All pipes mentioned in this article are sold by our company.
Engineers quickly encounter a practical issue: even for large-diameter steel pipes, quotes can vary significantly. Some are labeled LSAW pipes, others SSAW pipes. While they look similar on the outside, their performance may differ. Focusing solely on price can easily lead to pitfalls. If you truly aim to execute a project well, you’ll eventually need to understand the LSAW vs SSAW distinction.
LSAW vs SSAW Comprehensive Comparison
The main difference between LSAW and SSAW processes lies in the steel sheet forming. LSAW involves forming the steel sheet longitudinally, while SSAW involves rolling the steel sheet into a spiral shape before welding. Furthermore, the two processes differ significantly in production efficiency, structural strength, and cost.
LSAW vs SSAW Diameter Range
LSAW ：20 inches to 100 inches
SSAW：16 inches to 60 inches
LSAW vs SSAW Manufacturing Costs
LSAW ：Relatively expensive
SSAW：Cheap
Pressure level
LSAW ：Can withstand high pressure
SSAW：Only able to withstand medium and low pressure
General Standards
LSAW ：API 5L、EN10219、ISO 3183
SSAW：API 5L、SY/T5037
Dimensional Wall Thickness Accuracy
LSAW ：Accurate
SSAW：Unevenness varies depending on the helix angle.
LSAW PIPE
SSAW PIPE
LSAW Pipe vs SSAW Pipe
LSAW vs SSAW - LSAW Characteristics and Processes
LSAW stands for Longitudinal Submerged Arc Welded Pipe, also known as SAWL pipe. Its characteristic is that the weld seam is a straight line parallel to the pipe axis. LSAW also comes in two forms: UOE LSAW Pipe and JCOE LSAW Pipe.
UOE LSAW Pipe
JCOE LSAW Pipe
LSAW vs SSAW - SSAW Characteristics and Processes
SSAW stands for Spiral Submerged Arc Welded Pipe, and its characteristic is that the weld is a spiral line wrapped around the pipe.
What Are the Advantages of LSAW over SSAW
1. SSAW pipes have high residual stress, while LASW pipes, due to uniform diameter expansion, have very limited residual stress.
2. Because SSAW pipes are formed and welded simultaneously, inspection is impossible. LASW pipes, however, are formed first and then welded, allowing for comprehensive inspection during the process to ensure quality.
3. SSAW pipes have spiral welds, while LASW pipes have straight welds. LSAW pipes have significantly fewer welds than SSAW pipes.
4. SSAW pipes exhibit severe stress concentration in the welds, resulting in a large heat-affected zone, making them most susceptible to cracking and other failure effects.
5. LSAW pipes have high dimensional accuracy, while SSAW pipes have slightly lower dimensional accuracy. Higher accuracy leads to easier installation.
6. LSAW pipes can undergo non-destructive testing, but to determine the quality of SSAW pipes, destructive testing methods are required.
When to Use LSAW/ SSAW Pipe
When to Choose LSAW Pipe？
- If the environment is high-pressure, requires high-precision dimensions, the fluid is critical such as oil and natural gas, and it needs to meet international pipeline standards.
- Examples: long-distance oil and gas pipelines, marine engineering, urban gas and high-pressure water pipeline networks.
When to Choose SSAW Pipe？
- If your environment is low to medium pressure, your budget is limited, the fluid is not critical, and the application is not structural, you can confidently choose SSAW pipes.
- Examples include: urban drainage systems, structural columns or foundations, urban gas and high-pressure water networks, and pipe piles/foundations.
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