JFSE Launches Twin T8000

Photo: JFSE

Posted by Michelle Howard

James Fisher Subsea Excavation designs Twin T8000 for
large diameter trenching in response to its client's
needs.

Subsea excavation experts at James Fisher Subsea Excavation
(JFSE) - a leading mass/controlled flow excavation (M/CFE)
company - have developed a powerful M/CFE tool capable of
trenching large diameter pipelines in a single pass.

The Twin T8000 was developed to support SapuraKencana Mexicana's
trenching requirements. The offshore construction company needed
more than 14km of a 36" pipeline with concrete coating to be
trenched one meter on top of the pipe.

The tool was developed utilizing JFSE's patented T8000 technology
which has been responsible for the successful completion of
hundreds of subsea excavation projects worldwide over the past 19
years. JFSE engineers created a solution which combined immense
power with precision controllability by bringing two units
together and developing the existing technology further.

The Twin T8000 has a total maximum output of 16,000 liters per
second and had to achieve 0mm + 300mm accuracy of trench on this
project. There were 15 crossings to negotiate.

The Twin T8000 equipment spread was mobilized on board the
offshore supply vessel, Ocean Carrier, in the Gulf of Mexico as
part of SapuraKencana Mexicana's contract for the procurement and
construction of a sour gas pipeline for Pemex covering five
fields.

Graham Murdoch, technical director at JFSE, explained: "Although
we designed the Twin T8000 with this particular project in mind,
the technology will greatly benefit clients with large diameter
trenching needs. The proven combination of power and
controllability of this tool is second to none.

JFSE's fleet of tools provides a non-contact form of excavation
that eliminates the risks associated with other excavation
methods especially around complex subsea assets. Further
enhancing their capabilities, the tools have the additional
benefit of real-time sonar imaging which enables precision
excavation in confined areas, as well as for all cable or
pipeline scopes from 1" through to more than 60" scopes. The
tools are used for applications including pipeline and cable
trenching, deburial, rock dump dispersal and seabed clearance and
preparations. The M/CFE spreads are ideal for moving materials
such as sand, silt and mud, drill cuttings, clay and rock dump.

JFSE's fleet includes 30 M/CFEs and experts at the company, who
are responsible for the successful completion of almost 450
projects over a period of 19 years, are currently developing two
further excavators which will be launched to the market in 2017.

With strategic hubs in the UK, UAE, Singapore, Venezuela, USA,
Brazil, South Africa, China and Mexico and tools based in five
continents, it is the only M/CFE company capable of working on
multiple projects simultaneously. As part of the James Fisher
group, JFSE has access to bases and sister company expertise in
more than 40 countries worldwide.

Feb 23, 2017

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