API 5L X52 LSAW Steel Pipe: Manufacturing Capabilities & Product Specifications

Why Womic Steel for X52 LSAW?

● Three complementary processes (JCOE, UOE, rolled plate) covering diameters 219–1,600mm

● Thick wall capability up to 70mm (single seam) or 80mm (double seam) for high-pressure injection and arctic applications

● PWHT furnace capacity: 12m length × 3m diameter, plus induction heating for longer pipes

● Low-temperature impact testing down to -60°C (arctic grade X52)

● Sour service certified with HIC/SSC testing (NACE TM0284, TM0177)

● API 5L Monogram + CE + third-party inspection (SGS, BV, TÜV, DNV, ABS, LR)

● Quick turnaround: 30-45 days for standard X52 PSL1, 45-60 days for PSL2 sour service

● Long length up to 24m reduces field girth welds by 30-40% (typical 12m vs 18m vs 24m)

● Full traceability from plate heat number to finished pipe (heat number stamped on each pipe)

● Over 3,000 km of X52 pipelines supplied globally with zero in-service failure

Frequently Asked Questions:

Q: What is the main difference between X52 PSL1 and PSL2 for LSAW pipe?
A: PSL2 has tighter chemical composition limits (lower C, P, S), mandatory Charpy impact toughness (27J minimum @ 0°C or lower), maximum hardness limits (90 HRB), and requires more rigorous NDT (100% UT versus spot UT for PSL1). For high-pressure gas pipelines, offshore, or sour service, PSL2 is mandatory. For water lines or low-pressure oil, PSL1 is acceptable and more economical.

Q: Can you supply X52 with low-temperature impact testing for arctic projects?
A: Yes. We supply X52 PSL2 with Charpy impact testing at -46°C (min 27J) and DWTT at -20°C (min 85% shear area). We have supplied arctic grade X52 to Canadian and Russian projects. Please specify the required test temperature and energy when inquiring.

Q: What is the maximum wall thickness you can produce for X52 LSAW?
A: JCOE process max 50.8mm, UOE process max 40mm, rolled plate single seam up to 70mm, rolled plate double seam up to 80mm. For wall thickness beyond 50.8mm, PWHT is mandatory. We recently supplied X52 1,600mm OD × 70mm WT for a high-pressure water injection project in Oman.

Q: How do you control hardness for X52 sour service?
A: We control chemical composition (CEV ≤ 0.40% for sour service, lower than standard 0.43%), control heat input during SAW welding (≤ 3.0 kJ/mm), and apply PWHT for wall thickness ≥ 20mm. Hardness after PWHT is typically 78-85 HRB for base metal and 82-88 HRB for weld. We provide full hardness traverse documentation.

Q: Do you provide third-party inspection for X52 LSAW pipes?
A: Yes. We work with SGS, BV, TÜV, DNV, ABS, and LR. The inspection can be performed at our factory during production, witnessed by client's representative or third-party agency. We issue EN 10204 Type 3.2 certificates upon request.

Q: What is the typical lead time for X52 LSAW pipe?
A: Standard lead time: 30-45 days for PSL1, 45-60 days for PSL2 with sour service testing. Rush orders (20-30 days) possible for small quantities (<500 tons). For very large orders (>10,000 tons), lead time may extend to 75 days depending on plate availability.

Q: Can you supply X52 with 3LPE coating and concrete weight coating for offshore pipelines?
A: Yes. We supply 3LPE coating per ISO 21809 (2.5-3.5mm total thickness) and can coordinate concrete weight coating (40-120mm thickness, density 2,400-3,050 kg/m³) at our partner coating yard in Tianjin. We have supplied offshore coated X52 to Vietnam, Indonesia, and Middle East projects.

Project Reference – East Africa Crude Oil Export Pipeline

Country: Uganda / Tanzania (East African Crude Oil Pipeline – EACOP)
Standard & Grade: API 5L X52 PSL2 (sour service, with HIC and SSC testing)
Dimensions & Quantity:

● OD 610mm (24″) × WT 12.7mm – 48,000 meters (approx. 7,200 tons) manufactured by UOE process

● OD 610mm (24″) × WT 15.9mm – 12,000 meters (approx. 2,400 tons) manufactured by UOE process (thicker wall for river crossings)

● OD 914mm (36″) × WT 19.0mm – 8,500 meters (approx. 3,400 tons) manufactured by JCOE process for pump station bypass lines
Total: 68,500 meters (68.5 km), approx. 13,000 tons

Specifications: External 3LPE coating (3.0mm total thickness) per ISO 21809, beveled ends 30° / 1.6mm root face, hydrotest at 11.5 MPa (design pressure 8.5 MPa). Mandatory Charpy impact at 0°C (min 27J, achieved 85-120J). HIC per NACE TM0284 Solution A, 96h – acceptance: CLR ≤ 5%, CTR ≤ 1.5%, CSR ≤ 0.5%. SSC per NACE TM0177 Method A, 720h – no cracking allowed. PWHT applied for all pipes with WT ≥ 15.9mm.

Application: Crude oil export pipeline from landlocked Uganda (Hoima region) to Tanzania's Tanga port on the Indian Ocean. Total pipeline length 1,443 km. Womic Steel supplied 68.5 km of the total, including sections through sensitive wildlife areas and major river crossings.

Technical Challenges & Solutions:

● Sour service compliance for crude oil with H₂S – The Ugandan crude contains dissolved H₂S up to 15 ppm with water content. Stringent HIC and SSC testing was required. Womic performed qualification testing on 15 production lots. All passed with CLR 0%, CTR 0%, CSR 0% for HIC. SSC testing (NACE TM0177, 720h) showed no surface cracking. We achieved this by keeping CEV ≤ 0.38% (well below PSL2 limit of 0.43%) and applying PWHT for all pipes above 12.7mm WT, even though API 5L does not mandate PWHT below 25.4mm. Client's inspector (SGS) witnessed all testing.

● Wildlife area environmental constraints – The pipeline passes through two national game reserves. Coating damage during installation would be difficult to repair due to restricted access. Womic applied a sacrificial layer of polyethylene (extra 0.5mm on top of standard 3LPE) as an abrasion-resistant overcoat. We also performed 100% holiday detection at 7kV (standard is 5kV) to ensure zero coating holidays. Peel strength tested at 250 N/cm at 25°C, 150 N/cm at 70°C.

● River crossings requiring thicker wall – Five major river crossings (Nile tributaries) required WT 15.9mm instead of 12.7mm for additional collapse resistance and bending allowance during sagbend installation. For these thicker wall pipes, we used UOE process for better roundness (±0.2% OD) to ensure reliable field girth welding in the crossing sections. Ovality was measured at 0.15-0.18%, well below the 0.5% limit.

● Long distance overland logistics – Pipes were shipped from Shanghai to Dar es Salaam port (Tanzania), then trucked 1,200 km to the Uganda pipeline spread. Road conditions in western Tanzania include unpaved sections. Womic designed a special shipment plan: 12m lengths only (no 18m joints for the Uganda section) to fit standard flatbed trucks. Each pipe was individually strapped with padded slings. We provided loading diagrams and training to the local trucking company. Zero pipes were damaged during the 1,200 km overland transit.

● Stringent documentation and traceability – The project required EN 10204 Type 3.2 certificates for every heat number, with full traceability from plate to finished pipe. Womic assigned a dedicated document controller who tracked all 68.5 km of pipes. Each pipe was stamped with heat number, pipe number, and GPS coordinates of production. The client's QA team audited our facility twice during production; both audits passed with zero non-conformances.

Result: The East African Crude Oil Pipeline (EACOP) is scheduled for mechanical completion in Q2 2025. Womic Steel's 13,000 tons of X52 PSL2 pipes were delivered over 8 months (first shipment October 2023, final shipment May 2024). All pipes passed third-party inspection by SGS Tanzania. The client (a consortium of international oil companies) issued a letter of commendation for Womic's quality control and on-time delivery. Womic is now a pre-qualified supplier for future pipeline expansions in the region.

Contact:
Website: www.womicsteel.com
E-mail: sales@womicsteel.com

Tel / WhatsApp / WeChat:
Victor: +86 15575100681
Jack: +86 18390957568

Womic Steel – Your reliable partner for API 5L X52 LSAW pipes for high-pressure oil and gas trunk lines, sour service, arctic pipelines, and offshore applications worldwide.