ISO 18434-1:2008

Overview

ISO 18434-1:2008 - "Condition monitoring and diagnostics of machines - Thermography - Part 1: General procedures" provides guidance on using infrared thermography (IRT) for machine condition monitoring and diagnostics. The standard covers machinery and machine auxiliaries (for example valves, fluid- and electrically-powered machines, and heat-exchanger related equipment) and addresses IRT applications for machine performance assessment, anomaly detection and severity evaluation.

Key topics and requirements

• Terminology and scope: Introduces IRT terms as they apply to machine condition monitoring and diagnostics.
• IRT procedure types and merits: Describes different thermography approaches and guidance to select appropriate methods for specific inspection goals.
• Measurement accuracy: Procedures for determining and compensating for reflected apparent temperature, emissivity, and attenuating media when measuring surface temperature with quantitative IRT cameras.
• Data interpretation and assessment criteria: Guidance on interpreting thermal images, establishing severity assessment criteria for identified anomalies, and how to prioritize findings.
• Operational requirements and safety: Outlines practical steps and safety recommendations for conducting thermographic surveys of machinery.
• Reporting: Defines required information and best practices for clear, consistent thermography reporting to support maintenance decisions.

Applications

ISO 18434-1:2008 is practical for organizations and professionals using thermography to detect faults, prevent failures, and optimize maintenance:

• Preventive and predictive maintenance programs - scheduled thermographic surveys to detect developing issues (bearing overheating, electrical hotspots, fluid flow anomalies).
• Diagnostic investigations - root-cause analysis when abnormal thermal patterns are found.
• Performance assessment - assessing heat-exchanger effectiveness, insulation integrity, or thermal balance in machine systems.
• Inspection and compliance reporting - standardized reporting for asset managers, reliability engineers, and maintenance contractors.

Who should use this standard

• Reliability and maintenance engineers
• Condition monitoring specialists and thermographers
• Plant managers and asset owners
• Inspection and testing service providers
• Safety officers and quality assurance teams

Related standards

ISO 18434-1:2008 is the general-procedures part of the thermography guidance for machine condition monitoring. It is intended to be used alongside other industry standards and guidance on condition monitoring, thermographic practice, instrumentation, and personnel competence to form a complete thermography-based inspection program.

Keywords: ISO 18434-1:2008, thermography, infrared thermography, IRT, condition monitoring, diagnostics of machines, emissivity, reflected apparent temperature, severity assessment, machine inspection.