The company carried out the operation using the vessel Esmeralda, eliminating the need for AHTS vessels, which are traditionally used in this type of project
Seagems, a Brazilian company specializing in subsea engineering solutions, has just completed a groundbreaking project involving the installation of four torpedo piles in the Mero 3 field, located in the Santos Basin. The operation, contracted by Subsea7, was carried out entirely using the Esmeralda, a Pipe Laying Support Vessel (PLSV).
Traditionally, this type of operation is executed by Anchor Handling Tug Supply Vessels (AHTS), which are used for towing, anchor handling, and supply transport. In an innovative approach, Seagems used a PLSV to perform the entire task, showcasing the potential to expand the applications of this type of vessel beyond its conventional uses.
The operation was carried out by Esmeralda, the smallest vessel in Seagems‘ fleet, which added further significance to the project. „The Esmeralda is equipped with two independent deployment systems, one vertical and one horizontal. While this versatility is advantageous for pipeline installation, it presents challenges for handling torpedo piles due to limited deck space. We overcame these limitations through precise engineering, delivering a more efficient and cost-effective solution for our clients. In operations like this, we eliminate the need to hire both an AHTS vessel and a PLSV, enabling the entire project to be executed with a single vessel,” explains Jadyr Peres, Operations Engineer at Seagems.
Importance of Torpedo Pile Installation
According to expert John Brooke (2003), there is a 63% chance of a rogue wave occurring every 100 years—a phenomenon known as a “100-year wave.” This risk is taken into account in offshore engineering projects, as such waves can significantly impact the stability of installations.
To ensure the safety, stability, and integrity of subsea pipelines, torpedo pile systems are commonly used. These massive structures are designed to anchor large equipment to the seabed, minimizing movement caused by strong currents throughout their operational life.
The installation process involves the controlled descent of the torpedo pile to a specific depth above the seafloor. The pile is then released in free fall, reaching high speed before penetrating the seabed. A Remotely Operated Vehicle (ROV) is subsequently used to connect chains and mooring lines to the piles, securing the system in place.
This procedure is typically carried out using two dedicated anchor handling vessels working together—and in some cases, even a third vessel may be involved.
“The successful execution of this operation using a PLSV reinforces Seagems‘ commitment to innovation and the pursuit of new installation methodologies. In addition to expanding the capabilities of flexible pipe-laying vessels, we are opening a new frontier in torpedo pile installation, bringing increased efficiency and cost optimization to the offshore market,” concludes Jadyr Peres