Quick Answer — Which EN 10204 Certificate Do You Need?
EN 10204 2.2 is a test report where the manufacturer declares that the material complies with the order, but it is not issued by an inspection authority. Type 3.1 is an inspection certificate issued by the manufacturer's authorized inspection representative who is independent of the production department and has verified the test results. Type 3.2 is an inspection certificate signed by both the manufacturer's authorized inspector and the buyer's inspector or an independent third party who has witnessed the testing. For general European process-plant projects, 3.1 is the default. For safety-critical applications, PED Category III/IV equipment, or when the end user requires external verification, 3.2 is required. The 3.2 certificate typically costs 15-25% more than 3.1 because of the additional witness and coordination. We at HT PIPE issue 3.1 certificates on roughly 78% of our European shipments and 3.2 certificates for the remaining 22%, often with TUV, Bureau Veritas, or Lloyd's Register as the third-party witness.
Certificate Types at a Glance: EN 10204 2.2 vs 3.1 vs 3.2
| Feature |
EN 10204 2.2 |
EN 10204 3.1 |
EN 10204 3.2 |
| Official Name |
Test Report |
Inspection Certificate 3.1 |
Inspection Certificate 3.2 |
| Issued By |
Manufacturer's quality department |
Manufacturer's authorized inspector, independent of production |
Manufacturer's authorized inspector + buyer's or independent third-party inspector |
| Inspection Authority |
No independent inspection authority |
Internal inspection authority only |
External inspection authority (buyer or third party) |
| Test Results Source |
Based on manufacturer's own testing or batch testing |
Specific test results from the delivered product |
Specific test results witnessed on the delivered product |
| Traceability |
Limited; usually batch-level |
Full material traceability; heat number on certificate |
Full traceability; witness signature confirms identity |
| Typical Cost Uplift |
Base price |
Base price to +5% |
+15% to +25% over 3.1 |
| Common Use Case |
General commercial products, non-critical components |
Standard European process equipment, PED Category I/II |
PED Category III/IV, safety-critical, offshore, nuclear, high-pressure |
| HT PIPE Usage |
Rare; used only for non-pressurized commercial parts |
~78% of European orders |
~22% of European orders, often with TUV/BV/Lloyd's witness |
What Is EN 10204 and Why Does It Matter?
EN 10204 is a European standard titled "Metallic products — Types of inspection documents." It defines the content and issuer of the documents that accompany metallic products such as steel plates, pipes, fittings, flanges, and forgings. If you sell into Europe, you will eventually receive a request for an EN 10204 certificate. It is not a product quality standard by itself; it is a documentation standard that tells the buyer how much confidence they can have in the test data they are receiving.
The certificate type determines who inspected the material, who signed the document, and whether the tests were witnessed by an external party. This matters for traceability, for insurance, for project audits, and for regulatory compliance. A wrong certificate type can delay customs clearance, cause rejection at receiving inspection, or invalidate a PED certification package.
We at HT PIPE have been issuing EN 10204 documents for more than 15 years. Almost every European RFQ we receive — whether from Germany, Netherlands, Italy, or France — includes a line somewhere that says "certificate to EN 10204 3.1" or "3.2 by TUV." It is worth taking the time to understand the difference because it directly affects pricing and lead time.
What Is an EN 10204 2.2 Certificate?
Type 2.2 is the lowest level of inspection document in the EN 10204 family. It is a "test report" in which the manufacturer states that the supplied products comply with the order requirements based on test results from non-specific inspections. In other words, the test data may come from the same production batch, but the certificate does not need to be issued by a person who is independent from the manufacturing process.
Because there is no independent inspection authority involved, 2.2 is generally not accepted for pressure equipment, structural steel, or safety-critical applications. It is more common for commercial-grade hardware, non-pressurized fittings, or components where the buyer only needs a statement of chemical composition without regulatory verification. We rarely issue 2.2 for our main products because our pipe fittings and flanges are almost always used in pressurized systems.
One thing buyers often misunderstand: a 2.2 certificate can still contain real test data. It is not automatically fake or unreliable. The difference is that the inspection function was not independent. For non-critical applications, 2.2 may be perfectly adequate. But if the end user or notified body asks for 3.1, a 2.2 certificate cannot be upgraded after shipment; you would need to re-inspect or replace the material.
What Is an EN 10204 3.1 Certificate?
Type 3.1 is an "inspection certificate." It is issued by the manufacturer's authorized inspection representative, who must be independent of the manufacturing department. This means the inspector cannot report to the production manager and cannot be someone whose job performance depends on production output. Independence is the key requirement.
The 3.1 certificate contains the actual test results from the specific heat or product being supplied. It includes the heat number, chemical composition, mechanical properties (yield strength, tensile strength, elongation, hardness), and any supplementary tests such as Charpy impact, corrosion, or NDE. The certificate is signed by the authorized inspector, and the manufacturer's name and certification are clearly stated.
For most European process-plant projects, 3.1 is the default certificate type. It satisfies PED 2014/68/EU for Category I and II equipment, and it is accepted by most EPCs and end users for standard piping packages. It does not require a buyer or third-party inspector to be present during testing, which is why it is faster and cheaper than 3.2.
In our quality system, the authorized inspector is a separate role with direct reporting to the quality manager. He or she reviews the production records, confirms the test results, checks the heat-number traceability, and then signs the 3.1 certificate. This separation of duties is audited by our ISO 9001 registrar and by our PED notified body.
What Is an EN 10204 3.2 Certificate?
Type 3.2 is the highest level of inspection certificate under EN 10204. It is issued when the buyer's inspector or an independent third-party inspector verifies the test results and confirms that the product meets the order requirements. The third party can be a classification society (Lloyd's Register, DNV, Bureau Veritas), a notified body (TUV, SGS, TUV Rheinland), or the buyer's own inspector.
The critical difference from 3.1 is witnessing. For a 3.2 certificate, the external inspector must verify that the tests have been performed on the correct material, review the traceability, and sign off. The certificate is then issued by both the manufacturer's authorized inspector and the external inspector. This dual signature gives the end user and the regulatory authority the highest level of confidence.
Type 3.2 is typically required for PED Category III and IV equipment, offshore platforms, nuclear projects, high-pressure pipelines, and any project where the end user wants independent verification of material quality. It is also common when the buyer's project finance or insurance company requires an extra layer of assurance.
At HT PIPE, we have standing agreements with TUV, Bureau Veritas, and Lloyd's Register for witnessed inspection. We book the third-party inspector early in the schedule because missed witness dates can delay the whole shipment by 2-4 weeks.
How Do Costs Compare?
Cost is one of the most practical differences. A 3.1 certificate adds little cost beyond the standard inspection work because the manufacturer is already running a quality system. A 3.2 certificate adds cost in three areas: (1) the third-party inspector's fee, (2) the coordination time required to schedule tests around the inspector's availability, and (3) the potential for re-testing if the inspector identifies issues.
In our experience, the cost uplift for a 3.2 certificate compared to a 3.1 certificate is typically 15-25% for small to medium orders. For large orders with many items, the percentage may be lower because the inspector can witness multiple heats and tests in one visit. For single-piece or small-batch orders, the percentage can be higher because the fixed inspector cost is spread over fewer pieces.
We recommend that buyers specify 3.2 only when it is genuinely required. If the project spec calls for 3.1 but the procurement manager adds "and 3.2" just to be safe, the project pays extra money without gaining technical benefit. We always ask buyers to confirm the certificate type in writing before quoting so there is no ambiguity.
How Do 3.1 and 3.2 Relate to PED and CE?
PED 2014/68/EU is the European Pressure Equipment Directive. It classifies pressure equipment into categories I, II, III, and IV based on fluid hazard, pressure, and volume. For Category I and II equipment, the manufacturer can self-certify the design and production under a quality system, and EN 10204 3.1 certificates are generally sufficient for material traceability.
For Category III and IV equipment, a notified body must be involved in the conformity assessment. The notified body may require 3.1 certificates for standard materials, but it often requires 3.2 certificates for safety-critical components or when the material is sourced from outside the EU and the notified body wants independent verification. The specific requirement depends on the module chosen (Module H, Module B+D, Module G, etc.) and the material acceptance standard.
CE marking is the visible declaration that the equipment meets PED requirements. The material certificates are part of the technical file that supports the CE marking. You cannot CE mark a pressure vessel without valid material certificates. Therefore, specifying the correct EN 10204 type is a regulatory issue, not just a paperwork issue.
Real-World Selection Guide — HT PIPE European RFQ Data
Based on our actual European order history, here is how certificate selection breaks down in practice:
- EN 10204 3.1 for general process piping: ~78% of our European orders. Typical RFQ: flanges and BW fittings for chemical plants, refineries, power stations, and water treatment plants. Standard grades: A105, A350 LF2, A182 F304, A234 WPB, A860 WPHY 52. Lead time impact: usually 1-2 days for certificate preparation.
- EN 10204 3.2 for safety-critical projects: ~22% of our European orders. Typical RFQ: high-pressure flanges, pipeline fittings, offshore manifolds, and nuclear-grade components. Common witnesses: TUV, Bureau Veritas, Lloyd's Register, DNV. Lead time impact: 2-4 weeks depending on inspector availability.
- 2.2 for non-pressurized or commercial parts: Less than 1% of our main product orders. Occasionally used for loose hardware, blanks, or prototype samples where the buyer explicitly requests the lowest documentation level.
When in doubt, we ask three questions: (1) What PED category is the equipment? (2) Does the end user's specification name a certificate type? (3) Is the buyer's inspector or a third-party witness required? The answers usually point clearly to 2.2, 3.1, or 3.2.
Project Case Studies — HT PIPE Experience
These examples show how certificate selection plays out in real projects:
- 2024, Netherlands chemical plant: The project supplied 1,400 EN 1092-1 PN40 flanges in 316L for a Category III pressure system. The EPC specified EN 10204 3.1 certificates because the notified body (Lloyd's Register) accepted 3.1 for standard EN material. We prepared the full certificate package including heat numbers, chemical analysis, mechanical tests, and NDE reports. The notified body review passed in 10 days, and the CE marking was applied without issue.
- 2024, German offshore wind platform: A jacket leg structure needed transition pieces and high-pressure piping in A860 WPHY 65. The buyer required 3.2 certificates witnessed by TUV at our mill. We scheduled the TUV inspector for the Charpy test, tensile test, and ultrasonic testing days. The project ran smoothly because we booked the inspector 6 weeks in advance. Total order value: approximately $180,000, with certificate-related cost uplift of about 18%.
- 2025, Italian power plant: The original RFQ asked for 3.2 certificates for every single flange, including small Class 150 A105 slip-on flanges in a non-safety-related piping system. We reviewed the piping class and confirmed the PED category was II. We proposed 3.1 instead, explained the reasoning, and the buyer accepted. The order saved the client approximately €12,000 in third-party inspection fees without any technical compromise.
Frequently Asked Questions
Q1: What is the difference between EN 10204 3.1 and 3.2?
Type 3.1 is issued by the manufacturer's authorized inspector who is independent of production. Type 3.2 is issued by both the manufacturer's authorized inspector and the buyer's inspector or an independent third party who has verified the test results. The 3.2 certificate provides external verification; 3.1 relies on the manufacturer's internal quality system.
Q2: Is a 2.2 certificate acceptable for PED equipment?
Generally no. PED requires material traceability and verification by an inspection authority. For most pressure equipment, the minimum accepted level is 3.1, and for Category III/IV or safety-critical equipment, 3.2 is often required. A 2.2 certificate lacks the independent inspection element and is normally rejected by notified bodies for pressure parts.
Q3: How much more does a 3.2 certificate cost than a 3.1 certificate?
In our experience, 3.2 typically costs 15-25% more than 3.1. The exact amount depends on the third-party inspector's fee, the number of tests to be witnessed, the number of heats involved, and the location of the inspection. Large orders can push the percentage lower; single-piece orders can push it higher.
Q4: Can a 3.1 certificate be converted to 3.2 after the product is shipped?
No, not in the standard sense. A 3.2 certificate requires the external inspector to witness the testing or verify the material identity at the manufacturing stage. Once the product has left the factory and tests are no longer available for witnessing, you cannot retroactively create a valid 3.2 certificate. The only option is to re-inspect the material if it is still accessible, which may require destructive sampling.
Q5: Does a 3.2 certificate guarantee better material quality than 3.1?
Not necessarily. Both certificates can be based on the same physical test results. The difference is the level of independent verification. A 3.2 certificate means someone outside the manufacturer has confirmed the tests, but it does not change the material itself. Good quality control under 3.1 can produce material that is just as good as under 3.2.
Q6: Who can issue a 3.2 certificate?
A 3.2 certificate is issued jointly by the manufacturer's authorized inspector and the buyer's inspector or an independent third party. Acceptable third parties include classification societies (Lloyd's Register, DNV, Bureau Veritas), inspection bodies (SGS, TUV, Intertek), and sometimes the buyer's own inspector if the buyer has a recognized inspection department. The key is that the external party is independent of the manufacturer.
Related Comparisons & Resources
