What is EN 10217?
EN 10217 is a European Standard titled "Welded steel tubes for pressure purposes - Technical delivery conditions." It specifies the requirements for welded steel tubes, primarily made from carbon and carbon-manganese steels, that are intended for use in pressure equipment, such as boilers, heat exchangers, and piping systems.
This standard is part of the European Pressure Equipment Directive (PED) 2014/68/EU framework, meaning pipes manufactured to this standard are presumed to conform to the essential safety requirements of the PED.
Key Components of the Standard
The EN 10217 standard is divided into several parts, each covering different steel grades, manufacturing processes, and specific applications.
| Part | Title | Key Characteristics & Common Steel Grades |
|---|---|---|
| EN 10217-1 | Non-alloy steel tubes with specified room temperature properties | Process: Mainly electric welding. Grades: P195TR1, P195TR2, P235TR1, P235TR2. Use: General pressure purposes at ambient temperature. |
| EN 10217-2 | Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties | Process: Electric welding. Grades: P195GH, P235GH, P265GH. Use: For higher temperature service (e.g., boiler tubes, superheaters). |
| EN 10217-3 | Alloy fine grain steel tubes | Process: Usually welded + heat treated. Grades: P460NH, P275NL1, P275NL2, P355NL1, P355NL2. Use: Low-temperature applications (the "L" in NL stands for "low temperature"). Good toughness. |
| EN 10217-4 | Arc welded non-alloy and alloy steel tubes with specified low temperature properties | Process: Submerged arc welding (SAW). Grades: P215NL, P255NL, P355NL1, P355NL2. Use: For large diameter pipes requiring high integrity, often for low-temperature service. |
| EN 10217-5 | Submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties | Process: Submerged arc welding (SAW). Grades: P235GH, P265GH, P355GH. Use: Large diameter pipes for high-temperature pressure service. |
Common Steel Grades and Their Meanings
The grade designation provides information about the steel's properties:
Pxxx: The "P" stands for "Pressure." The number (e.g., 235) indicates the minimum specified yield strength (ReH) in MPa at room temperature.
GH: Stands for "Gases" and "High" temperature. These grades are suitable for elevated temperature service.
NL: Stands for "Normalized" and "Low" temperature. These are fine-grain steels, normalized (heat-treated) for improved toughness at low temperatures. The number (NL1 or NL2) indicates different impact energy requirements.
TR1 / TR2: "TR" stands for "Tube" and "Room" temperature. These are non-alloy steels for use at ambient temperature, with TR2 having slightly higher carbon content than TR1.
Examples:
P235GH: A pressure steel with min. 235 MPa yield strength, for elevated temperature service.
P355NL1: A pressure steel with min. 355 MPa yield strength, normalized for low-temperature service, meeting impact energy level 1.
Manufacturing Process
Pipes to EN 10217 are welded, not seamless. The main processes include:
Electric Welding (EW): A strip is formed into a tube and the seam is welded using an electric resistance method. Common for smaller diameters.
Submerged Arc Welding (SAW): The pipe is formed from a plate or coil, and the weld is made using an arc under a blanket of flux. This is common for large-diameter, heavy-wall pipes.
Typical Applications
Due to their pressure-rated nature, EN 10217 pipes are used in critical applications:
Power Generation: Boiler tubes, superheaters, and feedwater lines in fossil fuel and biomass power plants.
Process Industries: Piping systems in chemical plants, petrochemical refineries, and oil & gas facilities.
Heat Exchangers: Shell and tube bundles.
Construction: For structural purposes in applications where pressure containment is also a factor.
Comparison with Other Standards
It's common to compare EN 10217 with other major international standards.
| Feature | EN 10217 (European) | ASTM A53 / A106 (American) | API 5L (International - Line Pipe) |
|---|---|---|---|
| Primary Focus | Pressure equipment (PED) | General & high-temp pressure service | Transportation of oil, gas, and other fluids |
| Process | Welded (EW, SAW) | Seamless (A106) & Welded (A53) | Seamless & Welded (ERW, SAW, DSAW) |
| Key Grades | P235GH, P265GH, P355NL1 | A53 Gr.B, A106 Gr.B | API 5L Gr.B, X42 to X80 |
| Governing Body | CEN (European Committee for Standardization) | ASTM International | American Petroleum Institute |
Note: While there is overlap, direct equivalence is not always perfect. A project specification will dictate the required standard.
Key Points for Buyers and Engineers
Material Certification: Always request a 3.1 Material Certificate from the manufacturer. This is a mandatory, type-inspected certificate for materials for pressure equipment under the PED.
Testing: Pipes are subject to rigorous testing, including hydrostatic testing, non-destructive testing (NDT) of the weld seam, tensile tests, impact tests (for NL/GH grades), and chemical analysis.
Dimensions: While EN 10217 specifies the material and technical delivery conditions, the dimensional standards are typically covered by EN 10216 (for seamless) or more commonly EN 10219 (for cold-formed welded) or EN 10224 (for water and other fluids). However, dimensions are often agreed upon between the purchaser and manufacturer.
In summary, EN 10217 Carbon Steel Pipe represents a high-quality, welded steel tube specifically designed and certified for safe use in pressurized systems across Europe and other international markets adhering to European standards.
