder components.
Key Topics
- Gauge Types: The standard covers several inspection gauges including recess depth plug gauges, recess diameter plug gauges, and thread relief plug gauges, designed for verifying specific geometric aspects of parallel threads.
- Go and Not Go Plug Gauges: Defines the use of GO gauges (to verify the component is within dimensional tolerance) and NOT GO gauges (to confirm the component is not exceeding tolerance limits).
- Dimensional Requirements: Specifies detailed dimensions for each type of gauge as related to common thread sizes (e.g., M18, M25, M30), referencing ISO 68-1 and ISO 724 for basic thread profiles and measurements.
- Inspection Procedure: Outlines proper gauge usage to assess thread and recess features without applying excessive force, ensuring correct fit and integrity of the gas cylinder valve connection.
- Verification and Maintenance: Emphasizes regular examination and verification of gauges, using appropriate measuring technology, to ensure ongoing accuracy and compliance.
- Identification: Establishes marking requirements for inspection gauges for traceability and proper usage.
Applications
ISO 15245-2:2001 is essential for:
- Manufacturers of Gas Cylinders and Valves: Ensures that connection threads meet international safety and compatibility standards.
- Inspection and Testing Laboratories: Provides procedures for using inspection gauges to verify gas cylinder valve connections, increasing confidence in product safety.
- Regulatory Compliance: Supports organizations in demonstrating adherence to international standards for threaded connections in pressure vessels, which is often a legal or contractual requirement.
- Quality Control: Enables systematic checking during manufacturing or routine maintenance, minimizing thread compatibility issues and potential failures.
- Cylinder Maintenance and Requalification: Facilitates ongoing safety checks and life-extension activities for in-service gas cylinders.
Using ISO 15245-2:2001 helps organizations increase safety, reduce liability, and streamline international trade by supporting the global interchangeability of gas cylinder fittings.
Related Standards
- ISO 15245-1: Gas cylinders - Parallel threads for connection of valves to gas cylinders - Part 1: Specification. Contains core specifications for the threads themselves.
- ISO 68-1: Basic profile for metric screw threads, referenced for defining thread geometry.
- ISO 724: Specifies the basic dimensions of general-purpose metric screw threads.
- ISO 1502: Details gauges and gauging for general-purpose metric screw threads, providing the foundation for the GO and NOT GO gauge concepts included in ISO 15245-2.
Practical Value
Implementing ISO 15245-2:2001 safeguards the functional performance of gas cylinders by:
- Ensuring precise dimensional control at the critical interface between valves and cylinders
- Reducing rejection rates and costly incidents stemming from improper thread fit
- Facilitating efficient, standardized inspection processes within global manufacturing and maintenance operations
This standard underpins quality, reliability, and safety throughout the gas cylinder supply chain, making it indispensable for stakeholders in the compressed gas industry.
Open preview (PDF)Gas cylinders — Parallel threads for connection of valves to gas cylinders — Part 2: Gauge inspection