What is black iron pipe?

Black iron pipe is a steel pipe with a dark oxide coating, threaded at each end, that serves as the standard material for distributing natural gas and propane throughout homes and businesses. The black finish comes from the manufacturing process and is intentional rather than a flaw. Unlike galvanized pipe, which has a protective zinc coating, black iron lacks this exterior treatment, making it unsuitable for water lines but ideal for gas applications where corrosion from moisture is not a concern.

The threaded connections on black iron pipe allow plumbers to assemble gas lines without welding. Fittings screw onto the pipe ends, creating tight seals that meet building codes. Pipe diameters range from half-inch to two inches, with wall thickness rated to handle the pressure of natural gas and propane systems safely. In Aiken and most U.S. jurisdictions, black iron is the required material for gas service lines, both inside and outside buildings, from the meter or regulator to appliances like furnaces, water heaters, and stoves.

Because gas lines demand strict adherence to safety standards, installation and repair should be performed by licensed professionals. If you need a gas line installed, upgraded, or inspected, qualified plumbers in the area can ensure all work meets local codes and operates safely.