Steel pipe coated with zinc to prevent corrosion, commonly used in plumbing and water supply systems before being largely replaced by modern materials.

Galvanized pipe is steel pipe that has been coated with a protective layer of zinc through a hot-dip galvanizing process to prevent corrosion and extend the pipe’s service life in water supply and plumbing applications. This coating process involves immersing the steel pipe in molten zinc, creating a metallurgical bond that provides excellent corrosion resistance for many years of service. Galvanized pipe was the standard material for residential and commercial water supply systems from the early 1900s through the 1960s, when it began to be replaced by copper, plastic, and other modern piping materials that offer superior performance and longevity. While no longer commonly installed in new construction, millions of feet of galvanized pipe remain in service in older buildings, requiring understanding for maintenance, repair, and replacement considerations.

The primary purposes of galvanized pipe include providing corrosion-resistant water supply lines for potable water distribution, creating durable plumbing systems that can withstand normal water pressure and flow requirements, offering cost-effective piping solutions that were economical during their era of widespread use, providing threaded connections that allow for relatively easy installation and repair, delivering adequate service life under normal conditions before replacement becomes necessary, and meeting plumbing codes and standards that were in effect during their installation period.

Fun Fact: The galvanizing process was invented by French engineer Paul Jacques Malouin in 1742, but it wasn’t until 1837 that Stanislas Sorel patented the hot-dip galvanizing process still used today. The term “galvanized” comes from Luigi Galvani, the Italian scientist who discovered the electrochemical process that makes galvanizing possible.

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