Excelerate's FSRU's/SRVs

Excelerate’s Energy Bridge® floating storage and regasification units (FSRUs), are purpose-built LNG tankers that incorporate onboard equipment for the vaporization of LNG and delivery of high-pressure natural gas. These vessels load in the same manner as standard LNG tankers at traditional liquefaction terminals and also retain the flexibility to discharge in three distinct ways. These are:

• As a liquid at a conventional LNG receiving terminal;
• As a gas through the FSRU’s connection with a subsea buoy in the hull of the ship; and
• As a gas through a high-pressure gas manifold located forward of the vessel’s LNG loading arms.

Specialized Equipment

Our Energy Bridge FSRUs are designed to incorporate certain equipment and processes onboard to accomplish the task of offshore LNG vaporization. The five major components are:

• High-pressure cryogenic pumps, which bring the LNG from the cargo tanks up to pressure prior to vaporization;
• Shell-and-tube vaporizers, which convert the LNG back to vaporous natural gas;
• Oversized boiler, which provides the steam and power necessary to sustain vessel operations and the shipboard regasification process;
• STL buoy compartment, which is designed to accommodate a submerged turret-loading buoy system, which serves as the mooring system for the vessel;
• Reinforced LNG tanks and pump tower, which are designed to withstand the sloshing loads encountered throughout loading levels while at sea.

Vaporization of LNG

To accomplish the task of offshore LNG vaporization, our FSRUs may be operated in one of three ways:

• Closed-loop mode, in which steam from the FSRU boilers is used to heat fresh water circulated through the shell-and-tube vaporizers in the regasification plant. This results in minimal usage of seawater by the EBRV;
• Open-loop mode, in which relatively warm seawater is drawn in through the FSRU’s sea chests. This warm seawater is used as a heat source and passed through the tshell of the shell-and-tube vaporizers, causing the vaporization of the LNG. During this process, the temperature of the seawater is lowered by approximately 13 degrees Fahrenheit (7 degrees Celsius). For this reason, the open-loop mode is not applicable for water temperatures below 45 degrees Fahrenheit;
• Combined mode, in which seawater at temperatures between 45 and 58 degrees Fahrenheit can be used when heated by steam from the FSRU boilers to provide sufficient heat for the vaporization of the LNG.

The maximum rate of discharge of the natural gas from our Energy Bridge® FSRU into the deepwater port will be determined by a combination of the availability of capacity on downstream pipelines and the regasification capabilities of the facilities located onboard each FSRU. 

The following table describes the regasification capabilities of the FSRUs: