page_title: LNG carrier
section_title: TGZ Mark III
hierarchical_section_title: LNG carrier / Containment systems / TGZ Mark III
caption_attribution_description: English: Technigaz Mark III type LNG membrane inside an LNG carrier. Photograph taken during routine inspection in a docking period also shows the pump tower in the back side of the tank. The waffle/grid corrugations allow the 304L stainless steel tank liner to safely accommodate thermal expansion/contraction during the loading/unloading of cryogenic, liquified gas.&#91;1&#93;&#91;2&#93; ↑ GTT Mark III Technology.&#32;Gaztransport &amp; Technigaz (GTT)&#32;(Nov 7, 2013). ↑ Mark III System.&#32;Gaztransport &amp; Technigaz (GTT)&#32;(2013). Archived from the original on 2014-12-29.
context_page_description: An LNG carrier is a tank ship designed for transporting liquefied natural gas. As the LNG market grows rapidly, the fleet of LNG carriers continues to experience tremendous growth.
context_section_description: Designed by Technigaz, these tanks are of the membrane type. The membrane consists of stainless steel with 'waffles' to absorb the thermal contraction when the tank is cooled down.  The primary barrier, made of corrugated stainless steel of about 1.2 mm (0.047 in) thickness is the one in direct contact with the cargo liquid (or vapour in empty tank condition). This is followed by a primary insulation which in turn is covered by a secondary barrier made of a material called "triplex" which is basically a metal foil sandwiched between glasswool sheets and compressed together. This is again covered by a secondary insulation which in turn is supported by the ship's hull structure from the outside.
  From the inside of the tank outwards, the layers are:
  LNG
  Primary barrier of 1.2 mm thick corrugated/waffled 304L stainless steel
  Primary insulation (also called the interbarrier space)
  Secondary barrier within triplex membrane
  Secondary insulation (also called the insulation space)
  Ship's hull structure.
caption: Interior of a non-spherical, Technigaz Mark III stainless steel membrane, LNG tank
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