Longitudinal Submerged ARC Welded (LSAW) Pipe
Our high-quality LSAW steel pipe are manufactured from single steel plates formed via UOE, JCOE, or RBE processes, and welded longitudinally using double-sided multi-wire automatic submerged arc welding (SAW). Featuring excellent weld quality, precise dimensions, high pressure resistance, superior fatigue strength, and wide wall thickness range, these pipes are widely used in high-pressure oil & gas transmission lines, subsea pipelines, offshore platforms, industrial pressure systems, and urban main networks-where safety and reliability are paramount.
Compared to spiral-welded (SSAW) pipes, LSAW steel pipe have a straight seam, offering more uniform stress distribution, shorter weld length, and better dimensional stability, making them ideal for critical infrastructure and energy transportation projects.
Key Features
Standards:
International:
API 5L (46th Ed. or later): PSL1 & PSL2 grades from A25 to X80;
ISO 3183: Equivalent to API 5L, used globally;
ASTM A671/A672: For atmospheric and pressure services in power/chemical plants;
DNV-ST-F101: Design standard for subsea pipelines;
ASTM A691 – Standard Specification for Carbon and Alloy Steel Pipe, Electric-Fusion-Welded for High-Pressure Service at High Temperatures
Chinese:
GB/T 9711 (Equivalent to API 5L, PSL1/PSL2);
SY/T 5037 (Reference standard);
GB 50369 (Construction & acceptance for pipelines);
Custom: Available per MDS, technical specification, or ASME B31.3/B31.8.
Materials:
A671/672 Gr 50, 60, 70; 1-1/4CR, 2-1/4CR, 5CR, 9CR, 91; ASTM A573 Grades 60, 65, 70
ASTM A516 Grade 60/65/70; AH36, DH36, EH36;S355JO, S355J2, S355K2
Carbon & Low-Alloy Linepipe Steels:
L245–L555, X60–X80 (API 5L PSL1/PSL2);
Special Requirements:
Sour Service: L450QS, X65QS (NACE MR0175 / ISO 15156 compliant);
Low-Temperature Toughness: Impact tested at -20°C to -60°C (e.g., X70W, X80W);
Z-Toughness: Z15/Z25/Z35 plates for resistance to lamellar tearing;
Steel plates sourced from Baosteel, Ansteel, Shougang, WISCO, ensuring stable chemistry and mechanical properties.
Dimensions:
OD: 219 mm – 11000 mm (8" – 433")
WT: 6 mm – 180 mm (thicker on request)
Length: Fixed (6m, 12m), up to 13.5m , or 150 meters Max
Tolerances (API 5L PSL2 / GB/T 9711):
OD: ±0.5% × OD or ±0.75mm (whichever is greater)
WT: +10% / -10%
Ovality: ≤0.5% × OD
Straightness: ≤0.2% of length
Forming Process: UOE (high precision), JCOE (cost-effective), RBE (small batch)
Applications:
Oil & Gas Pipelines: Onshore/subsea crude, gas, refined products;
Urban Gas Networks: High-pressure transmission mains;
Offshore Engineering: Jackets, piles, risers, subsea lines;
Power & Water: Hydroelectric penstocks, pressure tunnels;
Industrial Systems: High-pressure steam, process lines;
Infrastructure: Bridges, tunnels, port piles.
Certifications:
Classification Society Approvals:
CCS, ABS, DNV, BV, LR, NK material & factory approval
MTC (Type 3.1/3.2) with class stamp, third-party inspection supported
End-User & EPC Qualifications:
Owners: CNPC, CNOOC, Sinopec, PipeChina, Shell, BP, TotalEnergies, ADNOC, Saudi Aramco
EPCs: CPECC, COOEC, Fluor, Bechtel, TechnipFMC, Saipem, Worley, Linde
Successfully supplied to China-Russia East-Route, Central Asia Gas Pipeline, China-Myanmar Pipeline, Middle East LNG, Southeast Asia offshore platforms.
Quality & System Certifications:
API 5L Monogram License
ISO 9001:2015, ISO 14001:2015, ISO 45001:2018
PED 2010/35/EU (CE Mark)
NACE MR0175 / ISO 15156 (Sour Service)
Full Traceability: From plate heat number to final inspection data
Common Customer Questions (Q&A Format)
Q: Are your straight-seam pipes SAW welded? How do they differ from SSAW pipes?
A: Yes, using double-sided multi-wire SAW. LSAW has a straight seam with shorter weld length, lower stress concentration, and better dimensional accuracy-ideal for high-pressure, high-safety applications.
Q: Do you comply with API 5L PSL2? Can you provide full test reports?
A: Yes, fully compliant. We provide complete reports: chemistry, tensile, impact (ambient/low-temp), bend, flattening, hardness, grain size, DWTT.
Q: What is your maximum OD and wall thickness?
A: Max OD: 11000mm (433"), WT: 180mm.
Q: Can you supply X70 or X80 grade? What about low-temperature toughness?
A: Yes, grades up to X80 available. Impact tested at -20°C, -40°C, or lower for arctic/deep-sea conditions.
Q: Are you approved by BP, KOC, ADNOC and other Oil, Gas company ?
A: Yes, technically qualified by BP,KOC,ADNOC, SAUDI ARAMCO, CNOOC, CNPC, SINOPEC,IOGC, CRCC listed in approved vendor lists.
Q: What is the lead time? Do you have stock for common sizes?
A: Lead time: 45–75 days. Common urban pipeline sizes (Grb-X52 DN500–DN900) partially in stock.
Q: Do you provide NDT reports (UT, RT, MT, PT)?
A: Yes. All welds inspected by UT and RT, ends by MT or PT, ensuring defect-free integrity.
Q: Can you manufacture per customer MDS or SPEC?
A: Yes. Custom production per MDS, SPEC, drawing, including special grades, tolerances, FBE/3LPE coating, cement lining.
Q: Suitable for offshore jacket or pile applications? Can you support class survey?
A: Yes. Widely used in offshore structures. We support inspections by CCS, ABS, DNV, and provide compliance documentation.
Q: What is your export packaging? Does it meet international site requirements?
A: Rust preventive oil, plastic end caps, steel strapping, marine frames. Each pipe marked with grade, heat no., size, standard-compliant with API RP 5L1 and international project specs.
Hot Tags: lsaw steel pipe, China lsaw steel pipe manufacturers, suppliers, factory, Hollow Section, LSAW PIPE, spiral seam welded pipe, steel pipe weld fittings, steel pipe, p110 casing
