With LNG becoming increasingly viable and popular as a marine fuel,
E&CO continues to develop technical solutions that facilitate this trend
OFFSHORE STORAGE AND REGASIFICATION
E&CO OFFSHORE STORAGE AND REGASIFICATION
Natural Gas exists at ambient temperature in gaseous form, when it’s considering for a transport and storage. So, transfer and storage are more efficient on liquid form since volume of the liquid Natural Gas decreases to 1/600
Storage tank shall provide sufficient insulation method to hold -163°C of liquefaction temperature of natural gas.
As well as Storage, Proper vaporization capacity is very important to supply the amount of required gas from equipment.
We provide the best storage and vaporize system to meet customer’s requirements and installation conditions.
The purpose of LNG Storage Tank in the offshore can be classified into Cargo Tank which requires simple storage purpose, and Fuel tank which requires to storage fuel for ship propulsion.
In general, Cargo Tank is IMO Type B(MOSS TYPE) and MEMBRANE TYPE, and Fuel Tank is mostly in IMO Type C. IMO Type C tank does not require a secondary barrier and designed as pressure vessel tank to hold over 2 bag G vapor pressure. Therefore, the LNG vapor temperature increases by the higher pressure inside the tank to decreases BOG rate and there is advantage of simpler installation and low maintenance cost. However, it is difficult to apply to vessel that requires large fuel tank for long distance route because of heavier weight and the space efficiency is low.
E&CO can also suggest Bi-Lobe type that compensate the space efficiency of IMO Type-C tank.
Main role of REGASIFICATION in offshore can be divided into FGSS for the purpose of fuel supply into Engine, and NG supply to onshore. The main purpose of FGSS is classified into LOW PRESSURE (6 ~ 9 bar G) and HIGH PRESSURE (270 ~ 330 bar G) depending on the engine type. Normally, in case of low pressure, PBC(Pressure Build-Up Coil) feed to the vaporizer by raising its own tank pressure. However, In case of high pressure, the pressure of the tank itself is not enough to use pressure difference. Therefore, LNG is supplied and boosted by PUMP.
As mentioned above, E & CO is very specialized in the optimize system configuration which consider the purpose of facility and installation condition and cost.
LNG Storage Tank
Manufactured and certified to store LNG at -163℃, and requires insulation that can block heats from atmosphere.
Method of insulation is various such as Vacuum&Perlite, PUF, and N2 Sealing. Method should be chosen with consideration of economical and suitable for usage.
Type of Marine LNG Fuel Tank use is widely applied to Independent Type-C and Independent Type-B.
Type of Marine Vaporizer is Heat Exchanger Type which is a method of Heat Exchange with LNG after heat is applied to fluid such as Glycol due to space constraint and Seawater Vaporizer using seawater other than Glycol It is economical because there is no additional equipment such as IHM Heater, while the sea water temperature is not enough for LNG to vaporize. PCHE and Shell & Tube are typical examples of heat exchanger type that is mainly used.
FEED PUMP, HP PUMP
Installed when pressure rise and stable supplying required.
There is various type of pumps such as Submerged Type, Reciprocation Type, Centrifugal Type and etc.
Equipment to raise the temperature of the glycol water required for heat exchange, and heating source can be Steam or Electric or other multiple heat sources.
Main material is stainless steel which is resistant to corrosion and heat. Electric type requires periodic maintenance.
Determines the size of piping according to the required flow rate for supply and regulates pressure to maintain the stable flow of NG by Regulator.