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China EN10312 Welded stainless steel tubes for the conveyance of aqueous liquids including water for human consumption – Technical delivery conditions Manufacturers, Supplier
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China EN10312 Welded stainless steel tubes for the conveyance of aqueous liquids including water for human consumption – Technical delivery conditions Manufacturers, Supplier
Scope  EN 10312 specifies requirements for welded stainless steel tubes used in water supply systems, including drinking water, industrial water, and other aqueous liquids. It covers tubes for pressure and non-pressure applications.
Non-destructive testing (NDT) (eddy current, ultrasonic, or radiographic testing).
Hydrostatic/pressure testing (optional, per customer request).
Corrosion tests (if specified, e.g., intergranular corrosion test per EN ISO 3651-2).
Marking & Certification
Tubes must be marked with:
Manufacturer’s name/logo
Steel grade
Dimensions
Standard number (EN 10312)
Inspection Certificate 3.1 or 3.2 (EN 10204) may be required.
Packaging & Delivery
Protection against mechanical damage and corrosion (e.g., plastic caps, waterproof wrapping).
Key Updates in Latest Version (2023)
Revised corrosion resistance criteria.
Enhanced NDT requirements for welded seams.
Updated references to harmonized standards (e.g., EN 10088).
Frequently Asked Questions
1. What is the primary application of EN 10312 stainless steel tubes?
EN 10312 tubes are specifically designed for the conveyance of aqueous liquids, including water intended for human consumption, ensuring high hygiene and corrosion resistance.
2. Which steel grades are most commonly used for these tubes?
The most common grades are austenitic stainless steels like 1.4301 (AISI 304) and 1.4404 (AISI 316L), as well as duplex grades like 1.4462 for more demanding environments.
3. Does the standard require pressure testing?
Yes, hydrostatic or pressure testing can be performed as part of the inspection process per customer request to ensure the integrity of the welded tubes under operating conditions.
4. What type of surface finishes are available?
Tubes can be supplied with various finishes depending on the application, including pickled, bright annealed, or mechanically polished surfaces.
5. How are the tubes protected during shipping?
To prevent mechanical damage and surface contamination, tubes are typically protected with plastic end caps and waterproof wrapping or wooden crates as specified in the order.
6. What certification is provided with the delivery?
Most orders are accompanied by an Inspection Certificate 3.1 or 3.2 according to EN 10204, confirming compliance with chemical and mechanical requirements.
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