Without the specific content or context of Merkblatt W1, it's difficult to provide detailed insights. Generally, in the context of AD 2000, individual Merkblätter (which translates to "information sheets" or "guidelines") focus on specific aspects of pressure equipment design, fabrication, or inspection. For example, they might cover guidelines for the use of specific materials, welding practices, non-destructive testing methods, or safety factors to be considered in design.
Guidelines for material identification and quality certification. Where to Access the Document ad 2000 merkblatt w1 free