Transco plans system upgrades to support Louisiana LNG terminal

Transcontinental Gas Pipe Line Co. LLC (Transco) on Dec. 15 filed an application at the Federal Energy Regulatory Commission for a Certificate of Public Convenience and Necessity for the Gulf Trace Expansion Project.

This project, when complete, will provide 1.2 million dekatherms per day (MMdth/day) of firm transportation capacity from Transco’s Station 65, Zone 3 Pool in St. Helena Parish, Louisiana, southward along its mainline and the Southwest Louisiana Lateral and through a new lateral to the existing Sabine Pass Liquefaction LLC liquefied natural gas (LNG) terminal (SPLNG Terminal), located in Cameron Parish, Louisiana.

The project will consist of the following facilities in Louisiana:

  • A new approximately 6.97-mile-long, 36-inch-diameter pipeline (Gulf Trace Lateral) and associated pig traps extending from two existing 24-inch diameter Transco laterals (North High Island [NHI] Laterals C and D) connected to Compressor Station 44 to the SPLNG Terminal, all in Cameron Parish;
  • The addition of two 16,000 International Organization for Standardization (iso) horsepower (hp) gas turbine-driven compressor units at Transco’s existing Compressor Station 44 in Cameron Parish;
  • The construction of a new compressor station (Compressor Station 42) that includes two 16,000 iso hp gas turbine-driven compressor units to be located at the junction of Transco’s mainline and its Southwest Louisiana Lateral in Calcasieu Parish;
  • Piping and valve modifications on Transco’s mainline at existing Compressor Stations 45, 50 and 60 in Beauregard, Evangeline, and East Feliciana Parishes, respectively, to allow for bi-directional flow;
  • The addition of two new meter stations: one adjacent to the SPLNG Terminal in Cameron Parish (SPLNG Meter Station) and one adjacent to the Texas Gas Interconnection in Evangeline Parish (Duralde Meter Station); and
  • Piping, valve modifications and pig launcher and receivers required to tie-in the Gulf Trace Lateral with the existing NHI Laterals C and D at the milepost 6.8 valve site location.

Construction of the project is scheduled to commence in January 2016 at the compressor stations and June 2016 on the pipeline to meet a target in-service date of Jan. 1, 2017.

The application noted: “The purpose of the Project is to provide firm transportation of natural gas on Transco’s interstate natural gas transmission system from Transco’s Station 65, Zone 3 Pool in St. Helena Parish, Louisiana, to the SPLNG Terminal in Cameron Parish, Louisiana. The Project is designed to meet the demand for natural gas required to feed LNG process trains 3 and 4. The proposed Project will enable Transco to provide 1.2 MMdth/day of new firm transportation capacity from Transco’s Station 65, Zone 3 Pool to the SPLNG Terminal. Transco and Sabine Pass have executed a binding precedent agreement for 1.2 MMdth/day of incremental year-round firm transportation service. An open season for the Project was held between April 16, 2014 and May 8, 2014 for additional Project capacity, and no other shippers requested firm transportation service.”

About Barry Cassell 20414 Articles
Barry Cassell is Chief Analyst for GenerationHub covering coal and emission controls issues, projects and policy. He has covered the coal and power generation industry for more than 24 years, beginning in November 2011 at GenerationHub and prior to that as editor of SNL Energy’s Coal Report. He was formerly with Coal Outlook for 15 years as the publication’s editor and contributing writer, and prior to that he was editor of Coal & Synfuels Technology and associate editor of The Energy Report. He has a bachelor’s degree from Central Michigan University.