ISO 14695:2003

Overview

ISO 14695:2003 - "Industrial fans - Method of measurement of fan vibration" - defines a standardized procedure for measuring the vibrational behaviour of industrial fans (all types except simple air-circulation fans such as ceiling or table fans) installed with a power rating of less than 300 kW. The standard specifies how to record vibration as overall root-mean-square (r.m.s.) velocity, acceleration or displacement, or as a frequency spectrum, and covers common mounting arrangements including resilient bases and elastic-ropes. ISO 14695 gives measurement methods only; interpretation and acceptance criteria are handled in related documents (see Related standards).

Key topics and requirements

• Scope and exclusions: Applies to industrial fans <300 kW; larger fans are directed to ISO 10816-series methodologies. Oscillatory forces at mounting points are recognized as useful but are outside the scope.
• Measurement quantities: Overall r.m.s. velocity, acceleration or displacement, and spectral analysis within appropriate frequency ranges.
• Mounting and test rig: Procedures for resilient base mounting, fans suspended on elastic ropes, and stiff mounting; guidance to replicate in-service mounting conditions.
• Measuring equipment: Requirements and guidance for transducers, piezoelectric accelerometers, preamplifiers, analysers and calibration to ensure repeatable, comparable results.
• Transducer attachment and locations: Recommended attachment methods and measurement positions tailored for fan geometries and mounting types.
• Test conditions and procedure: Advice on test environment, operating data, measurement parameters, frequency analysis and presentation of results.
• Informative annexes: Practical tools and guidance including resilient mount calculations (Annex A), secondary/field measurement methods (Annex B), recommended machinery-health measuring positions (Annex C), and relationships between amplitude scales (Annexes D & E).

Practical applications and users

ISO 14695 is used to:

• Establish repeatable vibration test procedures during fan design and development.
• Provide consistent vibration data for factory acceptance tests and final inspection.
• Support in-situ testing and condition-monitoring programmes for rotating machinery.
• Inform foundation, ducting and support-structure designers about residual vibration transmitted by fans.

Primary users:

• Fan manufacturers and test laboratories
• Mechanical and rotational-dynamics engineers
• Maintenance and vibration analysts in HVAC, power generation, petrochemical and process industries
• OEMs and commissioning teams

Related standards

• ISO 14694 - specification for balance quality and vibration levels (interpretation/criteria)
• ISO 10816-1 / ISO 10816-3 - general machine vibration evaluation (for higher power fans)
• ISO 1940-1 - rotor balance quality
• IEC/ISO references for vibration instrumentation and acoustic band filtering

Keywords: ISO 14695, fan vibration measurement, industrial fans, vibration testing, resilient mounting, r.m.s. velocity, frequency spectrum, condition monitoring.