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published: 01.12.2011

Newsletter December 2011

Omnisens newsletter
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COOL SUBSEA INTERCONNECTOR  LINKS GUANGDONG TO HAINAN ISLAND (32 km)

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To secure the power supply to Hainan Province, China Southern Power Grid Company have installed a 500 kV interconnector across the Qiongzhou Strait which separates Guangdong from Hainan Island. The temperature of the 32 km interconnector, installed by Nexans Norway AS, is monitored by Omnisens Ditest.
Using optical fibers attached to the three cables as distributed sensors, Ditest monitors the temperature continuously in real time, along the entire submarine cable. The Ditest detects and locates any temperature anomalies, communicating them to the operator, who can take rapid appropriate action to secure the supply and protect the cable.

In addition, the Ditest provides real-time temperature data to the Dynamic Rating System (DRS) allowing the performance of the power cable to be optimized.
Configured for automatic and permanent monitoring, the monitoring system design offers full redundancy.

More information on monitoring long power cables: http://www.omnisens.com/ditest/3431-power-cables.php
and the case study: http://www.omnisens.com/docs/CS-006%20%28Hainan%29%20en-w01.pdf

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WHERE DID THE EARTH MOVE?

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In partnership with ISI Solutions Peru SAC, Omnisens DITEST AIM system is being fitted to the geohazard sensitive area of the Camisea-Lurin gas pipeline, owned by Transportadora de Gas del Peru (TGP) and operated by  Compania Operadora de Gas del Amazonas SAC (COGA). Since the pipeline is at risk from ground movement, several sections distributed over the Selva Alta region will be instrumented with fiber optic strain and temperature sensors which detect, locate and measure small changes all along the affected section.  Over 60 km of pipeline span is monitored using one interrogator unit.
The ground movement detection cable is placed in a trench alongside the pipeline and temperature detected using an existing telecoms cable laid alongside it. This is the first time a retrofit over this length has been carried out using distributed fiber optic sensing, highlighting the importance of Omnisens ground movement detection in the Operator's integrity management program.

How does Ditest help secure the integrity of pipelines?
More details at: http://www.omnisens.com/ditest/3411-pipelines-pim.php

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WAX AND HYDRATES NOT WELCOME HERE!

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Omnisens is checking the temperature of a direct electrically heated flowline recently installed in the North Sea. The 24 km flowline, operated by Statoil, uses Direct Electrical Heating (DEH) to prevent blockages caused by hydrate and wax formation. The Omnisens Ditest detects and locates breaks in the cable (which may be caused by dragged anchors or nets) within a fraction of a second. The Ditest, based on Brillouin fiber optic distributed sensing, also continuously monitors the condition of the Direct Electrical Heating system alerting the operator to adverse temperature events.

The Case Study is available at: http://www.omnisens.com/ditest/3411-pipelines-pim.php

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