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World's first Invar alloy LNG piping under the seabed.

Author(s) : YAMAMOTO S., YAMASAKI Y., UENO Y., et al.

Summary

Invar alloy has a very low coefficient of linear expansion which is 1/10th that of austenitic stainless steel. Therefore, while stainless steel LNG piping requires a mechanism such as pipe looping to absorb thermal contraction, applying Invar alloy can lead to simple straight piping, reducing its construction cost significantly. Construction of 12-inch in diameter and 1300 m long LNG transferring piping in an undersea tunnel 30 m below the surface of the sea is being planned, where Invar alloy can be applied most advantageously. This piping made of Invar alloy will connect Osaka gas Senboku LNG Terminal 1 and 2 facing each other across a canal. The construction will be completed in 2006. Applying Invar alloy enables straight piping without pipe looping, resulting in the reduction of the inner diameter of the tunnel from 4 m for stainless steel piping to 2.4 m. Accordingly, not only the cost for piping but also that for the tunnel will be reduced significantly. Aiming at further reduction of the construction cost for the tunnel, a combination of comparatively shallow shafts and inclined shafts is applied.

Details

  • Original title: World's first Invar alloy LNG piping under the seabed.
  • Record ID : 2007-1865
  • Languages: English
  • Source: LNG 14. Proceedings of the 14th international conference and exhibition of liquefied natural gas [CD-ROM].
  • Publication date: 2004/03/21

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