Natural gas is delivered to millions of homes and businesses through an extensive network of pipelines – that span continents, cross mountains, and run beneath our cities. The system is designed to transport large volumes of gas safely and efficiently, gradually reducing pressure until it arrives at your stove or heating system.
While most people only see the small service line leading to their house, the system behind it is a layered infrastructure designed to safely move large volumes of gas over long distances and reduce pressure step by step until it reaches consumers.
How do natural gas pipelines work: Transmission vs. Distribution
Natural gas pipelines can be one of two types:
Transmission pipelines are the “highways” of the gas system. They transport huge volumes of natural gas across regions and countries.
- Pressures typically range from 30 to 100 bar (450–1,500 psi), and the pipelines are usually made of high-strength carbon steel with diameters from 16″ up to more than 48″.
Distribution pipelines are the “local roads.” They take gas from transmission lines and deliver it to cities, businesses, and homes.
Distribution systems use lower pressures.
- Intermediate/mains: 4–20 bar (60–300 psi), often steel or medium-density polyethylene (MDPE).
- Service lines: less than 4 bar (typically under 60 psi), usually plastic (PE) for flexibility and corrosion resistance.
How Gas Is Propelled Through Pipelines
Unlike liquids that can be pumped continuously, natural gas is moved by compressing it to high pressure. Along transmission pipelines, compressor stations are installed every 50–200 km. Large gas turbines or electric motors drive compressors that squeeze the gas, restoring its pressure and keeping it flowing.
As the gas travels closer to consumers, pressure is gradually reduced at city gate stations and local regulators. Finally, the flow into homes and businesses is not powered by pumps, but rather by the natural pressure drop created by consumption—as gas appliances draw gas, fresh supply moves in to balance the system.
Pipeline Materials and Coatings
To withstand pressure and environmental conditions, pipelines are typically made of high-strength carbon steel. But steel alone is not enough: external protection is critical.
Pipelines are coated with materials such as:
- Fusion-bonded epoxy (FBE),
- Polyethylene or polypropylene multi-layer coatings, or
- Coal tar enamel (older systems).
These coatings prevent corrosion, and in buried pipelines they work in tandem with cathodic protection systems that apply a small electrical current to further protect the steel.
How do natural gas pipelines work: locations
Buried vs. Aboveground Pipelines
Buried pipelines are most common. They are installed below the frost line for stability and safety, hidden from view and shielded from external damage.
Aboveground pipelines are used where burial is not practical—such as in compressor stations, river crossings on bridges, or in permafrost regions. These require UV-resistant coatings and insulation against temperature extremes.
Crossing Rivers, Roads, and Obstacles
Building a pipeline isn’t just about laying a straight line—it often must navigate challenging terrain:
- Roads and railways: crossed using horizontal directional drilling (HDD) or boring, allowing the pipe to pass underground without disturbing traffic.
- Rivers: crossed with HDD, tunneling, or by placing the pipe on the riverbed with added weight coatings to prevent floating.
- Mined areas: pipelines are rerouted or designed with flexible joints and protective casings to handle ground movement.
- Mountains: require tunneling, steep-slope installation techniques, or rerouting to avoid unstable geology.
Natural gas pipelines are more than just steel tubes. They are carefully engineered systems, coated and protected against corrosion, buried for safety, or routed through rivers and mountains—all to ensure reliable energy delivery from source to consumer.
At Propipe we offer the best hottap and linestop solutions for natural gas pipelines, as well as launcher and receiver traps. Contact us now.
