How does EN10208 steel pipe differ from EN 10208-1 and EN 10208-2 standards?

Specifying line pipe for a combustible-fluid pipeline is rarely a single-decision task. Buyers usually need to choose between several European standards, and EN 10208 is one of the most commonly referenced — yet it is also one of the most easily confused. Many procurement documents simply write "EN 10208 steel pipe" without specifying a part number, which can lead to mismatched deliveries, delayed inspections, and project approval problems. This guide explains how EN 10208 steel pipe differs across the standard's parts, what each requirement class really demands, and how to align the order with your project scope.

What EN 10208 actually covers

EN 10208 is a European standard that defines the technical delivery conditions for seamless and welded steel pipes used in the on-land transport of combustible fluids — primarily in gas supply systems. It explicitly excludes pipeline applications in the petroleum and natural gas exploration and production industries, which fall under ISO 3183 instead. The standard was first issued in 1997 and revised in 2009, before being largely superseded by EN ISO 3183:2012 for new projects.

The standard is split into two main parts that buyers, engineers, and inspectors must understand clearly before placing an order.

EN 10208-1 vs EN 10208-2: requirement class A vs B

The most important distinction inside EN 10208 is the requirement class:

• EN 10208-1 (Requirement Class A): Less stringent quality and testing requirements. Suitable for general on-land gas supply applications where the operating conditions are moderate and the consequence of failure is lower.
• EN 10208-2 (Requirement Class B): More stringent quality and testing requirements than Class A. Used when the pipeline must demonstrate higher integrity in testing, traceability, and non-destructive examination.

In short, both parts cover the same product family — seamless and welded steel pipe for combustible fluids — but Class B adds a tighter set of acceptance criteria on top of Class A. The strength levels (grade designations such as L245, L290, L360, L415, L485 and the corresponding "L" suffix steels) are the same across both parts; the difference lies in how strictly the pipe must be made, tested, and documented.

Where EN 10208 fits in the wider standards landscape

EN 10208 does not stand alone. Its relationship with other commonly used line-pipe standards is the second most common source of confusion for buyers:

When EN 10208 was withdrawn in favor of EN ISO 3183:2012, the technical content of the Class B part was largely aligned with API Spec 5L, which is why EN 10208-2 specifications and API 5L PSL2 specifications are often referenced side by side on the same project.

Key technical differences between Part 1 and Part 2

Although both parts share the same product range and grade families, EN 10208-2 raises the bar in several measurable ways. The table below summarizes the practical differences that affect procurement, inspection, and documentation.

Practical tip: if your procurement team writes "EN 10208" without a part number on the purchase order, the mill will often default to EN 10208-1 (Class A). When in doubt, specify EN 10208-2 (Class B) explicitly, and confirm the inspection document type in the order — this is the single most common cause of disputes at goods-in inspection.

Common grades and how they are ordered

Both parts of EN 10208 use the same grade family based on the minimum specified yield strength. The grade designation is the letter "L" followed by the yield strength in MPa. The most common grades for on-land gas pipeline projects are:

• L245 (Grade B): Lower strength, used for low-pressure distribution mains.
• L290 (Grade X42): Common for medium-pressure gas transmission.
• L360 (Grade X52): Widely used for high-pressure transmission lines.
• L415 (Grade X60): Used where higher strength allows thinner walls and reduced tonnage.
• L485 (Grade X70): Used for long-distance, high-pressure transmission, often with sour-service considerations.

A typical ordering line therefore reads: "EN 10208-2, L360NB, seamless, 323.9 × 12.7 mm, with 3.2 inspection certificate to EN 10204." The suffix "NB" indicates normalizing rolled condition, while other suffixes cover quenched and tempered, thermomechanical rolled, or as-rolled deliveries.

Manufacturing route and inspection requirements

Under both EN 10208-1 and EN 10208-2, the pipe may be supplied as either seamless (S) or welded (W). The standard covers:

• Steelmaking and pipe manufacturing routes, including strip end welds and jointers.
• Heat treatment condition (as-rolled, normalized, normalized rolled, quenched and tempered, thermomechanical rolled).
• Sizing, dimensional tolerances, and mass.
• Chemical composition, mechanical properties (tensile, impact, hardness), and weldability.
• Non-destructive testing of the pipe body and welds.
• Marking, coating for temporary protection, and inspection documents.

The difference is the depth and severity of these requirements. Class B pipes must pass stricter visual, dimensional, and NDT acceptance; their weld seams are examined more rigorously; and the documentation package typically includes a higher-grade certificate per EN 10204 (for example 3.2 instead of 3.1).

Where EN 10208 steel pipe is used today

Even though EN 10208 has been formally withdrawn and replaced by EN ISO 3183, the designation is still widely used in:

• Municipal and regional gas distribution networks in Europe, the Middle East, and Asia.
• Long-distance on-land gas transmission projects that pre-date the migration to EN ISO 3183.
• Brownfield replacement and extension projects that must match the original EN 10208 specification.
• Industrial pipelines within refineries, petrochemical complexes, and power plants where the combustible-fluid scope applies.

For new oil and gas transmission projects, ISO 3183 steel pipe or API 5L steel pipe is now the correct reference. EN 10208 remains the right choice when the project documentation specifically calls it out, or when the pipeline falls outside the petroleum and natural gas exploration and production scope.

How to specify EN 10208 correctly on a purchase order

To avoid mismatches, the purchase order should always include the following minimum information:

1. Standard and part number: EN 10208-1 or EN 10208-2.
2. Steel grade: e.g. L360.
3. Delivery condition: e.g. NB (normalized rolled) or QB (quenched and tempered).
4. Manufacturing route: S (seamless) or W (welded, with further sub-classification if needed).
5. Outside diameter × wall thickness, length, and end finish.
6. Inspection document type per EN 10204 (typically 3.1 or 3.2).
7. Any optional requirements agreed at the enquiry stage (specific NDT, supplementary testing, marking, coating).

A complete order line removes ambiguity at goods-in inspection, shortens the approval loop, and reduces the risk of rejected deliveries on site.

Sourcing EN 10208 steel pipe from EZ Steel Industrial

As a manufacturer and integrated supplier of industrial metal piping systems, EZ Steel Industrial supplies EN 10208 seamless and welded steel pipes for combustible-fluid transport, along with the full matching package of pipe fittings, pipe flanges, gaskets, stud bolts, and industrial valves required for project delivery. Manufacturing is supported by three production sites covering alloy, carbon, stainless, and copper-nickel materials, with API 5L and API 5CT product certification, ISO 9001 quality management, and more than 12 in-line quality checkpoints. Mill test certificates, hydrostatic testing, ultrasonic testing, and positive material identification are available on request.

If you are evaluating EN 10208-1 versus EN 10208-2 for a specific gas pipeline, share the operating pressure, fluid composition, design temperature, and project specification with the engineering team. They will return a complete grade-and-class recommendation, the relevant inspection document, and a quotation covering pipe plus matching fittings and flanges.

Frequently asked questions

Is EN 10208-1 still valid?
Yes, technically — the 2009 edition has not been formally replaced on a one-to-one basis. However, for new oil and gas industry projects, EN ISO 3183:2012 is the preferred reference. EN 10208-1 remains the right choice for general on-land gas supply applications outside the petroleum and natural gas exploration and production scope.

Can EN 10208-2 pipe be used in place of API 5L PSL2?
On many projects, yes — the technical content of EN 10208-2 is closely aligned with API 5L PSL2. However, the project specification should always dictate which standard and which edition are called up. When both are referenced, the manufacturer must satisfy the stricter of the two.

What is the difference between EN 10208 and EN 10216?
EN 10208 is for line pipe transporting combustible fluids (pipelines). EN 10216 is for seamless pressure-purpose steel tubes used in pressure vessels, boilers, and process piping. They are not interchangeable.

Which inspection document should I request — 3.1 or 3.2?
For EN 10208-1 (Class A), 3.1 is usually sufficient. For EN 10208-2 (Class B), 3.2 is commonly requested because it provides independent third-party validation of the test results.

Does EZ Steel Industrial supply both EN 10208-1 and EN 10208-2?
Yes. Both requirement classes can be supplied, together with matching fittings, flanges, gaskets, stud bolts, and valves, with mill test certificates issued to EN 10204.