Spiral Welded Pipe Standards: API 5L, ASTM A252, EN 10219 & More

When you open an inquiry for spiral welded pipes, the customer’s first statement is often “Supply according to API 5L,” followed by “PSL2” as an afterthought. If you simply reply, “No problem,” you might be setting yourself up for trouble down the line. PSL1 and PSL2 are not the same thing; the price difference can range from 5% to 15%, and the lead times and inspection workloads are completely different. This article isn’t about listing standards; it focuses solely on a few key points you must clarify before selecting standards, quoting prices, and scheduling production.

Let's start with API 5L, since most oil and gas inquiries come from there

API 5L corresponds to ISO 3183 and governs steel pipes used for pipeline transportation in the oil and gas industry. The spiral submerged-arc welded pipes manufactured by your factory are explicitly accepted under this standard. The issue lies with the two letters “PSL.”

PSL1 is the basic quality level. It specifies only a minimum yield strength with no upper limit; there are no impact toughness requirements; carbon equivalent is not mandatory; non-destructive testing is conducted according to the minimum standard requirements; repair welding on the pipe body and weld is permitted. If you receive a PSL1 order, you can schedule production as usual, and inspection costs remain manageable.

PSL2 is the enhanced version. Both yield strength and tensile strength have upper and lower limits, and the yield-to-tensile strength ratio is capped at 0.93. This ensures the pipe has sufficient strain hardening capacity when under load and will not fracture suddenly. Impact testing is mandatory for both the pipe body and the weld. An upper limit on carbon equivalent is set for each steel grade, and sulfur and phosphorus content must be even lower than for PSL1. The most critical requirement: PSL2 does not permit repair welding on the pipe body, coil, or weld seam. The “weld and repair” approach commonly practiced in your workshop is a violation under PSL2 orders. Certificates must also comply with EN 10204 3.1 or 3.2, with traceability starting from the furnace batch number.

When quoting prices, PSL2 is 5% to 15% more expensive than PSL1. This is not arbitrary markups by the factory, but rather the result of stricter chemical composition controls, more inspection items, and a higher scrap rate. If a customer asks for PSL2 at PSL1 prices, simply present the points listed above, and they will understand.

ASTM A252: Don’t Be Fooled by the Words “for Piles”

A252 refers to steel pipe piles. The full name of the standard is “Welded and Seamless Steel Pipe Piles.” The permitted weld types include spiral butt welds and spiral lap welds, so your spiral welded pipe production line is a perfect match.

A252 is divided into three grades. Grade 1 has a minimum yield strength of 30 ksi, Grade 2 is 35 ksi, and Grade 3 is 45 ksi. Please note the following when planning your production schedule: A252 sets only minimum requirements for chemical composition, unlike API 5L, which imposes strict limits on carbon equivalent, sulfur, and phosphorus. This means that A252 allows for a relatively wider range of smelting and welding parameters, but the driving stresses in pile applications are very real. There is a 10 ksi difference in yield strength between Grade 2 and Grade 3, so they cannot be interchanged arbitrarily when used in load-bearing piles.

One more detail: For A252 spiral-welded pipes, the standard itself permits “spiral-lap” welding, but your production line uses double-sided submerged arc welding, which falls under spiral-butt welding. This is permitted under A252, so you don’t need to worry about it when submitting a quote.

SY/T 5037, the primary standard for fluid conveyance in China

The 2023 edition has taken effect, replacing the 2018 edition. It governs submerged-arc welded steel pipes for general fluid conveyance, covering both straight-seam and spiral-seam pipes, and applies to water, air, and heating steam. If you’re working on domestic municipal water supply and drainage, long-distance water conveyance, or agricultural irrigation projects, this standard is cited more frequently than API 5L.

Its requirements for spiral-welded steel pipes are not as stringent as those of API 5L PSL2, but the 2023 edition explicitly includes socket-joint pipes for water conveyance projects within its scope of application. If you are working on a drinking water project, clients may also require compliance with sanitary standards; these are referenced in the main text of the standard, so be sure to review them before submitting a quote.

EN 10219: The Standard You're Most Likely to Misplace

Many salespeople automatically classify products with “EN” in the name as pipeline tubes, but this is incorrect. EN 10219 covers cold-formed welded structural hollow sections, including round, square, and rectangular tubes, intended for architectural and structural applications. It explicitly states “cold-formed, without subsequent heat treatment,” though welds may remain in the as-welded condition or be heat-treated.

If your factory delivers spiral welded pipes in accordance with EN 10219, it means customers will use them for steel structural columns, trusses, and bracing—not for transporting gas or water. Common steel grades include S275JRH and S355J2H. If you base your quotation on the inspection requirements for pipeline pipes, your cost calculation will be inaccurate. The impact test requirement in EN 10219 is “to be verified only when specified in the inquiry or order,” unlike PSL2, where it is mandatory by default. However, structural pipe customers may be more concerned with dimensional tolerances and end face flatness, which are covered by separate clauses in the standard.

AWWA C200: A Must-Have for Water Supply Projects in the Americas

If you’re working on a water supply pipeline project in the United States or the Americas, the client will likely specify AWWA C200. This standard covers spiral-welded or straight-seam welded steel pipes of 6 inches or larger, used for the conveyance and distribution of drinking water, raw water, reclaimed water, or wastewater. It does not cover oil or gas; it applies only to water.

One point to note: The minimum diameter for AWWA C200 is 6 inches (150 mm), and since your production line’s smallest diameter is 219 mm, it fully meets the requirements. However, the AWWA system’s requirements for coatings often differ from domestic standards. When submitting a quote, list 3PE or FBE as separate line items; do not include them in the pipe price.

Before you create a production schedule or provide a quote, go over this spreadsheet

What did the customer say?	Actual Corresponding Standards	Things to Keep in Mind in Your Workshop
“API 5L，PSL1”	API 5L PSL1	Repair welding is permitted; impact testing is not required; proceed with normal production scheduling.
“API 5L，PSL2”	API 5L PSL2	No repair welding allowed; impact testing required; 3.1 certificate required; extended lead time
“Steel Pipe Piles, A252 Gr. 2”	ASTM A252 Grade 2	Yield strength: 35 ksi; compliant with spiral butt weld requirements
“Domestic Water Supply Projects”	SY/T 5037-2023	Pay attention to the requirements for socket joints and drinking water quality standards.
“European Structural Tubing”	EN 10219	Not pipeline tubing; check the order to see if an impact test is specified.
“The Americas Water Pipeline”	AWWA C200	Pipe diameters start at 6 inches; coatings are quoted separately.

Save this table on your phone, and next time a customer gives you a standard number, double-check it first. Don’t schedule PSL2 orders using the PSL1 timeline; don’t apply API 5L inspection costs to A252 pile pipes; and don’t quote EN 10219 as pipeline pipe. These three mistakes can wipe out all the profit on a single order.