Acoustic Tube Mounts (ATM)

The Acoustic Tube Mounts or ATM are used to isolate construction sound and vibrations in pipelines. Vibrations and construction sound from machinery propagate in the outgoing pipelines of machinery (diesels, pumps, etc.) despite the use of rubber bellows or tubes. The transfer of vibrations and sound takes place through the liquid in the pipeline and through the wall of the bellow or tube. Pipelines can greatly reduce or completely negate the effectiveness of a good spring-loaded setup. Rubber bellows and tubes often do not work properly, because the pipeline on both sides of the bellow or tube is insufficiently rigid (in all directions). This can be solved by creating rigid foundations, but this is very expensive. ATMs are mainly used for hydraulic lines, pipelines in which cavitation can occur and pipelines which have high vibration levels due to pressure pulsations in the pipeline.

Why Sebert Acoustic Tube Mounts

The gain that can be achieved in airborne noise levels (in the accommodation of a ship) for low frequency (around approx. 100Hz) is 10dB and for higher frequency (around 500Hz) 25-40dB or even more, depending on the construction. The ATMs can be supplied in various shapes. The standard shape is square. This can also be used in standard pipe brackets (round) with a somewhat larger diameter than would normally be used for the pipeline.  In consultation, different options are possible.

Numbers achieved depend on the course of the pipeline and the position of the pipeline in relation to the ship's construction. Sebert advises on the best layout (location of the ATMs) and the attachment to the ship's construction. ATMs can also be used on the machinery itself, which could further reduce the vibrations within the ship.

Specific characteristics

  • A few models cover a wide range of pipeline sizes
  • Optimal attenuation of structure transmitted sound and vibrations
  • Proven effectiveness of design
  • No additional assembly parts required
  • Product meets all known shock requirements
  • Minimal installation procedures
  • Materials are non-magnetic
  • Oil, grease, and solvent resistant polymer
  • Resistant to high temperatures
  • The above-mentioned advantages save on the costs for parts and logistics.


Example:

Based on construction sound measurements on machinery, a noise prognosis has been made for dormitory areas on board, located directly above an auxiliary engine room.

In the graph, the top line is the construction noise level of previous measurements. The line below is the construction noise level achieved by Sebert using ATMs (10-20 dB lower). The third line is the calculated airborne noise level (total 62 dBA 20μPa), and the bottom line is the achieved airborne noise level (45-48 dBA). This is a gain of approx. 16 dB!!!  Simply put it is 5 times quieter.