Specifications:
The document outlines specifications for pipes and tubes according to DIN 11866 and DIN 11850 Series 2 standards. It includes details on clamp fittings and welding flanges, specifying surface roughness (Ra) values of less than 0.8 μm and 0.4 μm for different hygienic classes.

Procedures:
The document provides detailed measurements and specifications for various sizes of welding flanges and clamp fittings, including parameters such as diameter (D), wall thickness (w), and length (L). These are categorized by nominal pressure (PN) and nominal width (NW) or diameter (DN).

Standards and Norms:
The document adheres to DIN and ISO standards, specifically mentioning DIN 32676, ISO EN ISO 1127, and INCH ISO 2852. It specifies hygienic classes H3 and H4, with internal and external surface finish requirements.

Recommendations:
The document suggests using specific materials (1.4404 and 1.4435) for different applications, emphasizing the importance of surface finish for hygienic applications. It also highlights the use of short (S) and orbital welding (L) options for certain fittings.

Data Summary:
The tables provide comprehensive data on various fittings, including dimensions and material specifications. Key data points include the nominal size, diameter, wall thickness, and length, which are critical for selecting the appropriate fitting for specific applications.