Pipe

A hollow cylindrical section primarily used to transport fluids (liquids or gases). Measured by nominal pipe size (NPS) and schedule (wall thickness).

Tube

Also a hollow section, but often used in structural or mechanical applications. Tubes are measured by outside diameter (OD) and wall thickness with tighter tolerances.

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Key Differences: Pipe vs. Tube

Feature Pipe Tube
Purpose Transporting fluids Structural, mechanical use
Measurement Nominal diameter (NPS) Actual OD and wall thickness
Tolerances Looser Tighter
Shapes Available Mostly round Round, square, rectangular
Cost Generally cheaper Slightly more expensive

Types of Pipes and Tubes

Based on Material

Carbon Steel, Stainless Steel (SS 304, SS 316, SS 310, etc.), Alloy Steel, Mild Steel (MS), Copper / Brass, Aluminum, PVC / CPVC / HDPE (non-metallic)

Based on Manufacturing Method

Seamless: No welds, higher strength; ideal for pressure applications.
Welded (ERW, HFIW, SAW, etc.): Economical, suitable for lower pressure or structural use.

Applications

Industry Pipe Use Tube Use
Oil & Gas Transporting oil, Gas, Steam Drilling tools, Casing
Construction Water Supply, Sewage Scaffolding, Support Frames
Automotive Exhaust Systems Fuel Lines, Structural Parts
HVAC Chillers, Ventilation Coils, Heat Exchangers
Medical NA Surgical Instruments
Furniture NA Frames, Rails, Legs