Products Description
It is a standard-sized steel pipe that has been coated in a layer of zinc to protect it from corrosion. The "2-inch" refers to its Nominal Pipe Size (NPS), which is roughly based on the inside diameter. Its actual physical dimensions are standardized and larger than 2 inches.
Galvanized Steel Pipe vs. Alternatives
| Feature | Galvanized Steel Pipe | Black Steel Pipe |
| Primary Use | Structure, Outdoor, Non-potable | Gas Lines, Fire Sprinklers |
| Corrosion Resistance | Good (External) | Poor (Rusts easily) |
| Weight | Very Heavy | Very Heavy |
| Cost | Moderate to High | Moderate |
Products Advantages
Corrosion Resistance: The zinc coating provides excellent protection against rust and corrosion compared to bare steel, especially outdoors.
High Strength and Durability: Very strong and can handle high mechanical impact and pressure.
Long Lifespan: When not exposed to constant moisture or specific chemicals, it can last 40-50 years or more.
Threadable: Can be easily threaded with standard pipe threads for connections using fittings, couplings, and elbows.
Fire Resistance: Non-combustible, making it suitable for fire sprinkler systems (though specific fire-rated sprinkler pipe is often used).
Products Applications
Plumbing (Historically): It was the standard for home water supply and drain lines for decades. Note: Its use for potable water is now often discouraged or prohibited by code in many areas due to the risk of corrosion and lead leaching from the zinc coating over time.
Structural Applications: Very commonly used for:
Handrails and guardrails
Scaffolding
Frames for structures, gates, and furniture
Support posts and columns
Industrial Applications: Conveying gases, compressed air, and other non-potable fluids where corrosion resistance is needed.
Outdoor Applications: Fencing, farm fencing (corrals), and outdoor construction where its zinc coating provides protection from the elements.
Electrical Conduit: To protect electrical wiring (though specific EMT or rigid conduit may have slightly different specifications).
FAQ
Q1: What does the "2-inch" measurement refer to?
A: It refers to the Nominal Pipe Size (NPS), which is a standardized name for the pipe. It is not the exact inside or outside diameter. For a 2-inch pipe:
The Outside Diameter (OD) is always 2.375 inches (60.3 mm).
The Inside Diameter (ID) gets smaller as the wall thickness increases (e.g., Schedule 40 vs. 80).
Q2: What are the different weights or schedules available?
A: The most common schedules are:
Schedule 40 (Standard): Wall thickness of 0.154 inches (3.9 mm). Common for structural and low-pressure applications.
Schedule 80 (Extra Strong): Wall thickness of 0.218 inches (5.5 mm). Used for higher-pressure systems.
Q3: Can I use 2-inch galvanized pipe for drinking water?
A: It is not recommended for new drinking water (potable) installations. While modern galvanizing processes can be lead-free, the primary issues are:
Internal Corrosion: Over time (20-50 years), the inside can rust, leading to reduced water flow and water discoloration.
Lead Risk: In older homes, the zinc coating may have contained lead, which can leach into the water.
Code Compliance: Most modern plumbing codes now prefer materials like CPVC, PEX, or copper for potable water.
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