The document applies to metallic materials as defined in EN 13445 (unfired pressure vessels) and EN 12952 (boilers). It explicitly covers materials for welded construction.
A critical part of the W0 sheet is the "Proof of Quality." Materials must be accompanied by specific documents: ad 2000-merkblatt w0 pdf
You cannot use a 3.1 certificate for a weld neck flange if the vessel design calls for 3.2. W0 explicitly forbids downgrading certificates. The document applies to metallic materials as defined
| Standard | Focus | |----------|-------| | AD 2000 W0 (presumed) | General rules for all W-series | | EN 13445-2 | Materials for unfired pressure vessels | | ASME II | Materials for ASME BPVC | W0 explicitly forbids downgrading certificates
: Implementation of appropriate processes specifically for the materials being produced. Qualified Personnel
: Guidance on choosing materials that are suitable for the intended operating conditions (pressure, temperature, and fluid).