1 Inch Galvanized Steel Pipe

It is a standard-sized steel pipe with a zinc coating for corrosion resistance. The "1-inch" is its Nominal Pipe Size (NPS), which is a standardized name and does not refer to its exact physical dimensions.

Nominal Pipe Size (NPS): 1 inch

Schedule (Wall Thickness):

Schedule 40 (Standard): Most common for general use.

Schedule 80 (Extra Strong): Used for higher pressure applications.

Actual Outside Diameter (OD): 1.315 inches (33.4 mm). This is constant for all schedules.

Actual Inside Diameter (ID): Varies by schedule.

Schedule 40: ID = 1.049 inches (26.6 mm)

Schedule 80: ID = 0.957 inches (24.3 mm)

Corrosion Resistance: Zinc coating protects against rust.

High Strength: Can handle significant structural loads and pressure.

Durability: Very long lifespan, especially indoors.

Threadable: Easy to connect with standard threaded fittings.

Q: Can I use 1-inch galvanized pipe for natural gas?
A: This is a nuanced question. Black steel pipe is the standard for gas lines because the zinc coating on galvanized pipe can flake off over time and clog orifices in gas valves and appliances. Some local codes prohibit it entirely. Always, always consult your local building code and a licensed professional before using it for gas. It is never a DIY decision for a gas line.

Q: What's the difference between 1" galvanized pipe and 1" EMT conduit?
A: EMT (Electrical Metallic Tubing) is thin-walled and not threaded. It is not designed for pressure or structural weight. Galvanized Rigid Conduit (GRC) looks like pipe but is made to different dimensional standards (ASTM A105). While often interchangeable for non-critical structural uses, you should not use electrical conduit for plumbing or gas.

Q: How do I connect it to modern PEX plumbing?
A: You need a transition fitting. The most common method is to use a ** galvanized male or female threaded adapter**. You screw this into an existing fitting or onto the pipe, and then connect a PEX female threaded adapter to it, creating a secure, leak-free transition between the two materials.

Q: Why is the inside of my old water pipe so narrow?
A: This is a classic sign of internal corrosion and mineral scale buildup (rust, calcium, lime). Over decades, this buildup can reduce a 1-inch pipe's effective ID to the size of a pencil, severely restricting water flow. This is a primary reason it is no longer used for new water lines.

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