le "pig" est un racleur pour conduites de pétrole

"The manifold design allows the production headers to be sized using nominal pipe diameters. In most project applications, all manifold piping connections are welded to minimize leak paths and increase reliability. Many manifolds feature a removable
pigging loop to allow round trip pigging of the production flowlines.</> Manifolds are designed to operate for up to 25 years at water depths to 10,000 feet"
www.fmctechnologies.com/.../Manifold/FTFTI6569Manifoldssled...


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Note added at 15 mins (2012-04-25 19:55:26 GMT)
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"A specific example of this type of work is the Ormen Lange project, which will supply 20 per cent of the UK’s gas consumption. For this project, we delivered the pipe end modules, In Line Tee and a pig loop. The equipment operates at depths of about 850 metres. These are used to connect the pipeline itself to the template where the wellheads are located.”
http://www.europeanoilandgas.co.uk/article-page.php?contenti...

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Note added at 19 mins (2012-04-25 19:58:53 GMT)
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"Pigs are intelligent robotic devices that are propelled down pipelines to evaluate the interior of the pipe.
Pigs can test pipe thickness, and roundness, check for signs of corrosion, detect
minute leaks, and any other defect along the interior of the pipeline that may either
impede the flow of gas, or pose a potential safety risk for the operation of the
pipeline. Sending a pig down a pipeline is fittingly known as 'pigging' pipeline.
The export facility must contain equipment to safely insert and retrieve pigs form the
pipeline as well as depressurization, referred to as pig launchers and pig receivers"
http://www.naturalgas.org/naturalgas/transport.asp