The Subtrench Group is a dynamic leader in providing groundbreaking underwater trenching technology and services worldwide and combines companies and employees with over 3 decades of experience in subsea equipment design, fabrication, and operation.
Subtrench Group’s objective is to provide safe, reliable, environmentally friendly, cost efficient, minimum risk, innovative umbilical, cable, flexible and pipeline trenching in the most effective way to support our trenching clients.
The Subtrench Group has extensive capability to successfully enable it to readily and competently perform all aspects of trenching work. The capability covers all aspects of pipeline and stiff flexible and stiff umbilical trenching; cable, flexibles and umbilical trenching; remedial trenching of pipelines, cables, flexibles and umbilicals trenching. The Subtrench Group is also involved in Deep Sea Mining spreads.
The principals and personnel of Subtrench are committed to performing all work to the highest level of safety, not only for the personnel involved in the work but also for the pipeline, cable, flexible or umbilical being trenched as well as protection of the local environment through the use of careful Planning and Preparation, Risk Analysis, Job Safety Analysis (JSA), Tool Box Talks and the use of appropriate Operating Methodologies and Experienced Personnel.
Subtrench has performed extensive R&D in order to provide state of the art trenching equipment and operational methodologies to minimise the risks whilst maximising the reliability and performance in the field. Scale model testing and full size equipment testing has been performed as well as various studies and research.
The executive team have successfully developed or in the process of developing the following trenching spreads:
The Subtrench Group designs, builds and operates their own equipment. The Subtrench Group has also provided specialized designs for various Client’s internal use. The Subtrench Group has combined their significant offshore and subsea trenching experience together with detailed R&D, including model and full-size equipment testing, in order to provide state of the art trenching equipment and operational methodologies suitable for the many varied trenching project requirements encountered.
The Subtrench Group is also working on Deep Sea Mining spreads.
In particular, the Subtrench Group has sound and proven expertise and operational experience in the following areas:
Past projects have included trenching shore crossings, shore approaches, near shore and deeper waters throughout the world. The work has been carried out from Barges, Pontoons and DP vessels. Soils trenched have ranged from sands and silts through soft and hard clays with low, medium and high pressure water jetting and combination mechanical cutter/ water jet systems; and also calcarenite and rock using mechanical cutters. Site conditions have ranged from mild to extreme and have covered from the Arctic to the Tropics.
Pipelines have ranged from 6 inch to 42 inch nominal size and cables from 32mm fibre optic to 210mm OD double armoured power cables. Some pipelines have been trenched to very stringent vertical out of straightness tolerances to account for upheaval buckling. Large diameter (210mm OD) power cables have been trenched to more than 3.3 meters on a single pass. Pipeline trench depths have been to 5 meters with multipass.
Past projects which have been performed by; or which the Subtrench Group team has participated in the development and operation of; or a Subtrench Group designed equipment spread has been used for include:
