Dominion Energy Carolina Gas Transmission, LLC, operates approximately 1,500 miles of transmission pipeline in South Carolina and Georgia. These steel lines are 2-24 inches in diameter and operate at pressures up to 1200psi.
Dominion Energy's pipelines transport natural gas from other pipelines to local utility companies and major industrial facilities. The pipeline is regulated by the Pipeline Hazardous Materials Safety Administration (PHMSA) and the Federal Energy Regulatory Commission (FERC).
Current Pipeline Projects
About Our Pipelines
Pipeline Compressor Stations
What are Compressor Stations?
Compressor stations compress and push the gas through the pipeline at an optimal rate. Because friction and elevation changes along the pipeline can slow gas and reduce pressure, compressor stations are usually located between 40 and 70 miles apart. These stations help move natural gas 24 hours a day, seven days a week.
Every compressor station has emergency shutdown capabilities that help stop the unit and isolate and vent its piping. Dominion Energy Carolina Gas Transmission performs routine tests and maintenance of these shutdown features as required by pipeline regulations. During shutdowns, natural gas is routed around the station to ensure reliability. Compressor stations are operated and monitored remotely from Dominion Energy Carolina Gas Transmission's centralized control center by highly trained and experienced employees.
Dominion Energy Carolina Gas Transmission performs the following routine activities to help ensure the safety and reliability of our pipelines:
Mowing - Pipeline rights of way are mowed annually, every other year or every third year based on FERC guidelines and Dominion Energy Carolina Gas Transmission's Right of Way Maintenance Plan.
Side trimming - Periodically when branches on trees form a canopy over the pipeline, Dominion Energy Carolina Gas Transmission will side-trim to make sure that the pipeline is visible from above so that it can be aerially patrolled for safety reasons.
Pipeline Integrity - Periodically, personnel insert inspection devices into the pipeline or conduct above ground surveys using instruments to verify the integrity of the pipeline. These inspections typically involve multiple personnel, equipment and vehicles.
Leak survey - Conducted annually in some areas and semi-annually in other areas as prescribed by PHMSA. This will involve personnel walking and driving the right of way with instruments to check for gas.
CP survey - This will involve multiple personnel walking and driving the right of way with instrumentation taking measurements.
Station maintenance - Personnel enter fenced facilities multiple times each year to take readings and conduct inspections and maintenance of the equipment.
Marker maintenance - Personnel in trucks replace damaged markers, paint markers, reset fallen markers, or add new markers on the pipeline where required.
Erosion repair - Typically conducted with backhoes and bulldozers to correct washouts that could expose the pipeline.
Aerial patrol - Conducted at least four times a year by slow, low-flying aircraft.
Pipeline Rights of Way
Dominion Energy Carolina Gas Transmission's Pipeline rights of way are marked with signs showing the pipeline's approximate location and a telephone number where Dominion Energy Carolina Gas Transmission representatives can be reached. For security reasons, detailed maps of the pipeline are not publicly available; however, our representatives will be happy to show you where our pipeline is located in your area. Just call 1-800-789-7272.
Use of the Right of Way
Land may be used for most residential, commercial, or agricultural purposes provided the use does not interfere with safe operation, maintenance, inspection, and repair of the pipeline or obstruct access.
Structures/activities that require a permit or other authorization
Dominion Energy Carolina Gas Transmission may allow some structures and activities within right-of-way in certain instances. If allowed, certain guidelines apply and a permit may be required. Examples include:
- Water lines
- Communication cables
- Electric lines
- Overhead cables
- Sewer lines
- Drainage ditches
- Logging roads
- Excavation or filling
Examples of structures or activities prohibited within our right-of-way include but are not limited to the following:
- Abandoned materials and debris
- Basketball goals (in-ground)
- Camping sites or campers
- Concrete pads
- Decks or porches
- Decorative lights
- Deer stands or blinds
- Dumpsters, trash dumps or junk cars
- Electrical boxes
- Guy wires
- Large shrubs
- Mail boxes
- Mobile homes
- Outdoor grills or pits
- Permanent dog and animal shelters
- Picnic shelters
- Playground equipment
- Pole sheds
- Ponds, pond dams
- Recreational vehicle traffic
- Roof overhangs
- Satellite equipment or antennas
- Septic tanks or drain fields
- Set poles
- Sprinkler heads
- Stockpiled materials
- Street lamps
- Swimming pools
- Tree farms (including Christmas tree farms)
- Water retention/diversion devices/structures
Dominion Energy Carolina Gas Transmission encourages you to contact us at 1-800-789-7272 early in the planning process to discuss your proposal and determine what, if anything, may be required to work or place improvements near or across our pipelines.
Before pipeline construction begins, land surveys are done to evaluate a variety of factors including environmental, cultural, land use and scenic resources. Once the best route is determined and easements are acquired from landowners, construction can begin.
- Pre-construction evaluation
Dominion Energy Carolina Gas Transmission starts by evaluating environmental features along proposed pipeline segments. Utility lines and agricultural drainages are located and marked to prevent accidental damage during pipeline construction. Next, the pipeline’s centerline and the exterior right-of-way boundaries are staked.
- Clearing and grading
We then clear the right of way of vegetation. We install temporary erosion controls prior to any earth-moving activities.
Topsoil is removed from the work area and stockpiled separately in agricultural areas so that it can be reapplied after the trench has been backfilled. Dominion Energy Carolina Gas Transmission then uses backhoes to dig a pipeline trench. That soil is temporarily stockpiled on the non-working side of the trench until it is used to backfill the trench.
- Pipe stringing
Individual pieces of pipe are placed along the right of way adjacent to the ditch and arranged so they are accessible to construction personnel. A mechanical pipe-bending machine bends the individual joints of pipe to allow for natural ground contours and when the route changes direction.
- Welding and coating pipe
After the stringing and bending are complete, the pipe sections are aligned, welded together, and placed on temporary supports along the edge of the trench. All welds are then inspected visually and by x-ray. A coating is then placed on the welded joints. The entire pipeline coating is electronically inspected to locate and repair any coating faults or voids prior to placing the pipe in the ground.
- Lowering pipe and backfilling
The pipe is lowered into the trench by side-boom tractors. The trench is backfilled using a backfilling or bladed equipment; no foreign materials are permitted in the trench.
The pipeline is hydrostatically tested following federal regulations. Test water is obtained and disposed of in accordance with applicable federal, state and local regulations. The new pipe is pressure tested with water to 1 and ½ times the pressure at which it will operate to ensure it is sound. Before the water is discharged, it is analyzed to make sure it is safe and then is discharged in a way to prevent erosion or impact to wetlands.
Dominion Energy Carolina Gas Transmission’s policy is to clean up and restore the work area as soon as possible. After the pipeline is backfilled and tested, disturbed areas are restored as close as possible to their original contours. Restoration measures are maintained until the area is restored, as closely as possible, to its original condition.