NA 001

DIN/VDI Standards Committee Acoustics, Noise Control and Vibration Engineering


Acoustics - Acoustic insulation for pipes,valves and flanges


This document defines the acoustic performance of four classes (Classes A, B, C and D) of pipe insulation. It also defines a standardized test method for measuring the acoustic performance of any type of material system construction, thereby allowing existing and new insulation constructions to be rated against the four classes. Furthermore, this document presents some typical types of construction that would be expected to meet these acoustic performance classes. This document is applicable to the acoustic insulation of cylindrical steel pipes and to their piping components. It is valid for pipes up to 1 m in diameter and a minimum wall thickness of 4,2 mm for diameters below 300 mm, and 6,3 mm for diameters from 300 mm and above. It is not applicable to the acoustic insulation of rectangular ducting and vessels or machinery. This document covers both design and installation aspects of acoustic insulation and provides guidance to assist noise control engineers in determining the required class and extent of insulation needed for a particular application. It gives typical examples of construction methods, but the examples are for information only and not meant to be prescriptive. This document emphasises the aspects of acoustic insulation that are different from those of thermal insulation, serving to guide both the installer and the noise control engineer. Details of thermal insulation are beyond the scope of this document.



Planned document number

DIN ISO 15665

Project number


Responsible national committee

NA 001-02-03 AA - Sound propagation, noise control and noise reduction  

Responsible international committee

ISO/TC 43/SC 1/WG 66 - Revision of ISO 15665 Acoustic insulation of pipes, valves and flanges  

previous edition(s)

Acoustics - Acoustic insulation for pipes,valves and flanges (ISO 15665:2003 + Cor. 1:2004)

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