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Double Wall Piping System (Marine & Offshore)

LNG Fuel Gas Supply Piping System Double Wall Piping System is to supply the fuel gas to main engine with purpose of protection of explosion and leak-check mainly.
Double wall pipe has excellent performance against high pressure and extreme temperatures.

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Low Pressure & Cryogenic Temperature High Pressure
Size Inner Pipe DN15~300 in general
Outer Pipe DN50~450 in general
Inner Pipe DN25~50 in general
Outer Pipe DN100~150 in general
Fluid Natural Gas & Liquified Gas Natural Gas (Vaporized)
Design Pressure 10~16Bar(g) 300~420Bar(g)
Design Temperature -269 ℃~60 ℃ in general range -90 ℃~60 ℃ in general range
Material Inner Pipe: Stainless Steel 316L
Outer Pipe: Stainless Steel 316L
Inner Pipe: Super Duplex or Duplex
Outer Pipe: Duplex or Stainless Steel 316L

Flange for Double Wall Pipe – Double Lip Flange

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High Pressure

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Low Pressure

  • Low Pressure & High Pressure
  • Vent.holes are calculated in accordance with the air volume.

Flange - High Pressure

Design Pressure 300~420Bar(g)
Design Temperature -90℃ ~ 60℃ in general
Material Super Duplex , Duplex, & Stainless Steel 316L

Flange - Low Pressure

Design Pressure 10~16Bar(g) in general
Design Temperature -20℃ ~ 60℃ in general
Material Stainless Steel 316L
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