SEA - Offshore Technology | Oil and Gas News and Market Analysis
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Underwater Trenching Machines

Via Mariani 44-46,
48121 – Ravenna (RA),

SEA provides installation and trenching services for pipes, electrical power cables and fibre optic cables in an underwater environment.

Our capabilities include the burial of sea lines (3in to 50in); pre or post-trenching of shore approaches; laying and burying of power and fibre optic cables; river crossings; and small diameter pipeline installation and assembly.

Post-trenching machines for pipeline works

SEA is the world leader in post-trenching activities because it avails from the experience of Franco Ballestri, who was the first to introduce the system in Italy.

Since 1974 almost all AGIP pipelines in the Adriatic sea have been buried by post-trenching machines (PTMs) invented by Mr. Ballestri, and the company has carried out numerous projects for various multinational corporations, such as Petrobras, McDermott, Techint, ANCAP, Acergy and Global Industries, to name a few.

Trenching of pipelines and cables

The PTMs can operate from very shallow waters (in shore approaches) up to 100m water depth. The company distinguishes itself from others as its machines can also trench through rock.

The PTMs designed for trenching pipelines include: Speedy PTM; Jolly PTM; Piper PTM; Combo PTM; Dual PTM; and Leo PTM.

The equipment designed for trenching cables includes: MAC 1, MAC 2 and MACRO.

SEA oversees and supervises the construction of its PTMs. The extreme versatility to adapt to project specifications and requirements of the machines make them a success.

Marine support vessels for trenching works

SEA also has the use of two vessels. The Iskatel-2 is a DP2 catamaran vessel completely restructured in 2009. It has a draft of 2.5m and can host up to 25 people. Its main objective is to support trenching operations, but it is also available for all offshore activities such as surveys and general support.

Trimaran Rossana is a modular pontoon that is easily transportable both by land and sea. It was modified from a catamaran to a trimaran for safety and versatility reasons. With a draft of 1.5m, it is an ideal means for jobs in shallow water and in-shore approaches.

SEA Company Brochure

Sea Group is composed of five companies located in Italy, Malta and Brasil; and has its headquarters in Ravenna. The position of the working structures of the Group has been chosen for strategic and business reasons: Malta plays a fundamental strategic role being in the centre of the Mediterranean sea, as it allows SEA to manage the Mediterranean Oil and Gas Industry.

SEA Awarded Trenching Contract

SEA has been awarded the trenching of 9,078m of pipeline (40in and 36in) and the laying and trenching (4,776m) of an optical cable in Myanmar.