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Industries OverviewThe company's products are primarily used in industrial equipment sectors such as nuclear power, petroleum, petrochemicals, chemical engineering, power generation, automotive manufacturing, shipbuilding, fertilizer production, pharmaceuticals, papermaking, sugar refining, and machinery manufacturing. -
Products & SolutionsOur Products: Ferrous metal ore raw materials (nickel ore, ferronickel, ferrochrome, ferromanganese, ferrosilicon, etc.), seamless pipes, welded pipes, medium-thick plates, plate coils, bars, wire rods, wire coils, pipe fittings, flanges, castings, etc. -
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About UsTsisco Industrial Ltd. was established in 2010. Originating from the Tsingshan ecosystem’s Shanghai platform, the company now operates independently and focuses on global supply-chain integration, distribution, and import/export of steel and alloy materials. We achieved ISO 9001 certification from TÜV Rheinland in 2012, and ISO 9001, ISO 14001 and ISO 45001 certifications from LRQA in 2022. These accreditations underpin continuous improvement and stable performance in quality, environment, and occupational health & safety.
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Products & Solutions
Submerged Arc Welded Pipes
Submerged Arc Welded Pipes
Submerged Arc Welded Pipes | Global Sourcing for Engineering & Procurement
1.0 Product Positioning and Application Scope
1.1 Submerged arc welded (SAW) pipes are large-diameter steel pipes welded by inner and outer submerged arc welding. Based on the seam geometry and manufacturing process, they are broadly classified into two main categories: Longitudinal Submerged Arc Welded (LSAW) pipes and Spiral Submerged Arc Welded (SSAW) pipes.
1.2 LSAW pipes are manufactured from individual heavy steel plates, resulting in a single straight longitudinal seam. Within LSAW, there are two primary forming methods: the UOE process (U-ing, O-ing, Expanding), which is highly efficient and designed for mass production of standardized trunk lines; and the JCOE process (progressive J-ing, C-ing, O-ing, Expanding), which offers high flexibility for manufacturing ultra-thick, customized, or smaller-batch project pipes. LSAW pipes are characterized by their ability to achieve extreme wall thicknesses and withstand very high internal pressures, making them the mandated choice for critical high-pressure oil and gas trunk lines, harsh offshore services, and extreme environments.
1.3 SSAW pipes are formed continuously from hot-rolled steel coils with a helical (spiral) seam. This production method allows for cost-efficient manufacturing of extremely large diameter pipes from relatively narrower coils. They offer broad diameter coverage, cost efficiency and flexible lengths, and are highly suitable for long-distance water transmission, onshore crude oil and natural gas pipelines (subject to design checks), seawater intake and outfall as well as cooling water, piling and structural uses, city gas trunk mains, and sewage/slurry conveyance.
1.4 Follow the project specification and design check as the governing principle when selecting between LSAW (UOE/JCOE) and SSAW. AWWA C200 (water), ISO 3183 and API 5L (line pipe), EN 10224 (water) and SY/T 5037 (ordinary fluid service in China) are the mainstream standards for this product family.
2.0 Standards Matrix (by application system)
2.1 Water and municipal: AWWA C200 for steel water pipe; C205 cement-mortar lining; C210 epoxy lining/coating for potable and general water; C213 fusion-bonded epoxy (FBE); C214/C215 tape wrap; C222 polyurethane. Design guidance: AWWA M11.
2.2 Oil & gas: API 5L line pipe (PSL1/PSL2), ISO 3183 (companion/intended equivalent to API 5L), often combined with ASME B31.4/B31.8 and API 1104 for construction and acceptance.
2.3 European & international general: EN 10224 for drinking and general water; EN 10217 series for welded pressure tubes (project-based); ISO 21809 pipeline coatings (e.g., 3LPE/3LPP and FBE) and ISO 21809-3 for field joint coatings.
2.4 China & North America: GB/T 9711 for oil & gas transportation; SY/T 5037 for ordinary fluid service SAW pipes; AWWA family per item (2.1). Canada may follow CSA Z245.1 aligned with ISO 3183 (project-based).
3.0 Scene–Material–Standard–Size Mapping
3.1 Raw and treated water trunk mains (buried or on pipe racks): Material: Carbon line pipe grades L245–L415 (GB/T 9711) or API 5L Grade B–X60. Standards: AWWA C200 + C205 lining, external C213 or 3LPE; or EN 10224 + ISO 21809. Size: DN 800–DN 3000 typical; WT 6–20 mm; length 6–18 m.
3.2 Seawater intake/outfall and industrial cooling water: Material: L290–L450; control S and toughness as required. Standards: AWWA C200 + C210 epoxy (or C205 mortar) internally; 3LPE/3LPP externally + cathodic protection. Size: DN 600–DN 2600; wall thickness by surge/external pressure checks.
3.3 Onshore crude oil & natural gas trunk lines (medium to high pressure): Material: API 5L PSL2 X52–X70 (or GB/T 9711 L360–L485) with toughness matching. Standards: API 5L/ISO 3183 PSL2 (Charpy, DWTT, CTOD per project); external ISO 21809 system. Size: OD 508–1422 mm common; WT 6.4–25.4 mm (LSAW preferred for highest pressures).
3.4 City gas trunk and district energy networks (medium pressure): Material: L245–L360 or API 5L Grade B–X52. Standards: API 5L PSL1/PSL2 or AWWA C200 depending on medium and regulation; coating and flanging per local codes. Size: DN 400–DN 1200.
3.5 Sewage, slurry and tailings: Material: L245–L360; heavy-wall for abrasion; optional polyurethane or ceramic lining. Standards: AWWA C200 + C222 polyurethane or project lining spec. Size: DN 400–DN 1800.
3.6 Offshore & near-shore piling, conductors and structural members: Material: S355JR/J2, API 5L X52–X65 per structural/fatigue criteria; expand and circumferential UT as required. Standards: Project structural codes (e.g., DNV) + manufacturing/NDE clauses; critical offshore pipelines may mandate LSAW while standard piling often utilizes SSAW. Size: OD 914–3000 mm; WT 12–40 mm (by design).
3.7 District cooling/heating return mains: Material: L245–L360. Standards: AWWA C200 + C210 or C205; external C213 or 3LPE, add insulation if needed. Size: DN 400–DN 1600.
3.8 Special cases (siphons across rivers, vacuum/negative pressure segments): Material: Thicker section with stiffeners by FEA. Standards: AWWA M11/project special; stability checks for external pressure/vacuum.
4.0 Size Range and Tolerances
4.1 OD: typically 406–3620 mm; some mills up to ~4064 mm.
4.2 WT: ~4.0–25.4 mm (by grade and service, LSAW can exceed these WT limits).
4.3 Length: 6–18 m (project cut lengths available).
4.4 Ends: bevel per ASME B16.25.
4.5 Dimensional and geometric tolerances follow the adopted standards, e.g., API 5L/ISO 3183 on wall thickness minus tolerance, OD/out-of-roundness, straightness and end squareness; AWWA C200 and EN 10224 contain corresponding clauses.
5.0 Manufacturing Flow and Key Controls
5.1 Manufacturing Flow: Coil/plate -> edge milling -> pipe forming (UOE or JCOE process for LSAW; continuous helical forming for SSAW) -> inner & outer SAW -> on-line UT/RT of seam -> expansion & sizing (as applicable) -> hydrotest -> end beveling -> dimensional & visual checks -> internal lining/external coating (as applicable) -> marking & packing.
5.2 Critical controls: plate/coil cleanliness and chemistry consistency; heat input and qualified WPS/PQR; PSL2 toughness and DWTT where required; 100% hydro and 100% weld NDE coverage; mechanical expansion to control residual stress; coating/lining DFT and holiday testing per AWWA/ISO 21809.
6.0 Quality Inspection and Documentation
6.1 Scope includes chemistry and mechanicals, impact (PSL2/project), DWTT (large OD oil & gas), dimensions/geometry, full-length hydro, weld UT/RT/MT, coating/lining DFT and holiday tests.
6.2 Documentation: EN 10204 3.1/3.2, welding/heat-treat records, NDE reports, hydro records, coating QA/QC and third-party witnessing if required.
7.0 Supply Forms and Packing
7.1 Supplied as bare pipes or beveled pipes, with end rings or spools; internal mortar (C205) or epoxy (C210); external FBE (C213), 3LPE (ISO 21809), tape wrap (C214/C215) or polyurethane (C222).
7.2 Protection with end caps, lifting/stacking bracing, anti-scuffing pads and full traceable marking.
8.0 RFQ/PO Checklist
8.1 Standard & edition: AWWA C200 + C205/C210/C213 (or API 5L/ISO 3183 PSL level, EN 10224, etc.).
8.2 Grade & condition: L245–L555 (GB/T 9711) or Grade B–X70 (API 5L), PSL2 yes/no, expansion yes/no.
8.3 Type & Dimensions: Specify LSAW (UOE/JCOE) or SSAW; OD × WT × length; bevel per ASME B16.25; limits on out-of-roundness, straightness and end squareness.
8.4 NDE & tests: 100% weld UT (or RT), full-length hydro, impact/DWTT ratio per drawings.
8.5 Lining & coating: system/standard, target DFT, adhesion and holiday acceptance.
8.6 Documentation & surveillance: EN 10204 3.1/3.2, TPI, dossier list.
9.0 Selection Guide
9.1 Water & reuse lines: AWWA C200 + C205; external C213 or 3LPE; DN 800–DN 3000 (SSAW is most common).
9.2 Seawater/high chlorides: C200 + C210 or C205 + 3LPP, with cathodic protection; match corrosion resistance of flanges/bolting.
9.3 Onshore O&G: API 5L PSL2 X52–X70; ISO 21809 external; DWTT per design (LSAW for high pressure, SSAW for medium pressure per owner approval).
9.4 Sewage & slurry: heavy-wall with C222 or project lining spec.
9.5 Offshore piling/structural: follow DNV/project structural codes; consider fatigue & welding details.
10.0 Procurement, Construction & O&M Risk Notes
10.1 Do not confuse AWWA Class with ASME Class; do not mix gasket/flange systems.
10.2 PSL1 vs PSL2 have significant differences; use PSL2 for trunk O&G lines.
10.3 Buried lines require cathodic protection and insulating joints; coatings do not replace CP.
10.4 Negative/external pressure without stability checks can lead to collapse; siphons need special design.
10.5 Field joints and repairs must follow ISO 21809-3 or AWWA rules to avoid bare steel exposure.
11.0 Representative Spec Lines (ready to paste)
11.1 Raw-water transmission: “Pipe, SSAW, AWWA C200, DN 1600, L = 12 m; C205 cement-mortar lining; external AWWA C213 FBE prime + 3LPE; bevel per ASME B16.25; hydro ≥1.5×DP; holiday-free; docs EN 10204 3.2.”
11.2 Onshore O&G trunk line: “Line Pipe, LSAW (UOE), API 5L PSL2 X65, OD 914 mm×WT 17.5 mm×L12 m; 100% weld UT; impact & DWTT per drawings; external ISO 21809-1 3LPE; holiday-free; docs 3.2.”
11.3 Seawater intake/discharge: “Pipe, SAW, AWWA C200, DN 2200; internal AWWA C210 epoxy; external 3LPP; CP by EPC; flanges per EN 1092; docs 3.1.”
11.4 Piling: “Pile Pipe, SSAW, S355J2, OD 2000 mm×WT 20 mm×L18 m; circumferential weld UT; end stiffening ring; coating per project marine system.”
12.0 Representative Global Producers (alphabetical, examples)
12.1 American SAW Pipe (USA, AWWA water transmission).
12.2 Borusan Mannesmann (Türkiye, SAW portfolio).
12.3 Corinth Pipeworks (Greece, LSAW/SSAW pipelines).
12.4 East Pipes Integrated Company (Saudi Arabia, SAW for water & O&G).
12.5 Jindal SAW (India, LSAW/SSAW for pipelines & water).
12.6 Northwest Pipe Company (USA, AWWA C200 submerged arc welded steel water pipe).
12.7 Welspun Corp (India, global LSAW/SSAW projects).
12.8 Erciyas Steel Pipe (Türkiye, large-diameter SAW).
Submerged Arc Welded Pipes | Technical Specifications
1.0 Definition & Scope
1.1 SAW pipes are welded by internal and external submerged arc processes. Based on the manufacturing method and seam orientation, they are essentially divided into two sub-types (1.2 and 1.3):
1.2 LSAW Pipes (Longitudinal Submerged Arc Welded): Produced from discrete steel plates resulting in a single straight longitudinal weld seam. Based on the specific forming process, LSAW is primarily divided into UOE and JCOE:
1.2.1 UOE Process: Formed by a U-press, an O-press, and subsequent mechanical Expansion. It is highly efficient and ideal for high-volume, uniform pipeline projects.
1.2.2 JCOE Process: Formed progressively into J, C, and O shapes, followed by mechanical Expansion. It provides excellent manufacturing flexibility, ideal for ultra-thick walls, customized dimensions, and diverse-diameter project production.
1.2.3 These LSAW pipes excel in high-pressure containment and demanding applications such as subsea pipelines, extreme high-pressure oil and gas trunklines, and heavy-duty offshore structures.
1.3 SSAW Pipes (Spiral Submerged Arc Welded): Manufactured continuously from hot-rolled steel coils rolled at a helical angle, creating a spiral weld seam. This process provides excellent cost-efficiency and flexibility in producing exceptionally large outside diameters.
1.4 Collectively, SAW pipes suit large OD, medium-to-thick wall transmission and structural applications: long-distance water/return lines, crude/product pipelines (LSAW preferred, SSAW subject to Owner approval), piles for ports/bridges, structural columns/casings, offshore conductors/protective piles, etc.
2.0 Standards Matrix (by application/region)
2.1 Line pipe: API 5L (PSL1/PSL2) / ISO 3183; China GB/T 9711 (L245–L555); Canada CSA Z245.1; offshore refer to DNV-ST-F101 where applicable.
2.2 Water works: AWWA C200 (steel water pipe≥150 mm); linings/coatings per AWWA C205/C210/C213/C222.
2.3 Piles/Structural: ASTM A252, JIS A5525; structural hollow sections per EN 10219.
2.4 General fluids: SY/T 5037, GB/T 3091 (low/medium pressure).
2.5 Factory coatings: DIN 30670 (3LPE), DIN 30678 (3LPP), CSA Z245.20 (FBE), AWWA C210/C213/C222; (projects may reference ISO 21809 family as an umbrella).
3.0 Materials & Grades
3.1 Line pipe: B/L245, X42/L290, X46/L320, X52/L360, X56/L390, X60/L415, X65/L450, X70/L485 (X80/L555 subject to dedicated qualification).
3.2 Pile/Structural: Q235/Q345/S355; ASTM A252 Gr.2/Gr.3.
3.3 Coil/Plate requirements: low P/S and inclusion control; tensile/impact to spec; microalloying (Nb/V/Ti) balanced with weldability (CE/CET).
4.0 Manufacturing & Process Controls (typical SAW route)
4.1 Coil/Plate incoming inspection (chemistry, tensile, UT for lamination).
4.2 Plate edge milling (LSAW) or Coil uncoiling/leveling/slitting (SSAW); edge quality control.
4.3 Edge milling for stable fit-up land and gap.
4.4 Pipe forming: For LSAW, utilizing either the U-ing and O-ing sequence (UOE process) or progressive J-C-O bending (JCOE process); For SSAW, utilizing continuous helical forming.
4.5 Double-sided SAW (ID then OD), flux baking and reuse control; HI/interpass governed.
4.6 In-line/off-line NDE: full-length UT of seam; RT/DR where required; body UT sampling.
4.7 Mechanical expansion/sizing to reduce residual stress and ovality (standard for LSAW UOE/JCOE, optional/project-specific for SSAW).
4.8 Hydrotest per standard (stress/hold/acceptance).
4.9 End finishing: 30°±2.5°bevel with ~1.6 mm land (project/standard prevailing); spatter removal.
4.10 Coating/lining as ordered (3LPE/3LPP/FBE/liquid epoxy/cement mortar).
4.11 Marking & traceability: heat/lot, grade/PSL, dimensions, inspection status, coating system/thickness.
5.0 Size Range & Tolerances (typical; PO prevails)
5.1 OD ≈ 219–3620 mm (SSAW mills up to ~4064 mm, LSAW typically up to ~1422 mm or 56 inches).
5.2 WT≈5–25.4 mm (SSAW piles up to ~40 mm; LSAW can reach 50mm+ depending on mill/grade/process).
5.3 Length 6–12 m (SRL/DRL), up to ~18 m; longer by field joints.
5.4 Typical tolerances: OD ±0.5%·D (or per standard); min WT ≥ 87.5% of nominal (negative deviation controlled); ovality ≤1.0%·D; straightness ≤0.2%·L; end squareness ≤1.6 mm; mismatch/reinforcement per standard/PO.
6.0 Qualification & Testing (PSL2/engineering level)
6.1 Mechanical/toughness: BM/WM/HAZ tensile; CVN at specified temperature; DWTT recommended for gas transmission.
6.2 Weld NDE: full-length UT; RT/DR at critical locations; CTOD/fracture where specified.
6.3 Hydrotest: every length; standardized hold/acceptance criteria.
6.4 Sour service: HIC (NACE TM0284)/SSC (TM0177) when applicable; hardness control.
6.5 Geometry: OD, min WT, ovality, end squareness, bevel/land, mismatch, internal/external bead conditioning.
6.6 Documentation: EN 10204 3.1/3.2 MTC; WPS/PQR; filler/flux batch certificates; NDE, hydrotest charts; coating QA (DFT/adhesion/holiday).
7.0 Coatings & Linings (selection & QA)
7.1 External: 3LPE (DIN 30670), 3LPP (DIN 30678), FBE (CSA Z245.20/AWWA C213), or metallic spray/thermal-spray Zn-Al for piles/offshore.
7.2 Internal: liquid epoxy (AWWA C210) for friction and corrosion control; cement-mortar lining (AWWA C205) for raw/treated water.
7.3 QA: DFT, holiday testing, adhesion, cathodic disbondment; observe cure/handling temperature windows.
8.0 Quick Mapping: Service → Material → Standard
8.1 Water transmission/return: AWWA C200 + C205 (or C210); external 3LPE/FBE; design for water hammer/seismic loads (SSAW predominantly).
8.2 Crude/product: API 5L PSL2 (X52/X60/X65 typical); 3LPE external; internal flow epoxy (LSAW preferred for high pressure).
8.3 Mid-pressure gas (onshore): Owner approval required if SSAW; limit to ≤X65/X70 with CVN/DWTT; for high-pressure/subsea/cold regions strongly prefer LSAW/Seamless depending on design.
8.4 Offshore piles/conductors: ASTM A252/JIS A5525; wall up to ~40 mm+; external metallic spray + topcoat or 3LPP.
8.5 Structural columns/casings: choose D/T, stiffeners and joint method by stability and erection method.
9.0 RFQ/PO Checklist
9.1 Standard & level (API 5L/ISO 3183 PSL1/PSL2; AWWA C200; ASTM A252; GB/T 9711; SY/T 5037).
9.2 Grade & toughness (e.g., L415/X60; impact temp for piles).
9.3 Type, Size & length (Specify LSAW-UOE, LSAW-JCOE, or SSAW; OD WT×L; D/T limits; SRL/DRL/18 m).
9.4 Process controls (SAW ID+OD; mechanical expansion; mismatch/reinforcement limits).
9.5 Inspection plan (full-length UT; RT/DR where specified; CVN/DWTT; hydrotest each; HIC/SSC for sour).
9.6 Geometric tolerances (OD/min WT/ovality/straightness/squareness; bevel & land).
9.7 Coating/lining (3LPE/3LPP/FBE/C205/C210, layer thicknesses, holiday voltage/criteria).
9.8 Docs & traceability (MTC 3.1/3.2; WPS/PQR; filler/flux; NDE/hydro; coating QA; marking/heat trace).
9.9 Special clauses (field induction bends; crack arrestors; offshore CTOD; seismic/permafrost).
10.0 Construction & Acceptance Risk Controls
10.1 Fit-up: verify end squareness/ovality; control mismatch; bevel/land consistent with welding procedure.
10.2 Coating protection: slings/saddles; ISO 21809-3 (or Owner) for field joints.
10.3 Hydro/cleaning: final dimension check; pigs per bending radius and D/T.
10.4 Galvanic & CP: isolation kits; CP design and monitoring.
10.5 Temperature windows: transport/storage/welding/coating curing limits; preheat/PHI as required.
11.0 Global SAW Industry Clusters & Representative Companies (examples; verify during pre-qual)
11.1 North America: American SAW Pipe (AMERICAN), Northwest Pipe Company, Jindal Tubular USA, Welspun Tubular LLC (USA).
11.2 Middle East: Group Five Pipe Saudi.
11.3 Europe/Türkiye: Borusan Mannesmann.
11.4 China: Manufacturing clusters in Tianjin, Cangzhou (Hebei), Shandong, Jiangsu river belt, Sichuan; Representative companies include Youfa Group, Cangzhou Steel Pipe Group.
11.5 Note: Above are illustrative for market survey and pre-qualification; verify current certifications (ISO/PED/ASME/3.2, Owners/Water authorities) and comparable references.
12.0 Delivery, Marking & Logistics
12.1 Supply: bare/coated; end caps; internal bracing if needed.
12.2 Marking: grade/PSL, dimensions, heat/lot, coating system; bundle/single barcodes.
12.3 Handling: saddles/soft slings; dunnage and soft pads for coated areas; fit for sea/rail/road.
13.0 Ready-to-Paste Spec Lines
13.1 Water trunk: AWWA C200 + C205 lining + C210 external; SSAW, ME; OD 1626 mm×WT 12.7 mm×L 12 m; 100% UT seam; hydrotest each; external 3LPE ≥2.5 mm; include MTC and DFT/holiday reports.
13.2 Product line (onshore): API 5L PSL2 L415 (X60); LSAW (UOE), ME; OD 813 mm×WT 12.7 mm×L 12 m; WM/HAZ CVN 27 J@−20 °C; 100% UT; external 3LPE; internal flow epoxy ≥300 µm.
13.3 Port pile: ASTM A252 Gr.3; SSAW; OD 1422 mm × WT 25.4 mm × L 18 m; ring/boot per IFC; external thermal-spray metal + top coat or 3LPP; full geometry checks.
14.0 Selection Notes vs. HFW/Seamless
14.1 Prefer SSAW: large-OD water/return lines, piling/structural, mid-pressure liquid lines where permitted due to cost efficiency.
14.2 Prefer LSAW: high-pressure gas, subsea trunklines, sour service (HIC/SSC), and projects with strict crack-propagation control or demanding wall thicknesses. (Select UOE for long identical runs, JCOE for variable/heavy-wall runs).
14.3 Principle: obey Owner/project spec hierarchy; align material—manufacture—inspection—coating coherently.
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