Marking and Use of Weld Neck Flange
DIN 2633 PN16 Sch30 Stainless Steel Weld Neck Flange shall be marked according to nominal diameter, nominal pressure, sealing surface form code, matched steel pipe series code (matched with metric pipe code "Series 2", matched with British pipe not marked) and standard number.
Weld Neck Flange Examples of marking: 80 mm nominal diameter, 4.0 MPa nominal pressure (25bar) convex face welded steel pipe flange (with metric pipe)
Weld Neck Flange DN80-PN40 M (Series 2) GB/T9115.2-2000
Weld Neck Flanges of flat welded steel pipe with protruding face and neck with nominal diameter of 100mm and nominal pressure of 5.0MPa (25bar) (with English pipe)
Flange is a kind of disc-shaped parts, which is most common in pipeline engineering. Flanges are used in pairs.
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