Spiral Submerged Arc Welded Line Pipe

Spiral Submerged Arc Welded Line Pipe Engineered for Long-Distance Pipelines and Heavy-Duty Infrastructure Spiral welded pipe combines continuous forming, double-sided submerged arc welding, and wide diameter flexibility. It is widely used in oil & gas transmission, municipal water supply,...

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Spiral Submerged Arc Welded Line Pipe

Engineered for Long-Distance Pipelines and Heavy-Duty Infrastructure

Spiral welded pipe combines continuous forming, double-sided submerged arc welding, and wide diameter flexibility. It is widely used in oil & gas transmission, municipal water supply, and structural piling applications - especially where cost efficiency and reliable mechanical performance are required.

Manufacturing Process

Strip preparation – uncoiling, leveling, edge milling

Spiral forming – continuous roll forming at optimized helix angle

Double-sided SAW – inner weld first, then outer weld

NDT – online UT + RT random inspection

Hydrostatic test – each pipe tested per standard

End finishing – beveling + anti-rust treatment

Technical Advantages (Comparison)

Item	SSAW Pipe	LSAW Pipe	ERW Pipe
O.D. range (mm)	219–3020	219–1800	21.3–660
Wall thickness (mm)	8.1–26.97	8–50	1.65–26.97
One strip width flexibility	High	Low	Low
Longitudinal stress capacity	Better than LSAW	Good	Moderate
Cost efficiency at large OD	Very high	Medium–High	Not suitable

Best cost-performance for large-diameter, medium/high-pressure pipelines.

Standards & Quality System

Product standards
API 5L PSL1, API 5L PSL2.

Quality control

Raw material verification

WPS/PQR qualification

100% UT + RT at pipe ends

Hydrostatic test (≥5 sec hold)

Dimensional inspection (ovality, wall thickness, bevel)

Optional services

3PE / FBE coating

End protectors

Traceable marking

Third-party inspection (BV, SGS, TÜV)

Applications & Reference Cases

Sector	Typical Use
Oil & gas	Long-distance transmission, gathering lines
Water	Raw water mains, trunk sewers
Industrial	Cooling water, slurry, chemical media
Structural	Bridge piles, marine pipe piles