ISO 19973-1:2015

Overview

ISO 19973-1:2015 - "Pneumatic fluid power - Assessment of component reliability by testing - Part 1: General procedures" defines the general procedures, statistical calculation methods and reporting requirements for laboratory reliability testing of pneumatic fluid‑power components. The standard is component‑agnostic, provides general test conditions and data‑evaluation methods, and applies to the first failure without repairs. Outliers are excluded from core calculations but Annex F explains how to handle them because they can be significant.

Key topics and technical requirements

• Concept of reliability: reliability is the probability a component performs its required function over a given time, cycles or distance; relevant failures include catastrophic failures and threshold exceedances using a three‑point moving average (3PMA).
• Test planning and conditions: prescribed stress levels, duty cycles and environmental factors (pressure, temperature, contamination) are defined to create consistent and comparable results; tests may be adapted for specific applications while keeping prescribed data‑analysis rules.
• Statistical analysis: methods for evaluating life data, including Weibull parameters (η, β), B10 (time at which 10% of population is predicted to fail) and one‑sided confidence intervals for verifying minimum life at a specified reliability.
• Sample size & selection: guidance on number of test units, selection criteria and handling of censored data and suspended tests.
• End-of-test criteria: minimum number of failures, termination time/life, censored tests and suspended units are specified.
• Data handling: calculation procedures for censored data (Annex C & D), termination life determination (Annex A), threshold leakage procedures (Annex B), verification methods (Annex E), dealing with outliers (Annex F) and worked examples (Annex G).
• Reporting: standardized test report content and identification statements (Clause 12–13).

Applications and who uses it

ISO 19973-1:2015 is used by:

• Design and reliability engineers to quantify component lifetime and failure distributions.
• Test laboratories performing pneumatic component life tests and producing reproducible reports.
• Manufacturers and OEMs for product validation, service‑interval planning, spare‑parts provisioning and warranty analysis.
• Maintenance planners and procurement teams for comparing supplier reliability and setting maintenance policies.
• Standards committees and researchers for benchmarking and improving component designs.

Practical uses include modelling system reliability, establishing service intervals, optimizing spares inventory, and guiding design changes based on statistical test outcomes.

Related standards

• ISO 19973 series (Parts 2–5) - component‑specific test procedures (e.g., valves, cylinders, regulators).
• Normative references: ISO 3534‑1 (statistics), IEC 61649 (Weibull confidence limits), IEC 60300‑3‑5 (first failure concept).

Keywords: ISO 19973-1:2015, pneumatic fluid power reliability, component reliability testing, Weibull analysis, statistical evaluation, 3PMA, censored data, outliers, B10 life.