What are sizes of SSAW steel pipes?

Spiral Submerged Arc Welded (SSAW) steel pipes are widely used in oil & gas, water transmission, and structural engineering projects due to their ability to support large diameters and medium-to-thick wall designs. Pipe size is typically defined by outside diameter (OD) and wall thickness, making it flexible for different pressure and flow requirements.

The common SSAW steel pipe size range is:

Outer diameter: 406 mm – 2540 mm (16" – 100")

Wall thickness: 6 mm – 25.4 mm (can be higher for customization)

Custom dimensions are available for specific engineering requirements.

1. Small to Medium SSAW Pipe Sizes (16"–36")

This range is widely used in municipal and standard industrial systems.

Typical applications:

Urban water supply and drainage

Low to medium-pressure oil and gas pipelines

General infrastructure projects

Size overview:

16"–20" (406–508 mm): Small municipal pipelines, easy installation

24"–36" (610–914 mm): Medium-pressure transmission and structural use

This range balances cost, handling efficiency, and mechanical strength.

2. Large Diameter SSAW Pipe Sizes (40"–100")

Large-diameter SSAW pipes are designed for high-capacity fluid transport and heavy engineering structures.

Typical applications:

Long-distance oil and gas transmission

Large water diversion projects

Offshore and structural foundations

Size overview:

40"–60" (1016–1524 mm): High-flow pipelines and trunk lines

72"–100" (1820–2540 mm): Ultra-large custom projects and offshore structures

These pipes are usually project-specific and fully customized.

3. SSAW Steel Pipe Size Chart (Common Specifications)

4. Factors Affecting SSAW Pipe Size Selection

1. Flow Rate Requirement

Larger diameters provide higher flow capacity but increase material cost and installation space requirements.

2. Operating Pressure

Higher pressure systems require thicker wall designs to ensure structural safety.

3. Application Type

Fluid transport focuses on pressure resistance and flow efficiency

Structural use focuses on stiffness and load-bearing performance

4. Project Cost

Pipe diameter and wall thickness directly affect material cost. In large projects, lifecycle cost (energy + maintenance) is more important than initial price.

5. Applications of SSAW Steel Pipes

Oil & Gas Transmission

SSAW pipes are widely used in long-distance pipelines due to high strength and compatibility with anti-corrosion coatings such as 3PE.

Water Supply & Drainage

Used in urban water systems and diversion projects, offering smooth flow and strong external pressure resistance.

Structural Engineering

Applied in bridge piles, building foundations, and offshore platforms due to high load-bearing capacity.

Industrial Applications

Used in mining slurry pipelines, power plant water systems, and general industrial transport lines.

6. SSAW vs ERW Steel Pipes

ERW pipes: Suitable for small diameters (typically ≤24"), with high precision and lower cost

SSAW pipes: Suitable for large diameters and medium-thick walls with high flexibility

General selection rule:

≤24" → ERW preferred

24"→SSAW preferred

7. Limitations of SSAW Steel Pipes

SSAW pipes are not ideal in some conditions:

High-pressure gas transmission (often LSAW is preferred)

Small-diameter pipelines (<16")

Highly corrosive environments without proper internal/external coating

FAQ

1. What is the standard size range of SSAW steel pipes?

SSAW pipes typically range from 406 mm to 2540 mm in outer diameter.

2. What is the most commonly used SSAW pipe size?

Sizes between 24" and 60" are most commonly used in industrial and pipeline projects.

3. Can SSAW pipes be customized?

Yes, SSAW pipes support customized diameter, wall thickness, and steel grades.

4. What is the main advantage of SSAW pipes?

They are suitable for large-diameter pipelines with flexible size and cost efficiency.

5. Where are SSAW steel pipes mainly used?

They are widely used in oil & gas, water transmission, structural foundations, and industrial systems.