EN 1090 CE Marking for Storage Tanks: Compliance & Engineering Guide
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EN 1090 CE Marking for Storage Tanks: Compliance & Engineering Guide
For manufacturers and procurement officers operating in the European Economic Area (EEA), CE marking is not optional for structural steel components, including large-scale storage tanks. While design standards like EN 14015 or API 650 dictate how the tank is designed for service, EN 1090 dictates how the steel structure must be fabricated, inspected, and certified to be legally placed on the EU market.
1. The Regulatory Framework: Why EN 1090?
Under the EU Construction Products Regulation (CPR), any structural steel component used in a construction project must be CE marked. A storage tank shell, roof structure, and supporting framing are considered "structural steel components."
● EN 1090-1: The harmonized standard that defines the requirements for conformity assessment of structural components (the "how to CE mark" part).
● EN 1090-2: The technical requirements for the execution of steel structures (the "how to weld and build" part).
Critical Distinction: You cannot CE mark a tank based solely on API 650. You must perform the fabrication according to EN 1090 to obtain the CE mark, even if the structural design follows the calculations of a specific tank standard.
2. Understanding Execution Classes (EXC)
EN 1090 categorizes structures into Execution Classes (EXCs), ranging from EXC1 to EXC4. The higher the risk of failure, the higher the requirement for quality control, material traceability, and NDT (Non-Destructive Testing).
Execution Class | Typical Tank Application | Requirement Level |
EXC1 | Small, non-critical support structures | Basic |
EXC2 | Most industrial storage tanks | Standard (Most common) |
EXC3 | Large tanks, high-pressure, seismic zones | High (Strict NDT/Inspection) |
EXC4 | Exceptional risk (Nuclear, offshore) | Maximum |
● Impact: Most storage tanks fall under EXC2. If your tank is in a high-consequence area or holds hazardous materials, the engineer of record may specify EXC3.
3. The Path to CE Compliance
To legally apply the CE mark to a storage tank component, the manufacturer must implement a Factory Production Control (FPC) system and be audited by a Notified Body (NoBo).
1. FPC Setup: Document all procedures, including material handling, welding (WPS/WPQR), and staff competency.
2. Initial Type Testing (ITT): Validate that the design and fabrication processes meet the standard.
3. Audits: Engage a Notified Body to audit your FPC system.
4. Declaration of Performance (DoP): Once certified, issue a DoP and apply the CE mark to the product.
4. Frequently Asked Questions (FAQ)
Q: If I design to API 650, can I still CE mark my tank?
A: Yes. EN 1090 is an execution standard, not a design standard. You can design to API 650 or EN 14015, but you must ensure that your workshop fabrication processes (welding, cutting, bolting) are executed in compliance with EN 1090 to satisfy the structural safety requirements of the CE mark.
Q: Does EN 1090 replace API 650?
A: No. They serve different purposes. API 650 provides the structural formulas and design limits for the tank's service life. EN 1090 provides the quality management and fabrication protocols required by EU law for the physical steel structure.
Q: How do I handle stainless steel tanks under EN 1090?
A: EN 1090-2 covers carbon steel. For stainless steel, you must also refer to EN 1090-4 (Technical requirements for cold-formed stainless steel) to ensure your welding and surface finishing meet the necessary requirements.
Are you currently managing a tender for a storage facility in Europe, or are you a fabricator looking to audit your existing production line against EN 1090 standards?
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