00:00 A gas pipeline is a pipe in steel which transports natural gas and is generally part of a network.
00:15 With a diameter which can range from 10cm to 1.2m, the sections of welded steel tubes
00:21 are protected from corrosion by a three-layered covering and also by a cathodic protection
00:27 system where a low electric current is passed through the steel.
00:32 Gas pipelines are usually buried underground at a depth of about 1m.
00:36 In desert zones they are laid on the ground.
00:39 When they are underwater, gas pipelines are laid directly on the sea floor, except near
00:44 the coast where they are buried in a trench to protect them against human activities and
00:48 ocean currents.
00:51 Gas is pumped into the pipeline from a storage site or directly from a gas field.
00:56 Circulating in gaseous form under a pressure of between 6 and 100 bars, the gas can reach
01:01 speeds of 20km/h.
01:04 This circulation leads to a progressive lowering of pressure which is offset by compression
01:08 stations installed around every 150km along the gas pipeline.
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