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About EN 1092-1 Type 01
The EN 1092-1 Type 01 flange is also known as a ‘plate flange for welding’. It is also commonly referred to as a ‘steel ring flange’ or ‘S/O plate flange’. It is a loose-type flange that is very similar to a slip-on flange, but without a hub. The Type 01 plate flange can be slipped onto the pipe prior to welding. Two fillet welds (one internal and one external) are required to join the pipe and the flange. It can be supplied with a flat face (FF) or a raised face (RF), depending on the buyer’s requirements. According to EN 1092-1, Type 01 plate flanges are available in eight pressure ratings: PN 2.5, PN 6, PN 10, PN 16, PN 25, PN 40, PN 63 and PN 100. The dimensions and weights of the corresponding flanges are listed in the tables below. All dimensions are in millimetres and masses/weights are in kilograms.
EN 1092-1 Type 01 plate flanges may be made from forgings or flat products (plates). They can also be machined from rolled or forged bars and forged section steel. For larger sizes, they can be bent and welded using electric welding from bars, section steel or strip. Flanges can be manufactured from a wide range of material grades, including carbon steel, low alloy steel, stainless steel, and other high-alloy steels.
Weld Neck Flange
WNRF-Weld Neck Flange is a high-pressure weld neck flange compliant with European standards, designed for demanding working conditions and widely used in chemical industries, energy systems, and more. Its core features include a weld neck structure and raised face sealing, ensuring pipeline sealing integrity and fatigue resistance under PN100 (10 MPa) pressure through full penetration welding.
The EN1092-1 PN100 WNRF flange is suitable for high-temperature, high-pressure, and corrosive environments, such as steam pipelines and reactor inlets/outlets in energy and chemical industries, or corrosive media like acidic fluids (e.g., sulfuric acid transport) and high-viscosity slurry pump/valve connections. It is also extensively used in shipbuilding and cryogenic engineering.
| Dimensions &Weights for EN 1092-1 Type 01 PN100 | ||||||||
| DN | R mm | K mm | D mm | Wt kg | ||||
| 10 | 40 | 70 | 100 | 1.00 | ||||
| 15 | 45 | 75 | 105 | 1.10 | ||||
| 20 | 58 | 90 | 130 | 1.86 | ||||
| 25 | 68 | 100 | 140 | 2.37 | ||||
| 32 | 78 | 110 | 155 | 2.79 | ||||
| 40 | 88 | 125 | 170 | 3.58 | ||||
| 50 | 102 | 145 | 195 | 4.99 | ||||
| 65 | 122 | 170 | 220 | 6.33 | ||||
| 80 | 138 | 180 | 230 | 7.72 | ||||
| 100 | 162 | 210 | 265 | 10.3 | ||||
| Seal surface with sealing face | ||||||||
| DN | n | d mm | f mm | C mm | ||||
| 10 | 4 | 14 | 2 | 20 | ||||
| 15 | 4 | 14 | 2 | 20 | ||||
| 20 | 4 | 18 | 2 | 22 | ||||
| 25 | 4 | 18 | 2 | 24 | ||||
| 32 | 4 | 22 | 2 | 24 | ||||
| 40 | 4 | 22 | 3 | 26 | ||||
| 50 | 4 | 26 | 3 | 28 | ||||
| 65 | 8 | 26 | 3 | 30 | ||||
| 80 | 8 | 26 | 3 | 34 | ||||
| 100 | 8 | 30 | 3 | 36 | ||||
Primary materials for the EN1092-1 PN100 WNRF flange include stainless steels 304, 304L, 316, 316L, 321, and 310S. These steels meet international standards, offer excellent corrosion resistance to various media, and demonstrate outstanding resistance to pitting and crevice corrosion in seawater and other chloride-containing environments. Among them, 316L stainless steel exhibits low thermal expansion and higher thermal conductivity than austenitic stainless steels, making it suitable for operating temperatures up to 300°C.
The key advantages of the EN1092-1 PN100 WNRF flange are its high-pressure sealing reliability and smooth transition at the weld neck, which reduces stress concentration and ensures suitability for vibrating and thermal cycling conditions. Owing to premium materials and specialized processing/heat treatment techniques, this flange delivers superior corrosion resistance and longevity compared to standard flanges.
Machining Ra(μm) Rz(μm)
drilled min.3,2/max.12,5 min.12,5/max.50
| Comparison of the designations acc.to the old DIN standard and the new EN standard: | |
| DIN 2526 EN 1092-1 | |
| Shape E Shape B2(only by arrangement!) DN 20 and DN 32 were recently added to EN 1092-1. | |
| In contrast to the DIN standard,EN-1092-1 only specifies the pipe connection dimensions of the ISO series. | |
| Otherwise,alldimensions of DIN EN-1092-1 are identical to the old DIN 2637. | |
| DN<40 | 2,0 mm |
| DN 58 -250 | 3,0 mm |
| DN>250 | 4,0 mm |
C&N Group is a manufacturer and supplier of EN 1092-1 PN100 flanges.We produce flanges in various specifications to meet diverse industrial needs. Our manufacturing adheres to ASME standards, and we conduct tensile tests to verify yield strength, tensile strength, and elongation limits. Additionally, visual inspections are performed to ensure flanges are free from surface defects such as cracks, folds, misalignment faults, pits, or porosity.
Please contact us immediately if needed.
