BS EN 10217-5 is a specific European standard that explicitly covers Spiral Submerged Arc Welded (SSAW/HSAW) steel pipes [citation:1, citation:2, citation:6, citation:10]. This standard is the authoritative specification for spiral welded tubes intended for pressure applications with specified elevated temperature properties [citation:1, citation:5, citation:9].
The designation "BS EN 10217-5 Spiral Submerged Arc Pipe" combines a European pressure equipment standard (EN 10217-5) with the spiral welding process (SSAW/SAWH) to produce large-diameter pipes suitable for demanding high-temperature industrial applications [citation:4, citation:6].
📋 Key Specifications for BS EN 10217-5 SSAW Pipe
The table below summarizes the primary specifications for this product, based on European standards and manufacturer data [citation:1, citation:4, citation:8].
| Attribute | Description |
|---|---|
| Standard | BS EN 10217-5:2019: "Welded steel tubes for pressure purposes - Technical delivery conditions - Part 5: Submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties" [citation:1, citation:2, citation:9]. |
| Steel Grades | P235GH: Minimum yield strength 235 MPa, most common grade for general pressure applications [citation:4, citation:8]. P265GH: Minimum yield strength 265 MPa, higher strength option [citation:4, citation:8]. Additional alloy grades for more demanding applications . |
| Material Numbers | P235GH (1.0345), P265GH (1.0425) . |
| Manufacturing Process | Spiral (Helical) Submerged Arc Welding (SAWH/HSAW) : Formed from hot-rolled steel coil, with the weld seam running continuously in a spiral along the pipe's length. Welded using double-sided automatic submerged arc welding [citation:1, citation:2, citation:6]. The standard covers both longitudinal (SAWL) and helical (SAWH) welded tubes [citation:1, citation:2, citation:10]. |
| Typical Size Range | Outside Diameter: 219 mm to 3620 mm (approx. 8" to 142") [citation:4, citation:8]. Wall Thickness: 5 mm to 25.4 mm (up to 40 mm available from some manufacturers) [citation:4, citation:8]. Length: 3 m to 18 m (customizable) [citation:4, citation:8]. |
| Common Applications | Pressure Equipment: Boilers, heat exchangers, pressure vessels, superheaters, pressure headers [citation:2, citation:6]. Fluid Transmission: High-temperature steam lines, hot water systems, process piping [citation:2, citation:6]. Industrial: Power plants, chemical processing, refineries, petrochemical plants [citation:2, citation:6]. |
| Key Testing Requirements | Chemical Analysis: Per EN 10217-5 limits [citation:4, citation:8]. Tensile Test: Including at elevated temperature [citation:2, citation:5]. Impact Test: Charpy V-notch testing [citation:2, citation:5]. Hydrostatic Test: Each pipe tested for pressure integrity [citation:2, citation:5]. Non-Destructive Testing: Ultrasonic or X-ray inspection of weld seam [citation:2, citation:5]. |
🔍 Understanding the Standard: BS EN 10217-5
Purpose and Scope: BS EN 10217-5 is a European standard that specifies technical delivery conditions for submerged arc welded tubes used in pressure applications at elevated temperatures [citation:1, citation:2, citation:10]. It specifically covers tubes of circular cross section, made from non-alloy quality steel or alloy special steel [citation:1, citation:6].
Weld Types: The standard explicitly covers both longitudinally welded (SAWL) and helically welded (SAWH) tubes, confirming its applicability to spiral submerged arc pipes [citation:1, citation:2, citation:6, citation:10].
Key Grades: The standard specifies pressure grades suitable for elevated temperature service [citation:4, citation:8]:
P235GH: Most common general-purpose pressure grade for elevated temperature service
P265GH: Higher strength option for more demanding pressure requirements
The "GH" suffix indicates the steel is suitable for elevated temperature service.
Test Categories: The standard defines two test categories with varying inspection and testing requirements [citation:1, citation:2, citation:5]. This allows purchasers to select the appropriate quality level based on application criticality.
PED Compliance: BS EN 10217-5 is harmonized with the Pressure Equipment Directive (PED) 2014/68/EU, making it suitable for CE-marked pressure equipment in Europe [citation:1, citation:2, citation:10]. The tube grades are intended to support the essential requirements of this directive [citation:1, citation:6].
Chemical Composition: The standard has strict controls on sulfur and phosphorus (max 0.020%) to ensure good weldability and elevated temperature performance [citation:4, citation:8].
📊 Chemical and Mechanical Properties
The table below shows the chemical and mechanical properties for common grades based on manufacturer data [citation:4, citation:8]:
| Grade | Chemical Composition (max %) | Mechanical Properties (min) | |||||
|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | Yield Strength (MPa) | Tensile Strength (MPa) | |
| P235GH | 0.16 | 0.35 | 1.20 | 0.025 | 0.020 | 235 | 360-500 |
| P265GH | 0.20 | 0.40 | 1.40 | 0.025 | 0.020 | 265 | 410-570 |
🔧 Manufacturing Process for BS EN 10217-5 SSAW Pipe
The manufacturing process follows standard SSAW production methods with enhanced quality controls for pressure applications [citation:4, citation:7, citation:8]:
Raw Material: Hot-rolled steel coils meeting the chemical requirements of P235GH or P265GH grades [citation:4, citation:8].
Uncoiling and Leveling: The steel coil is uncoiled and leveled to ensure flatness [citation:4, citation:8].
Edge Milling: The strip edges are precision-milled to create the correct bevel geometry for welding [citation:4, citation:8].
Spiral Forming: The strip is continuously formed into a cylindrical shape at a specific helix angle [citation:4, citation:7].
Submerged Arc Welding: Double-sided automatic submerged arc welding (inside and outside) creates the spiral seam [citation:4, citation:7].
NDT and Hydrostatic Testing: The weld seam is inspected (ultrasonic or X-ray), and each pipe undergoes hydrostatic pressure testing [citation:4, citation:5].
Finishing: Ends are prepared (plain or beveled), and any required coatings are applied [citation:4, citation:8].
⚙️ Comparison with Related Standards
| Standard | Application | Key Difference |
|---|---|---|
| BS EN 10217-5 | Pressure purposes with elevated temperature properties – submerged arc welded specifically [citation:1, citation:2] | Explicitly covers SAW process (both longitudinal and spiral) |
| BS EN 10217-2 | Pressure purposes with elevated temperature properties – electric welded [citation:4, citation:8] | Covers electric welded tubes (ERW/HFW) |
| BS EN 10217-1 | Pressure purposes at room temperature | Room temperature service only (TR grades) |
| API 5L | Oil and gas transmission [citation:4, citation:8] | International pipeline standard, different grade designation |
| BS EN 10219 | Structural hollow sections [citation:4, citation:8] | Not for pressure applications |
💡 Advantages of BS EN 10217-5 SSAW Pipe
| Advantage | Description |
|---|---|
| Elevated Temperature Performance | Specifically designed for high-temperature service up to 300-400°C+ . |
| Pressure Equipment Directive Compliance | Harmonized with PED 2014/68/EU for CE-marked pressure equipment [citation:1, citation:2, citation:10]. |
| Large Diameter Capability | SSAW process enables production of pipes up to 3620mm (142") diameter [citation:4, citation:8]. |
| Cost-Effective | More economical than seamless or LSAW pipes for large diameters [citation:1, citation:2]. |
| Two Test Categories | Allows selection of appropriate quality level based on application criticality [citation:1, citation:2, citation:5]. |
| Full Traceability | Supplied with EN 10204 Type 3.1 or 3.2 certification for complete material traceability . |
| Good Weldability | Controlled chemistry (low carbon equivalent) ensures reliable welding and fabrication . |
📝 Important Considerations
Part 5 vs. Part 2: While EN 10217-2 covers electric welded tubes (ERW/HFW) with elevated temperature properties, EN 10217-5 specifically covers submerged arc welded tubes (both longitudinal SAWL and spiral SAWH) with the same properties [citation:1, citation:4, citation:8]. Part 5 is the appropriate standard for SSAW pipes for pressure applications.
Test Categories: The standard specifies two test categories with different inspection requirements. Ensure your purchase order specifies the required test level (TC1 or TC2) .
Temperature Range: The "GH" grades are suitable for elevated temperature service, typically up to 300-400°C depending on the specific grade and wall thickness.
Quality Documentation: Pipes are typically supplied with an EN 10204 Type 3.1 inspection certificate, providing traceability and documented test results .
Manufacturer Availability: Multiple manufacturers list BS EN 10217-5 as a standard specification for their SSAW pipe products [citation:4, citation:7, citation:8].
Complete Specification: When ordering, specify: BS EN 10217-5, Grade [P235GH/P265GH], SAWH (spiral welded), Size (OD x WT), Length, Test Category [TC1/TC2], End Finish, and any supplementary requirements.
📝 Summary
BS EN 10217-5 Spiral Submerged Arc Welded pipes are the authoritative European standard for large-diameter pressure applications requiring elevated temperature performance [citation:1, citation:2, citation:6, citation:10]. This standard explicitly covers helically welded (SAWH) tubes, confirming its direct applicability to SSAW pipes. Available in grades P235GH (most common) and P265GH, these pipes combine the cost-effective SSAW manufacturing process with the stringent quality requirements of the EN 10217-5 pressure equipment standard [citation:4, citation:8].
These pipes are widely used in power plants, industrial process piping, pressure vessels, heat exchangers, and high-temperature fluid transmission applications where large diameters, pressure integrity, and elevated temperature performance are required [citation:2, citation:6]. The standard is harmonized with the Pressure Equipment Directive (PED) 2014/68/EU, making it suitable for CE-marked pressure equipment in Europe [citation:1, citation:2, citation:10].
When specifying, ensure you reference the complete standard with the required grade (P235GH or P265GH), test category (TC1 or TC2), and any supplementary testing requirements based on your specific application.
