Omnisens Watches Over Shah Deniz DEH System

An examPle of DEH

Subsea asset monitoring specialist, Omnisens, has provided Break Detection systems to check the integrity of the Direct Electrically Heated flowline system being installed in the Shah Deniz field.

The Shah Deniz field was discovered in 1999. It is located on the deep water shelf of the Caspian Sea, 70 kilometers south-east of Baku, in water depths ranging from 50 to 500 metres.

The world’s largest DEH system, with a total of 130 km of the cable system made by Nexans, provides flow assurance for 10 subsea flowlines.

DEH is a technology for flow assurance, developed to safeguard the wellstream flow through the pipeline to the platform. Alternating current (AC) transmitted from the DEH cable runs through the steel in the pipe, which heats up due to its own electrical resistance.

By controlling the current, the pipeline inner wall can at all times be maintained above the critical temperature for wax and hydrate formation. As a result, problem free and reliable transportation is achieved. Traditional methods for flow assurance, by the use of chemical treatments and pressure evacuations, have considerable operational costs with long down times and may present a risk to the environment.

The operators use the DEH system during shutdowns, to raise the temperature of the fluid from ambient to above hydrate formation temperature within a specified time period and during tail-end production.

An important safety requirement for the DEH is that a power cable failure should be detected and located quickly to avoid damage to the pipeline. The main threat to the DEH is from trawling, anchor drag and dropped objects, which could rupture the cable.

Share this article

Follow Subsea World News

Events>

<< May 2016 >>
MTWTFSS
25 26 27 28 29 30 1
2 3 4 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 31 1 2 3 4 5

Seawork International 2016

This event showcases product from Railway, Shipping & Aviation industry.Seawork International is the largest and fastest growing international…

read more >

EEMUA subsea engineering course: materials selection and corrosion control

This two and a half day training course is recommended for both discipline and project focused engineers from a variety of backgrounds who want to gain an understanding of the fundamental principles for selecting and specifying materials of construction for subsea equipment, and for corrosion control during deployment, commission and operation. The course is based on the EEMUA User Guide to subsea materials selection and corrosion control, EEMUA Publication 194.

It is operated in association with the Society for Underwater Technology (SUT). Permanent employees of EEMUA and SUT member companies are entitled to a 20% discount off the standard course fee.

More info

read more >

5th International Conference Offshore Cabling 2016

At the upcoming event you will get the opportunity to learn from offshore cable installation case studies and gain insights into latest…

read more >

OPEX Global Subsea Power Cables Forum for the O&G and Energy Industry 2016

This year subsea power cable forum will bring together key experts from Oil and Gas and Energy Industry globally to discuss the current…

read more >