Cangzhou Spiral Steel Pipes Group Co.ltd
The Solid Foundation for Project SuccessPipeline for Oil And Gas
Oil & Gas Pipeline Solutions | 18m API 5L Spiral Welded Pipe (SAWH)
Delivered by Cangzhou Spiral Steel Pipe Group – China's Largest Spiral Pipe Mill
OD: 219-3620mm
Wall Thickness: 5-24.5mm
Length: 1-18m or Custom
Coating: FPE 3PE
Certification: CE/ APL 5L/ISO9001/ISO14001/ISO45001/CNAS,etc.
Steel Grade: PSL2 X42 /X46/X52/X56/X60/X65/X70,etc.
Brand: WuZhou
OEM: Accept
Standard: API Spec 5L/ISO 3183/GB/T 9711/CSA Z245.1,etc.
Delivery Time: 3-45 Days
Payment: TT/LC
Making Process: SSAW/SAWH
Producing Area: Cangzhou China
Main Application: Oil Gas Pipe Line
MOQ: 2-5 Tons
Why Engineers Choose Our 18m & 3620mm Spiral Steel Pipe
18 meters – single random length, reducing field girth welds by 33% vs 12m pipe.
3,620 mm OD – one of the few mills in Asia capable of 142-inch large diameters.
API 5L PSL2 (X42-X80) with CNAS-accredited in-house test reports – accepted globally.
How Much Can 18m Pipe Save On Your Next Pipeline?
Concrete example: a 100km onshore gas pipeline project
| Standard 12m pipe | Your 18m pipe |
| Number of girth welds: ~8,333 welds | Number of girth welds: ~5,555 welds |
| Estimated field NDT workload: Baseline (100%) | Estimated field NDT workload: Reduced by 33% |
| Estimated truck trips (per km): Baseline (100%) | Estimated truck trips (per km): Reduced by 30% |
Why Our Factory Stands Out
| Customer Concern | Our Solution |
| High on-site welding cost | 18m pipe cuts field joints by 1/3, proven 15-20% lower installation cost |
| Risk of weld failure | 100% AUT + X-ray + hydro test; CNAS witnessed mechanical tests |
| Difficulty finding large OD for offshore/CCUS | Ø3620mm capacity – one of few mills in Asia capable of 142-inch spiral pipe |
International project compliance | API 5L Monogram + CNAS (ILAC-MRA mutual recognition) – accepted by Aramco, Shell, TOTAL |
✅ Direct result: 2,778 fewer field joints. Lower labor, consumable, and inspection costs. Faster project completion.
Technical Specifications
Core Product Standard (Steel Pipe Manufacturing and Delivery)
As the core standard to be followed by the spiral welded pipe factory, it directly determines the performance index of the steel pipe itself.
| Standard No | Name of standard | Scope and characteristics of application |
| API Spec 5L | Line pipe specification | The most widely used general basic standard in the world, formulated by American Petroleum Institute, covers steel pipe manufacturing, chemical composition, mechanical property, etc. Often used as the basis of project technical specifications. |
| ISO 3183 | Petroleum and natural gas industries - Steel pipes | International standard, technically similar to API 5L, but supplemented in some detail requirements, mostly used for international projects. |
| GB/T 9711 | Petroleum and natural gas industries - Steel pipes for pipeline transport systems | Chinese national standard, equivalent to or modified by ISO 3183, is mandatory or basic standard for domestic oil and gas projects. |
CSA Z245.1 | Steel pipeline | Canadian standards have their own characteristics in some technical indicators and are commonly used for North American or specific international projects. |
Pipeline system design and construction standards (how to lay the pipeline)
This standard specifies how to design, install and operate the pipeline as a whole system, and puts forward requirements for the final service conditions of the steel pipe.
| Standard No | Name of standard | Scope and characteristics of application |
| ASME B31.4 | Piping Systems for Liquid Hydrocarbons and Other Liquids | Design Specification for Onshore Liquid Pipelines (e.g. Crude Oil, Product Oil). |
| ASME B31.8 | Gas piping system | Code for Design of Onshore Gas Pipelines |
| DNV-ST-F101 | Subsea pipeline system | The authoritative standard for subsea pipelines covering the full life cycle of design, materials, installation and operation. More stringent requirements than for onshore pipelines |
ISO 13623 | Petroleum and natural gas industries - Pipeline transport systems | International pipeline system design standards covering land and seabed. |
CSA Z662 | Oil and gas pipeline system | Canada's famous pipeline system standard, complete system, including design, construction, operation, etc |
Corrosion Control And Special Service Environment Standard (For Acid Medium, Etc.)
For the anti-HIC/SSC performance that you have previously focused on, the following are specific standards that must be followed.
| Standard No | Name of standard | Key Contents |
| NACE MR0175/ISO 15156 | Materials for HS Environments in Oil and Gas Production | The mandatory qualification criteria for materials for sour service (Sour Service) specify the threshold for resistance to sulfide stress corrosion (SSC) |
| NACE TM0284 | Evaluation of HIC Resistance of Pipeline Steel and Pressure Vessel Steel | Standard Test Method for Hydrogen Induced Cracking (HIC) |
| NACE TM0177 | Resistance of metals to SSC in the environment of HS | Standard Test Method for Sulfide Stress Corrosion (SSC) |
ISO 21809 series | External anticorrosive coating of pipeline | Technical requirements for external anticorrosive coatings such as 3LPE, 3LPP and FBE are specified. |
Other Key Supporting And Inspection Standards
Supporting standards to ensure the integrity of the entire piping system.
Welding standards: API 1104 (welding of pipelines and related facilities) and ISO 13847 (pipeline transportation system - pipeline welding).
Pipe fitting standard: MSS SP-75 (high-strength butt welding pipe fittings), ASME B16.5 (flange).
Valve standard: API 6D (Pipeline Valve).
Non-destructive testing: Personnel Qualification (ISO 9712) and Method Standard (ISO 17635).
Application Recommendations
In actual projects, these standards are used in combination. For example, for a typical international subsea pipeline project, its technical specification may be quoted as follows:
Steel pipes shall comply with API 5L PSL2, but supplementary requirements shall be implemented according to DNV-ST-F101. The pipeline design shall comply with DNV-ST-F101, the welding procedure qualification shall comply with API 1104, the external anticorrosive coating shall be 3LPE, which shall meet ISO 21809-1. Since the transmission medium contains HS, the material must comply with NACE MR0175/ISO 15156. ”
For your plant, API 5L is the admission ticket to open the market, while for a specific project, understanding and meeting the additional requirements of standards such as DNV-ST-F101 (marine engineering) and NACE MR0175 (acid service) is the key to reflect the technical strength.
If you have any questions about standards and technology, please do not hesitate to contact our technical factory manager
Key Technical Highlights
Length advantage: Length advantage: 18m length with +30mm/-0mm tolerance (conforms to API 5L for pipes <30m) – saves trucking trips, reduces field NDT workload.
Dimensional control: Ovality ≤ 0.5% (API allows 1.0%), OD tolerance ≤ ±3mm for large diameters.
Toughness: Charpy V-notch (0℃) – Weld metal ≥150J, HAZ ≥150J, Base metal ≥200J.
Hydrostatic pressure: Up to 25MPa (3625 psi) for medium diameters; documented with digital recorder.
Certifications (Trust & Compliance)
✔ API Spec 5L (License #5L-0640)
✔ CNAS (China National Accreditation Service) – Lab No. CNAS L19514
✔ China Special Equipment License – Grade A1 for pressure piping elements
*Your project can accept our CNAS test report directly as final inspection document – no third-party lab needed, saving 7–10 days.*
Project Case Studies | 18m & Large OD Spiral Pipe in Action
Central Asia Gas Pipeline (Line D): Supplied 230km of Ø1219 x 18.4mm, 18m length SAWH pipe – reduced field welds by 8,500 joints.
Domestic CCUS (Carbon Capture) project: Used Ø3620mm large-diameter pipe for supercritical CO₂ transport – single pipe weight 18 tons.
Central Asia Gas Pipeline (Line D) – 18m Pipe in Use
Challenge: Reduce on-site welding in remote desert terrain.
Our Solution: Supplied 230km of Ø1219 x 18.4mm, 18m length API 5L PSL2 pipe.
Result: Reduced total field girth welds by 8,500 joints (compared to 12m pipe). Lower project logistics and NDT costs.
Domestic CCUS Project – World's Largest Diameter
Challenge: Transport supercritical CO₂ at high flow rates.
Our Solution: Fabricated Ø3620mm large-diameter spiral pipe (single pipe weight 18 tons).
Result: Enabled unprecedented flow capacity with fewer field joints.
Instant Response Form
*Tell us your OD, WT, grade, and total length → We will provide a cost-saving comparison (12m vs 18m) within 4 hours.*
📧 richard@ssawpipe.com | 📞 Tel:+86 15822968134
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Carbon steel SSAW pipe API 5L
We offer high-quality steel pipes: DIN EN 10220 spiral welded, API 5L spiral, heavy-duty drill, ARC welded pile, cold-rolled carbon, & spiral round. Made with advanced processes, they boast high strength, corrosion resistance, and good welding. Ideal for oil/gas, construction, bridges, machinery. Customized services available to meet industry demands.
Carbon steel line pipe as per API 5L SSAW/SAWH pipes large outside diameter
FAQ
Why Cangzhou Spiral Steel Pipe Group is China's Largest Mill?
Is 18m pipe difficult to transport?
No. We have dedicated logistics plans using extendable flatbed trailers. For large diameters (e.g., 3620mm), we arrange custom barge or escorted trucking solutions. Per-meter freight cost is often lower than 12m pipe due to 30% fewer truck trips.
Can you provide HIC-tested pipe for sour service?
Yes. We supply API 5L PSL2 pipe with additional HIC (NACE TM0284) and SSC (NACE TM0177) testing, fully certified by our CNAS Lab #L19514. Required for sour gas applications with high H₂S content.