Pipelines are constructed using different material depending on their size, pressure requirements and use. Transmission and gathering pipes, the pipes used to transport gas from supply areas to distribution centers, are made of 0.25-inch to 0.5-inch thick steel and have a special coating to protect against corrosion. For distribution pipelines, used by your local gas company to deliver to your home, plastic often is used because it is resistant to corrosion, flexible, and cost-effective especially lines which operate at less than 100 pounds of pressure.