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Qatargas in early June 2012 has awarded Aberdeen-based pipeline engineering company, STATS Group a ten-year contract to provide remote pipeline isolation equipment.

This is the first project STATS has been awarded by Qatargas. The company is recruiting an extra 20 staff to support the Qatari project and other major pipeline isolation contracts which are already secured in 2012 and beyond.

STATS will design, manufacture, test and supply a new range of high-integrity Remote Tecno Plugs™ for 32, 34 and 38 inch pipelines which will become part of Qatargas’ emergency pipeline repair system (EPRS) for production facilities in the Arabian Gulf’s North Field, where gas and condensate is transferred by pipelines to Ras Laffan City for export.

STATS comprehensive Tecno Plug™ range provides fail-safe double block and bleed pipeline isolation tools for high pressure operations.

These dual seal isolation plugs are available for remote, tethered, piggable or manual deployment and operation.

The installation of the Remote Tecno Plugs will provide positive isolation at the required location and provide a safe environment to carry out quick and effective repair on subsea pipelines in the event of damage.

The Tecno Plug™ fail safe design uses differential pressure acting on the tool to energise the locks and seals, this is referred to as self energisation. When the isolation plug is self energised the isolation is maintained independent of the control system, it is however backed up by the hydraulic control system which maintains the isolation when the differential pressure is below the self-energisation threshold. Once the Tecno Plug™ is activated the hydraulic circuits are locked in by pilot operated check valves and manual isolation valves (tether controlled) or fail-safe solenoid valves (remote controlled).

With this Tecno Plug™ , operator Benefits:

•      De-commissioning (bleeding down) and re-commissioning (refilling and re-pressurising) of pipelines minimised or eliminated, saving time and reducing costs

•      Production continued during pipeline maintenance or modifications

•      No flaring of gas or displacement of pipeline inventory

•      No emissions of gas or hydrocarbon vapour to the atmosphere during blow down

•      No danger of accidentally flooding offshore pipelines during construction

•      No need to dispose of hydrates, chemicals and contaminated water

•      Isolates short sections of pipeline anywhere in the pipeline system

•      Emergency preparedness and operational readiness

The installation of the Remote Tecno Plugs will provide positive isolation at the required location and provide a safe environment to carry out quick and effective repair on subsea pipelines in the event of damage.

Source : Pipe Lines International and STATS Group

(this article written for 1BINA.my)