Sample Solution

There are impurities in LNG, water is the one that makes the LNG corrosive. The risk of corrosion is that corrosion can damage the fuel pipe in a way that the fuel line will leak LNG.
Able to resist temperatures between -180 and 100 ˚C.
The LNG will be colder than -162 C° while bunkering the fluid. This is because of remaining the temperature of -162 in the tank, there are a lot of vapours inside of the tank when it is 15% full. The gasses are warmer than the -162 C. So the temperature in the tank drops back to -169 while bunkering.
10 bar working pressure, able to resist 40 bar pressure
For safety reasons from the class the fuel line is required to resist 4 times the working pressure. The second wall of the double walled fuel lines is also required to resistant this pressure.
Non flammable
Pipes are required to be fire proof and never react to fire or static/electrical energy.
Made of stainless steel
The fuel lines are required to be made of stainless steel. This is a conclusion based at the first 2 specifications.
The fuel lines are required to be double walled
The fuel lines from the tanks to the valve room are required to have a second enclosure for leakages or small spills. From the valve room to the engine are double walled fuel lines with between the first and second layer an overpressure of inert gas.
Strength specifications
The fuel line material is required to have a minimal yield strength of 4 mPa.
Fuel line material
There is an material analysis made based on: