Advancing subsea noise mitigation in offshore pile driving

Environmental protection has become a fundamental part of offshore construction. As global regulations tighten regarding underwater sound levels, balancing operational efficiency with marine life preservation is essential. Noise generated during impact piling can reach levels that are harmful to marine mammals, making effective mitigation a legal and ecological requirement.

Providing physical sound insulation with IQIP noise mitigation systems 

The IQIP noise mitigation system (NRS) serves as a physical barrier between piling activities and the surrounding water. This insulated, telescopic sleeve is deployed around the pile and the hammer to block the spread of acoustic energy.

• Telescopic design: Provides continuous protection from the splash zone down to the seabed.

• Broad-spectrum attenuation: Delivers significant noise reduction across various frequencies.

• Integrated efficiency: Being part of the handling equipment, the system minimizes the impact on overall installation cycle times.

Reducing acoustic energy at the source with pulse technology 

Addressing noise at the source is a highly effective method of control. Pulse technology is a damping system positioned between the hammer ram and the anvil. By using liquid layers to prolong the blow duration of the hammer, the system reduces the peak sound pressure level. This results in a significant decrease in underwater noise while maintaining the necessary driving force required to reach target penetration depths.

Meeting environmental standards through integrated technical solutions 

Complying with international standards, such as the German BSH guidelines, often requires a multi-layered approach. Integrating systems like NRS and pulse allows projects to meet strict requirements for both sound exposure level (SEL) and peak sound pressure level (SPL). This integrated approach can often reduce or eliminate the need for secondary mitigation measures, such as large-scale bubble curtains.

Optimizing offshore logistics 

A holistic approach to noise mitigation systems offers more than just environmental benefits. It reduces logistical complexity by decreasing the amount of additional subsea equipment required for sound protection. This optimizes vessel usage and lowers the total cost of foundation installation while ensuring offshore wind farms are built with respect for the marine environment.