Developed jointly with our partner Subsea 7, our electrically heat traced flowlines are implemented through reeling, with the state of the art vessels in Subsea 7’s fleet. EHTF allows for unique single-line tieback architectures without the need for historical flow assurance mitigations (chemicals).
These heat traced pipelines can be used:
› To eliminate pipeline blockages and downtime associated with wax build-up or hydrate plug formation;
› To pilot the fluid arrival temperatures and thus optimise top-side production operations;
› To avoid any cooldown through pipeline heating, enabling independent pipeline operations when linked to manifolds or tied into non-operated assets, thus minimising production downtime and risk of production upset.
Our electrically heat traced flowlines feature heated wires located under the Izoflex insulation within the inner pipe. They are built using three trademarked technologies:
our innovative heat traced flowline
efficient insulation, offering the lowest conductivity in the pipeline market
our wire architecture developed for the EHTF system and the specific requirements of the EHTF environment. We have developed a unique savoir-faire in electrical system design and performance and we are able to deliver custom electrical testing in our development facilities.
This efficient technology ensures a low power system of resistive heating, ten to fifteen times less power hungry than traditional DEH systems for similar duty. In fact, the EHTF requires less than 10 W/m for typical hydrate mitigation.
What’s more, the low conductivity of Izoflex also provides the most compact system, as well as the largest flow diameter for the same outer diameter.
Predictable corrosion behaviour
Contrary to direct heating solutions, no current is passed in the pipelines themselves. This ensures robust operations and predictable corrosion behaviour, with traditional corrosion mitigation techniques.
In passive operations, the Izoflex also allows for long no-touch times, providing operational flexibility.