Overview - EN ISO 9902-4:2001 (Textile machinery, noise test code)
EN ISO 9902-4:2001 is the CEN-adopted European version of ISO 9902-4:2001, part of the ISO 9902 series for textile machinery. It complements Part 1 (common requirements) and specifies the mounting, operating and measuring conditions required for the measurement, declaration and verification of noise emitted by yarn processing, cordage and rope manufacturing machinery. The standard is intended to ensure consistent, reproducible noise measurement and reporting for this category of textile machines.
Key topics and technical requirements
- Scope and applicability
- Targets yarn processing equipment such as doubling, twisting, texturing, reeling, winding and ball-winding machines, and cordage/rope manufacturing machines.
- Complements the general rules in ISO 9902‑1.
- Measurement conditions
- Specifies required mounting, operating (running) and measuring conditions for noise tests to ensure repeatability.
- Measurement grades
- Applies to engineering methods (grade 2) and survey methods (grade 3) as defined in the referenced acoustics standards.
- Noise declaration and verification
- Provides the framework for measurement, declaration and verification of machine noise so manufacturers and testing bodies can produce comparable sound data.
- Normative references
Applications - who uses EN ISO 9902-4 and why
- Machine manufacturers use the standard to quantify and declare noise emissions for yarn processing and rope-making equipment.
- Independent test laboratories and acoustic consultants follow the specified mounting and measuring conditions to produce repeatable, comparable test results.
- Compliance and safety engineers rely on the standard to demonstrate conformity with machine-safety and noise-related requirements (it supports the EU Machinery Directive 98/37/EC).
- Procurement specialists and end users use declared noise data for risk assessment, workplace planning and hearing-conservation measures.
Related standards and context
- Part of the ISO 9902 series (Parts 1–7) covering textile machinery noise test codes.
- Normative references include ISO acoustics standards for sound power and emission measurement: ISO 3743‑1, ISO 3744, ISO 3746, ISO 3747, ISO 9614‑1/2, ISO 11201–11204, and safety standard ISO 11111.
- Adopted by CEN and listed in Annex ZB as supporting EU Machinery Directive requirements.
This standard is essential for consistent noise measurement, declaration of machine sound levels, and regulatory compliance in the textile machinery sector - particularly for yarn processing, cordage and rope manufacturing equipment.
