ISO 6358-1-2013 PDF

Full title and description

ISO 6358-1:2013 — Pneumatic fluid power — Determination of flow-rate characteristics of components using compressible fluids — Part 1: General rules and test methods for steady-state flow. This part specifies a steady-state method for testing pneumatic components that use gases, defining test installation, test procedures and presentation of results; it excludes components with unstable flow coefficients (marked hysteresis or internal feedback) and components that exchange energy with the fluid (e.g. cylinders, accumulators).

Abstract

ISO 6358-1:2013 provides general rules and standardized test methods to determine flow-rate characteristics of components with internal flow paths (fixed or variable) when using compressible fluids under steady-state conditions. The standard defines required test circuits (constant and variable upstream pressure), measurement and calibration requirements, presentation formats for results and limits on allowable variations during measurement. It excludes devices whose flow coefficients are unstable in use or that exchange energy with the fluid.

General information

• Status: Published; version confirmed and remains current following ISO review.
• Publication date: May 2013 (edition 1, 2013-05).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 23.100.01 (Fluid power systems in general).
• Edition / version: Edition 1 (2013). Amended: Amendment 1 published 2020 (effective conductance); further draft amendment addressing measurement uncertainty has been processed.
• Number of pages: 61 pages.

Scope

This part of ISO 6358 specifies steady-state test methods for determining flow-rate characteristics of pneumatic components using compressible fluids (air or other gases). It covers test installations (including recommended circuits for constant and variable upstream pressure), instrumentation, test procedures, calculation of characteristics (including conductance, sonic/subsonic behavior and choked flow), calibration and presentation of results. It does not apply to components with unstable flow coefficients (strong hysteresis or internal feedback) or to components that exchange energy with the fluid during measurement (for example cylinders or accumulators).

Key topics and requirements

• Definitions, symbols and units for pressures, temperatures and flow quantities (reference conditions and ANR conventions).
• Test installations and two principal test circuits: constant upstream pressure and variable upstream pressure (including pressure‑measuring tube arrangements and transition connector requirements).
• Measurement and calibration requirements for flowmeters, pressure and temperature instruments; allowed test-condition variations and measurement accuracy limits.
• Calculation and presentation of flow-rate characteristics: conductance, sonic (choked) flow parameters, subsonic index and pressure-dependence coefficients.
• Requirements for reporting results, identification statements and traceability; guidance on filtration/conditioning of test gas and safety considerations for test circuits.
• Normative/annex material: includes an alternative test procedure (Annex A) and guidance on flowmeter calibration and related calculations.

Typical use and users

Used by pneumatic component manufacturers, test laboratories, R&D and product engineering teams to determine and verify catalogue flow data for valves, fittings, restrictors, silencers and other pneumatic control components. Also used by quality assurance, certification bodies and system designers who require standardized, traceable flow-rate data for system modeling and component selection.

Related standards

ISO 6358 is a multipart series: Part 2 covers alternative test methods and Part 3 (method for calculating steady-state flow-rate characteristics of assemblies) has been prepared/advanced in parallel. ISO 6358-1 references other ISO documents for symbols and reference atmosphere, for example ISO 1219-1 (graphical symbols) and standards that define reference conditions. Users often consult ISO 6358-2 and the published amendments to Part 1 when applying these methods.

Keywords

pneumatic fluid power; flow-rate characteristics; compressible fluids; steady-state flow; conductance; choked/sonic flow; test methods; calibration; measurement uncertainty; ISO 6358.

FAQ

Q: What is this standard?

A: ISO 6358-1:2013 is Part 1 of the ISO 6358 series that defines general rules and steady-state test methods to determine flow-rate characteristics of pneumatic components using compressible fluids.

Q: What does it cover?

A: It covers test installation requirements, prescribed test circuits (constant and variable upstream pressure), measurement and calibration requirements, calculation methods (conductance, sonic/subsonic behavior) and presentation/reporting of results for steady-state tests. It excludes devices with unstable flow coefficients and energy-exchanging components.

Q: Who typically uses it?

A: Component manufacturers, independent test laboratories, R&D and product engineers, quality and certification organizations, and system designers who need standardized flow-rate data for pneumatic components.

Q: Is it current or superseded?

A: The 2013 edition (Edition 1) is published and was reviewed/confirmed in a subsequent ISO review; the document remains current. Amendment 1 (2020) has been issued; further amendment activity addressing measurement uncertainty has been progressed in draft form. Users should check the latest amendment status before relying on specific test or uncertainty methods.

Q: Is it part of a series?

A: Yes — ISO 6358 is a multipart series. Part 1 is the general rules and steady-state methods; Part 2 covers alternative test methods; Part 3 (calculation methods for assemblies) has been prepared/advanced in connection with the series.

Q: What are the key keywords?

A: Pneumatic fluid power, flow-rate characteristics, compressible fluids, steady-state, conductance, choked flow, test methods, calibration, measurement uncertainty.