Weld Neck Flange is flanges that designed to be joined to a piping system by butt welding. This kind of flange include lots of specification,Weld neck Flange is expensive because of its long neck and cost of people for contact WN flange with pipeline or fitting, but is preferred for high stress applications. The necks, or hubs, transmits stresses to the pipeline. The gradual transition of thickness from the base of the hub to the wall thickness at the butt weld provides important reinforcement of the Weld Neck flange. The bore of Weld-Neck flange matches bore of the pipeline, reducing turbulence and erosion.
Details of Welding Neck flange
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| 1. Weld Neck flange 2. Butt Weld 3. Pipe or Fitting |
The long tapered hub provides an important reinforcement for use in several applications involving high pressure, sub-zero and / or elevated temperatures. The smooth transition from flange thickness to pipe or fitting wall thickness effected by the taper is extremely beneficial, under conditions of repeated bending, caused by line expansion or other variable forces.
These flanges are bored to match the inside diameter of the mating pipe or fitting so there will be no restriction of product flow. This prevents turbulence at the joint and reduces erosion. They also provide excellent stress distribution through the tapered hub and are easily radiographed for flaw detection.
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| Weld Neck Orifice Run |
This flange type will be welded to a pipe or fitting with a single full penetration, V weld (Buttweld).
Standards, Dimensions & Weight
- ASME/ANSI B16.5 Class 150 WN
- ASME/ANSI B16.5 Class 300 WN
- ASME/ANSI B16.5 Class 600 WN
- ASME/ANSI B16.5 Class 900 WN
- ASME/ANSI B16.5 Class 1500 WN
- ASME/ANSI B16.5 Class 2500 WN
- ASME B16.47 Series A/MSS SP-44 Class 150 WN
- ASME B16.47 Series A/MSS SP-44 Class 300 WN
- ASME B16.47 Series A/MSS SP-44 Class 600 WN
- ASME B16.47 Series A/MSS SP-44 Class 900 WN
- ASME B16.47 Series B/API 605 Class 75 WN
- ASME B16.47 Series B/API 605 Class 150 WN
- ASME B16.47 Series B/API 605 Class 300 WN
- ASME B16.47 Series B/API 605 Class 600 WN
- ASME B16.47 Series B/API 605 Class 900 WN
- BS 3293 Class 150 WN
- BS 3293 Class 300 WN
- BS 3293 Class 600 WN
- DIN 2631 PN 6
- DIN 2632 PN 10
- DIN 2633 PN 16
- DIN 2634 PN 25
- DIN 2635 PN40
Type: WN Forged Flange
Material: Carbon steel: A105,SS400,SF440 RST37.2,S235JRG2,P250GH,C22.8, Stainless Steel: F304 F304L F316 F316L 316Ti, Copper etc.
Standard: ANSI,JIS,DIN,BS4504,SABS1123,EN1092-1, UNI,AS2129,GOST-12820
Size: 1/2-78 inch (DN15-DN2000)
Pressure: ANSI class 150,300,600,1500,2500, DIN PN6,PN10,PN16,PN25,PN40,PN64,PN100,PN160
Packing: No Fumigate or Fumigate Plywood/Wood Pallet or Case
Surface Treatment: Anti-rust Oil, Transparent/Yellow/Black Anti-rust Paint,Zinc,Hot dipped Galvanized.
E-catalogue: Available , please visit catalogue of flange
Usage: Oil Field, Offshore, Water System, Shipbuilding, Natural Gas, Electric Power, Pipe Projects etc.
Stainless Steel : ASTM A 182, A 240
Grade : F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904L, Duplex stainless steel UNS S31803, 2205, Super Duplex stainless steel UNS S32750
Carbon Steel : ASTM A 105, ASTM A 181
Alloy Steel : ASTM A 182, GR F1, F11, F22, F5, F9, F91
Nickel Alloys : Monel 400 & 500, Inconel 600 & 625, Incolloy 800, 825, Hastelloy C22,C276
Copper Alloys : Copper, Brass & Gunmetal
Size : 1/8" NB TO 48"NB.
Class : 150#, 300#,400 #,600#,900#, 1500# & 2500 #.
Standard
ANSI : ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48
DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673
B.S : BS4504 , BS4504, BS1560, BS10
The Types and Uses of Weld Neck Flanges
Weld neck flanges have long tapered hubs that are butt welded to a pipe or fitting. The conditions they are used in are usually severe. Conditions are sometimes constant or have wide fluctuations.The Two Types of Weld Neck Flanges
There are two types of weld neck flanges, which are standard and long. Standard weld neck flanges are used in butt weld fittings. Long weld neck flanges are used with vessel nozzles and equipment. The flanges are created to match the pipe’s inside diameter or fitting. The reason why it is bored to match is because it reduces the corrosion and turbulence that takes place inside of the pipe.
Long Neck Welding (abbreviated LWN) flanges are similar to a standard
Welding Neck flange, but the "Neck" is considerably longer. This type is
often used as a nozzle for a barrel or column. In addition, there are
the type LWN Heavy Barrel (HB) and the Equal LWN Barrel (E); they have a
different shape and a thicker "Wall".
Long weld neck flanges are called by this name due to their longer
neck as compared to standard flanges. These flanges are used in
applications as nozzles for columns or barrels.
