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Neck butt welding flange is a kind of pipe fittings, which refers to the flange with neck and circular pipe transition and butt welded with the pipe. The flange is not easy to deform, has good sealing and is widely used. It has corresponding rigidity and elasticity requirements and reasonable butt welding thinning transition. The distance between the welded junction and the joint surface is large, and the joint surface is free from welding temperature deformation.
Neck butt welding flange adopts a complex trumpet structure, which is suitable for pipelines with large fluctuation of pressure or temperature or pipelines with high temperature, high pressure and low temperature. It is generally used for the connection of pipelines and valves with PN greater than 2.5MPa; It is also used for pipelines conveying expensive, flammable and explosive media.
Diameter: DN15 - DN300
Material: SS304, SS316
Pressure: 2.5MPa - 10MPa
Standards: ASTM / ANSI, ISO, DIN
ASTM B16.5 Stainless Steel Flanges Neck butt welding flange technical data sheet as below:
| DN | Pipe outer diameter A1 | Connection size | Flange thickness | Flange ID B1 | Theoretical weight | ||||||
| A | B | D | K | L | M | TH | C | A | B | KG | |
| 15 | 21.3 | 18 | 95 | 65 | 14 | 4 | M12 | 14 | 22 | 19 | 0.68 |
| 20 | 26.9 | 25 | 105 | 75 | 14 | 4 | M12 | 16 | 27.5 | 26 | 0.94 |
| 25 | 33.7 | 32 | 115 | 85 | 14 | 4 | M12 | 16 | 34.7 | 33 | 1.12 |
| 32 | 42.4 | 38 | 140 | 100 | 18 | 4 | M16 | 18 | 43.5 | 39 | 1.86 |
| 40 | 48.3 | 45 | 150 | 110 | 18 | 4 | M16 | 18 | 49.5 | 46 | 2.12 |
| 50 | 60.3 | 57 | 165 | 125 | 18 | 4 | M16 | 20 | 61.5 | 59 | 2.77 |
| 65 | 76.1 | 76 | 185 | 145 | 18 | 4 | M16 | 20 | 77.5 | 78 | 3.31 |
| 80 | 88.9 | 89 | 200 | 160 | 18 | 8 | M16 | 20 | 90.5 | 91 | 3.59 |
| 100 | 114.3 | 108 | 220 | 180 | 18 | 8 | M16 | 22 | 116 | 110 | 4.57 |
| 125 | 139.7 | 133 | 250 | 210 | 18 | 8 | M16 | 22 | 141.5 | 135 | 5.65 |
| 150 | 168.3 | 159 | 285 | 240 | 22 | 8 | M20 | 24 | 170.5 | 161 | 7.61 |
| 200 | 219.1 | 219 | 340 | 295 | 22 | 8 | M20 | 24 | 221.5 | 222 | 9.24 |
| 250 | 273 | 273 | 395 | 350 | 22 | 12 | M20 | 26 | 276.5 | 247 | 11.9 |
| 300 | 323.9 | 325 | 445 | 400 | 22 | 12 | M20 | 28 | 327.5 | 328 | 14.6 |
Neck butt welding flange is an integral flange. Due to the transition structure and butt welding connection of the cone neck, the strength and stiffness of the flange are strengthened, and the tightness is better than that of the flat welding flange.
Neck butt welding flange is widely used in petroleum, chemical industry, metallurgy, electric power, shipbuilding, natural gas, pipeline and other industries.
