Galvanized Steel Pipe 3/4

"3/4-inch" is a nominal size, meaning it's a name for the pipe, not its exact measurement. The actual outside diameter (OD) is standardized so it can fit with standard fittings

Material: Steel

Coating: Hot-dip galvanized with a layer of zinc for corrosion resistance.

Nominal Size: 3/4 inch (This refers to the approximate internal diameter, but the actual physical dimensions are larger).

Primary Use: Carrying water, gas, and other fluids; structural applications.

Key Feature: Extremely strong and durable, but susceptible to internal corrosion over decades.

Outside Diameter (OD): 1.050 inches

Schedule 40 Wall Thickness: 0.113 inches

Inside Diameter (ID) for Schedule 40: ~0.824 inches (This is what determines flow capacity).

Threads: Uses standard 3/4" National Pipe Taper (NPT) threads.

High Strength & Durability: Can withstand high pressure and physical impact.

Heat Resistance: Non-flammable and can handle very hot water, making it suitable for fire sprinkler systems.

Corrosion Resistance (External): The zinc coating provides excellent protection against rust from the outside environment.

Long Lifespan: When used for the right application, it can last 40-50 years or more.

Water Supply Lines: Historically the standard for residential and commercial potable (drinkable) water lines, especially for main supply lines and in older homes built before the 1980s.

Gas Lines: Commonly used for natural gas and propane distribution lines.

Structural Applications: Frequently used for handrails, guardrails, fence posts, scaffolding, and framework due to its strength and rust resistance.

Industrial Plumbing: Conveying non-potable water, air, and other chemicals where corrosion resistance is needed.

Outdoor Applications: Its zinc coating makes it suitable for exposed outdoor uses where it will get wet.

Q1: What does "3/4-inch" actually measure?

A: The "3/4-inch" is a nominal size, meaning it's a historical name, not an exact measurement. It roughly refers to the internal diameter. The actual physical dimensions are larger to accommodate the wall thickness:

Outside Diameter (OD): 1.050 inches

Inside Diameter (ID) for Schedule 40: Approximately 0.824 inches

Q2: What is it most commonly used for today?

A: Its primary uses have shifted over time:

Water Supply: Still found in older homes, but rarely used for new potable water projects due to corrosion issues.

Natural Gas and Propane Lines: A very common and code-approved material for gas distribution.

Structural Projects: Extremely popular for handrails, guardrails, fence posts, framework, and scaffolding due to its strength and external rust resistance.

Outdoor Applications: Anything exposed to the elements, like outdoor shower posts or support poles.

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