Yes, black pipe is OK for certain types of plumbing—mainly gas lines and some industrial applications. However, it's generally not recommended for water supply systems due to its susceptibility to corrosion.

What is Black Pipe?

Black pipe, commonly made of mild steel and coated with a dark iron oxide, is a strong and durable pipe widely used in industrial applications. It’s named for its black appearance—not because it contains any special material. Unlike galvanized pipe, it has no protective zinc coating, making it unsuitable for transporting water that could cause it to rust over time.

Common Uses of Black Pipe

While not ideal for residential plumbing systems involving water, black pipe is a reliable choice for specific plumbing applications, such as:

● Gas Supply Lines: The most common and safest application for black pipe is transporting natural gas or propane.

● Fire Sprinkler Systems: In dry systems, black pipe’s durability and cost-effectiveness make it a go-to material.

● HVAC Systems: It is sometimes used in heating systems, especially for high-pressure steam.

Why Black Pipe is Not Suitable for Potable Water

For plumbing involving drinking water or water supply lines, corrosion resistance is critical. Black pipe lacks the galvanized coating that prevents rust, meaning it can:

● Rust and contaminate water

● Reduce pipe lifespan

● Cause clogs and leaks

Using black pipe for water systems could lead to health and maintenance issues, making it a less favorable option for residential plumbing.