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Low noise underwater piling trial proves potential

Marine consultancy W3G Marine has announced that it has successfully developed an underwater piling technique to significantly reduce noise levels.

Working with renewable energy developer Vattenfall and offshore construction specialist Geosea, the trials achieved an underwater noise reduction of 25dB in SEL (Sound Exposure Level) and 35dB in peak pressure using its patented Hydro NAS system.

The trial was conducted during the installation of a 5m diameter monopile with no energy restriction using an S1200 hammer.

W3G has said that the result confirms numerical modelling conducted by the Institute of Sound and Vibration Research at Southampton University and follows three other successful scale trials and four years of development work.

The company has said the test proves that the Hydro NAS system is a cost effective solution for piling noise mitigation. W3G has said that it is now planning a full offshore trial of the system.

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