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Port Dolphin Energy to build deepwater LNG port serving Florida.

Port Dolphin Energy LLC has received key environmental permits from the State of Florida to allow construction of onsite components its offshore LNG terminal. When completed, specially designed vessels operated by Port Dolphin's parent company, Hoegh LNG, will return LNG to a gaseous state onboard and move natural gas through the terminal's pipeline.

According to developers, Port Dolphin's infrastructure is designed to enable gas suppliers to provide much-needed natural gas to help serve the state's growing energy needs.

The Florida Department of Environmental Protection (FDEP) has issued an Individual Environmental Resource Permit to build and operate the port and pipeline.

Then-Gov. Charlie Crist and the Florida Cabinet voted in November 2010 to authorize issuance of a long-term easement on state-owned submerged lands to accommodate the undersea pipeline. Port Dolphin received its federal Deepwater Port License in October 2009 and a Certificate of Public Convenience and Necessity from the Federal Energy Regulatory Commission in December 2009.

Plans call for the unloading facility of the deepwater port to be located 28 miles southwest of Tampa Bay. The terminal's 42-mile, 32-inch pipeline, designed to transport 1.2 Bcf/d, will come ashore in Port Manatee, FL and be capable of transporting enough to serve more than 1 million homes.

Re-gasification Vessels (SRVs)

The Port Dolphin deepwater port would be capable of mooring Shuttle and Regasification Vessels (SRV). The SRVs are designed to carry LNG combined with a capability to regasify the natural gas prior to offloading it for transport to shore. The SRVs themselves are almost entirely propelled by natural gas which significantly reduces their environmental impact compared to conventional vessels.

Up to two SRVs would temporarily moor at the proposed deepwater port by means of a submerged unloading buoy system. Two unloading buoys will be separated by a distance of 3.1 miles. The unloading buoys will moor each SRV on location throughout the unloading cycle. Each unloading buoy will have eight mooring lines consisting of wire rope and chain. The mooring lines will connect each unloading buoy to eight anchor points most likely consisting of driven piles on the seabed. The unloading buoy, designed by Advanced Production Loading AS (APL), is also commonly known as a Submerged Turret of Loading (STL) Buoy.

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An SRV will typically moor at the deepwater port for between four and eight days, depending on vessel size and send out rate. The two separate buoys will allow natural gas to be delivered in a continuous flow, without interruption, by scheduling an overlap between arriving and departing SRVs. The unloading buoy technology and associated equipment for Port Dolphin is similar to that used in the Gulf Gateway deepwater port and that is planned for the Northeast Gateway, Neptune and Calypso projects. The technology has also been used at several locations overseas including the North Sea.

When not connected to an SRV, the unloading buoy will be submerged 60-70 feet below the sea surface. In this position, the buoy will be held in position by the mooring lines and would be resting on the STL Buoy landing pad. A marker buoy and retrieval line will be used to locate and recover the buoy as the SRV arrives at the deepwater port.

The unloading buoy will be retrieved from its submerged position by means of a winch and recovery line. It will be hoisted up through a moon pool in the forward part of the SRV where it will be located in a receiving cone within the hull trunk. After the buoy is locked in position, unloading of natural gas will begin. The gas will be unloaded through the flexible riser into the pipeline end manifold (PLEM) for transportation to shore via the subsea pipeline.

The SRVs will be equipped to transport, store, and vaporize LNG and to meter natural gas. Each vessel will have insulated storage tanks for the LNG located within the hull. Each tank will be equipped with an in-tank pump to circulate and transfer LNG, at a temperature of -261[degrees]F, to the vaporization facilities located on the deck of the SRV The vaporization system will have a closed-loop cycle using glycol/water brine as the recirculating heating medium. This recirculating medium will heat the LNG and the medium itself will be warmed using steam from the SRV's natural gas boilers.

Hoegh LNG is the sole owner and sponsor of the project through its 100%-owned subsidiary, Port Dolphin Energy LLC. Construction of Port Dolphin is set to begin in 2011 with completion in 2013.
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Title Annotation:2011 INTERNATIONAL Offshore Report
Publication:Pipeline & Gas Journal
Date:Apr 1, 2011
Words:754
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