CE Marking vs ASME Certification

CE Marking and ASME Certification represent two fundamentally different approaches to pressure equipment compliance. CE Marking is a European legal declaration that a product meets EU health, safety, and environmental directives. ASME Certification is a North American voluntary program confirming that equipment is designed and manufactured per ASME Boiler and Pressure Vessel Code rules.

Side-by-Side Comparison

Aspect	CE Marking	ASME Certification
Legal basis	EU Directive 2014/68/EU (PED)	Voluntary; adopted by jurisdictions (NB-23, state laws)
Geographic requirement	Mandatory in EU/EEA	Required by US/Canadian jurisdictions and many global projects
Issuing authority	Manufacturer (self-declaration with Notified Body oversight)	ASME via Authorized Inspection Agency (AIA)
Scope	All pressure equipment > 0.5 bar PS	Boilers, pressure vessels, nuclear, piping (by code section)
Design codes accepted	EN 13445, EN 13480, ASME (with PMA)	ASME BPVC sections only
Material standards	EN harmonized standards; ASTM via PMA	ASME Section II listed materials
Third-party involvement	Notified Body (Categories II-IV)	AIA for all stamped equipment
Marking	CE mark on nameplate	ASME stamp symbol (U, S, PP, etc.)
Quality system	Module-dependent (ISO 9001 basis)	ASME QC manual reviewed by AIA
Documentation	EU Declaration of Conformity + Technical File	Manufacturer’s Data Report (MDR)
Penalties for non-compliance	Market withdrawal, fines, legal liability	Rejection by jurisdiction, loss of certificate
Renewal	Ongoing (Notified Body surveillance)	Triennial ASME audit

How Each System Works

CE Marking process:

1. Classify the equipment by PED category (I-IV) based on pressure, volume, and fluid group
2. Apply the appropriate conformity assessment module (A, A2, B+D, B+F, G, H, H1)
3. For Categories II-IV, engage a Notified Body for design review and manufacturing surveillance
4. Prepare a Technical File with design calculations, material certificates, test reports, and risk assessment
5. Issue the EU Declaration of Conformity and affix the CE mark

ASME Certification process:

1. Obtain an ASME Certificate of Authorization (requires QC manual review and audit)
2. Design equipment per the applicable ASME code section
3. Use ASME Section II approved materials with mill test certificates
4. Manufacture under AIA oversight with in-process inspections
5. Complete final inspection, hydrostatic testing, and Manufacturer’s Data Report
6. Apply the ASME stamp

Dual Compliance

Many international EPC projects require both CE Marking and ASME compliance, particularly for equipment manufactured in Asia or the Middle East destined for European or North American installations. Dual compliance requires:

• Materials acceptable under both systems (EN + ASME Section II, or ASTM with PMA for PED)
• Design calculations per the ASME code, supported by a PED conformity assessment
• Involvement of both a Notified Body and an AIA during fabrication
• Separate documentation sets (Technical File for PED; MDR for ASME)

Common Mistake

Assuming that CE Marking and ASME Certification are interchangeable. They are not. CE Marking is a legal market access requirement in the EU; ASME is a technical code compliance certification. A CE-marked vessel cannot be installed in a US jurisdiction that requires ASME stamps, and an ASME-stamped vessel cannot be placed on the EU market without CE Marking.

For a deeper explanation of CE Marking for steel products and its application to structural and piping materials, see the full reference guide.

Read the full guide to piping engineering