New Compression Planned For Gulf Coast Southbound Project

Map courtesy of Natural Gas Pipeline Co.

Natural Gas Pipeline Company of America LLC (Natural) has filed an application with the US Federal Energy Regulatory Commission (FERC) requesting authorization to construct, install, and operate the Gulf Coast Southbound Project. The US$145 million project includes new compression at Compressor Station (CS) 300, CS 301, and CS 304.

If approved, the Gulf Coast Southbound Project will enable Natural to deliver about 300,000 dekatherms per day of incremental firm southbound transportation capacity on its Gulf Coast Mainline System to the project shipper, Corpus Christi Liquefaction LLC, with an additional 28,000 dekatherms per day of currently unsubscribed incremental firm capacity to be made available to the market.

Compressor Station 300

Natural proposes to install one new electric-motor-drive (EMD) centrifugal compressor unit with a rating of 10,000 hp (7460 kW), along with two gas coolers, at existing CS 300. The new compressor unit will be housed within a new compressor building. Installation of the new equipment will require new station and yard piping. In addition to the compressor unit equipment and yard and station piping, ancillary auxiliary equipment will be installed at the existing CS 300, including a variable frequency drive installed within a new motor control center (MCC) building, lube oil cooler, filter separator, various valves for pressure control, and fittings.

Built in 1961, CS 300 currently includes three compressor units located in Compressor Building 1, which houses the two 3000 hp (2238 kW) Ingersoll Rand units to be abandoned, and Compressor Building 5, which houses a 6000 hp (4476 kW) EMD ABB/Solar unit, for a total of 12,000 hp (8952 kW). CS 300 also contains an MCC, control room building, gas filter separator units, auxiliary building, process storage tanks, blowdown stacks, gas coolers and cooler piping, suction and discharge piping.

Compressor Station 301

Natural proposes to install one new Solar Mars 100 Turbine/C65 compressor unit, rated15,900 hp (11,861 kW), which will require an extension of the existing compressor building at CS 301. Two gas coolers will also be installed, and two existing filter separators will be removed and replaced with two new filter separators in the same location. In addition to the new compressor unit equipment, ancillary auxiliary equipment will be installed, including one lube oil cooler, a unit control panel, an air intake and exhaust system, a catalytic fuel heater, and various valves for pressure control. These modifications at CS 301 will also require the installation of an MCC within an existing MCC building, and new station and yard piping.

Built in the 1953, CS 301 currently includes one Solar Taurus 70 compressor unit located in a compressor building. Four 2800 hp (2088 kW) Worthington SUTC10 compressor units at CS 301 were previously replaced and two 2800 hp Worthington SUTC10 compressor units were abandoned in place. CS 301 also contains an MCC building, control room building, gas filter separator units, auxiliary building and two compressor buildings, process storage tanks, blowdown stacks, gas coolers and cooler piping, suction and discharge piping.

Compressor Station 304

Natural proposes to install two new Solar Titan 130 Turbine/C65 compressor units, each rated 23,470 hp (17,508 kW), for a total of 46,940 hp, (35,017 kW) to be housed within a new compressor building. Seven gas coolers will also be installed. In addition to the new compressor unit equipment, ancillary auxiliary equipment will be installed, including one lube oil cooler, a unit control panel, air intake and exhaust systems, an emergency generator, a catalytic fuel heater, three filter separators, and various valves for pressure control. The modifications at CS 304 will require the installation of a new auxiliary building fitted with an MCC, and new station and yard piping.

Built in 1951, CS 304 currently includes nine compressor units located in two compressor buildings. Compressor Building 1 houses seven 2800 hp Worthington units. Compressor Building 2 houses a 4000 hp (2984 kW) Worthington ML-14 unit and a 7250 hp (5408 kW) Cooper Bessemer 16W330 unit. The current installed horsepower at CS 304 totals 30,850 hp (23,014 kW).

The total horsepower that Natural will install at the three compressor stations is 72,840 hp (54,338 kW), with 35,990 hp (26,848 kW) to be used to serve the project shipper, and 36,850 hp (27,490 kW) to be used to replace the compressor horsepower that will be abandoned at CS 300 and CS 304.

In addition to the facilities described above, Natural will construct and operate auxiliary facilities, including station piping, gas coolers, and filter separators, at CS 303 and CS 394.