Products Description
The EN10224 S235JR Large Diameter Spiral Welded Pipe is a high-quality carbon steel pipe manufactured using double-sided submerged arc welding (SSAW) technology. Produced in accordance with EN10224 and EN10025-2 standards, this pipe combines the structural integrity of S235JR steel with advanced dual anti-corrosion protection systems - 3LPE external coating and AWWA C210 liquid epoxy internal lining - making it an ideal solution for demanding fluid transportation and infrastructure projects.
The spiral welding process enables the production of large-diameter pipes with excellent dimensional flexibility, while the double-sided submerged arc welding ensures high weld quality and strength. The spirally distributed welds help disperse and release stress, improving the overall stress resistance of the steel pipe.
| Parameter | Specification |
| Standard | EN10224, EN10025 |
| Steel Grade | S235JR (1.0038) |
| Manufacturing Process | Spiral Submerged Arc Welding (SSAW) |
| Outer Diameter | 219 mm – 3,048 mm (8" – 120") |
| Wall Thickness | 4 mm – 30 mm |
| Length | 5.8 m – 22 m, or as per customer requirements |
| End Finish | Plain ends or beveled ends |
1.S235JR Steel Mechanical Properties
| Property | Value |
| Yield Strength | ≥ 235 MPa (nominal; typically 240–260 MPa in actual measurement) |
| Tensile Strength | 360 – 510 MPa |
| Elongation after Fracture | ≥ 26% (for thickness ≤ 16 mm) |
| Impact Energy | ≥ 27 J at 20°C |
| Hardness | ~120 – 160 HB |
| Design Operating Temperature | -20°C to +300°C |
2.Chemical Composition (S235JR, Heat Analysis)
| Element | Maximum % by Weight |
| Carbon (C) | ≤ 0.17 |
| Silicon (Si) | - |
| Manganese (Mn) | ≤ 1.40 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Nitrogen (N) | ≤ 0.012 |
| Copper (Cu) | ≤ 0.55 |
External Anti-Corrosion: 3LPE Coating
Coating Overview
The 3LPE (Three-Layer Polyethylene) external coating is a multilayer anti-corrosion system applied to the pipe's external surface for buried or underwater service--14. It consists of three functional components
| Layer | Material | Function |
| Layer 1 (Primer) | High-performance Fusion Bonded Epoxy (FBE) | Adhesion and corrosion protection |
| Layer 2 (Adhesive) | Copolymer adhesive | Bonds epoxy primer to polyethylene outer layer |
| Layer 3 (Topcoat) | Extruded MDPE/HDPE polyethylene | Mechanical protection and physical damage resistance |
Coating Standards
- DIN 30670
- CSA Z245.21
- ISO 21809-1
- AS 4321
Coating Thickness (per DIN 30670)
| Pipe Size (DN) | General (N) | Reinforcement (V) |
| DN ≤ 100 | 1.8 mm | 2.5 mm |
| 100 ≤ DN ≤ 250 | 2.0 mm | 2.7 mm |
| 250 ≤ DN ≤ 500 | 2.2 mm | 2.9 mm |
| 500 ≤ DN ≤ 800 | 2.5 mm | 3.2 mm |
| DN ≥ 800 | 3.0 mm | 3.7 mm |
Key Features
Operating temperature: -20°C to +65°C-
- Service life: 75+ years-
- Provides chemical and biological protection in all site conditions
- Cut-back ends (150 ± 20 mm from pipe ends) for field welding
Internal Anti-Corrosion: AWWA C210 Liquid Epoxy Lining
Coating Overview
The internal lining complies with AWWA C210 (American Water Works Association Standard for Liquid-Epoxy Coatings and Linings for Steel Water Pipe and Fittings). The system consists of a two-part, chemically cured epoxy coating applied in shop or field conditions.
Coating Specifications
| Parameter | Specification |
| Standard | AWWA C210 |
| Coating Thickness | 300 – 800 μm (12 – 32 mils) |
| Minimum DFT | 12 mils (approx. 305 μm |
| Maximum DFT | 18 mils (approx. 457 μm) |
| Application | Shop-applied and field-applied |
| Service | Underground or underwater steel water pipelines |
Key Features
- NSF-certified for potable water contact
- Excellent adhesion to steel substrate
- Smooth inner wall surface for low flow resistance
- Chemically resistant to water, fresh water, salt water, and other commodities
- Holiday detection tested for lining integrity
Applications
The EN10224 S235JR Large Diameter Spiral Welded Pipe with dual anti-corrosion protection is widely used across multiple industries:
1.Water Infrastructure
- Municipal water supply and distribution mains
- Drinking water transmission networks
- Raw water reservoirs and irrigation systems
- Drainage and sewage treatment pipelines
- Power plant circulating water pipes
2.Oil & Gas
- Low to medium pressure oil transportation pipelines
- Natural gas transmission and distribution
- LPG/NGL terminals and energy-distribution facilities
- Onshore and offshore flowlines
3.Structural & Civil Engineering
- Steel piling and foundation piles
- Structural columns and support pipes
- Tunnel grout conveying pipes
- Bridge and construction structural applications
4.Industrial Applications
- Chemical fertilizer and petrochemical pipelines
- Low-pressure fluid transportation in industrial settings
- Heating steam and thermal pipelines
FAQ
Q1: What is the difference between S235JR and L235 in EN10224?
S235JR is defined under EN10025-2 as a general structural steel grade, while L235 is the corresponding designation under EN10224 specifically for steel pipes used in fluid transportation. Both share similar mechanical properties with a minimum yield strength of 235 MPa
Q2: What is the maximum operating temperature for this pipe?
The S235JR steel is suitable for design operating temperatures from -20°C to +300°C. However, above 300°C, the strength decreases significantly. For the 3LPE coating, the maximum service temperature is +65°C. Please consult the coating manufacturer for specific temperature limitations.
Q3: Is this pipe suitable for potable water applications?
Yes. The AWWA C210 epoxy internal lining is NSF-certified for potable water contact- and is specifically designed for the water supply industry. The 3LPE external coating provides additional corrosion protection for buried installations.
Q4: How does spiral welded pipe compare to straight seam welded pipe?
Spiral welded pipes offer greater flexibility in adjusting diameter and wall thickness during production. The spiral weld seam distributes stress more evenly, making it suitable for large-diameter applications. However, spiral welded pipes are generally recommended for low to medium pressure applications
Q5: What quality control and testing are performed?
Standard quality control includes:
Non-destructive testing (NDT) of welds
Coating thickness measurement per SSPC-PA 2
Holiday detection for lining integrity-
Adhesion testing per ASTM D4541
Cathodic disbondment testing-24
Q6: What end finishes are available?
The pipe can be supplied with plain ends or beveled ends, as per customer requirements. Plastic end caps are available for protection during transportation and storage.
Q7: What is the typical service life of this coated pipe?
With proper installation and maintenance, 3LPE-coated steel pipes can achieve a service life of 75+ years.
Q8: Can the pipe be customized?
Yes. The pipe can be customized in terms of outer diameter (219–3,048 mm), wall thickness (4–30 mm), length (5.8–22 m), end finish, and coating specifications
Our address
Rm1406,14th/F No 208, Hongqi Road, Nankai Dist, Tianjin City ,China
Phone Number(WhatsApp/Wechat)
+8616622033809
alisa@tjshenzhoutong.com
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