A welding neck flange (also called a ‘weld neck flange’) is well recognized for its long-tapered hub, which provides mechanical strength (useful to resist ‘dishing’ and ‘bowing’). Welding neck flanges are high integrity flanges and are available in all sizes, all common face types (flat, raised, RTJ), and all classes. Due to the strength of the hub and the integrity of the weld, this type of flange is well suited for elevated temperature and pressure applications.
|
|
|
|
Welding Neck Flange Cross Section: 1. Weld Neck Flange; 2. Butt Weld; 3. Pipe or Fitting |
|
A butt weld, also known as V-weld or groove weld, provides single full weld penetration and is used to connect the welding neck flange to a pipe or fitting. The single full weld penetration makes this type of flange suitable for severe operating conditions, such as high-pressure systems, sub-zero temperatures, and elevated temperatures. Other welding neck flange benefits include:
* Excellent stress-distribution along the tapered hub.
* Unrestricted flow with a low pressure drop across the valve (low delta P).
* High cyclical loading capability.
* Causes minimal turbulence.
* Low erosion rates.
* Means for a direct connection to elbows, tees, or reducers.
* On larger diameter flanges, there is more available space to perform non-destructive testing on the weld (difficult on some flange designs due to the location of the weld).
* High resistance to bending moments due to the long hub.
The unrestricted flow and low turbulence characteristics of a welding neck flange are linked to the low pressure drop across the flange; this is because the flange bore is the same as the pipe bore. Erosions rates are also linked to the pressure drop across the flange, although the erosion rate depends heavily upon what is flowing through the flange.
This type of flange has one significant disadvantage compared to other flange types, it is more expensive (a deciding factor for most companies).
Non-Destructive Testing (NDT) Techniques
A phased array (ultrasonic NDT technique) flange face corrosion inspection can be conducted on welding neck flanges; the results reveal any internal damage on the sealing face.
Magnetic particle inspection (MPI), dye penetrant inspection (DPI), radiographic testing (RT) and/or ultrasonic testing (UT) can be used to prove the butt weld.
ASME Standards
The standards ASME B16.5 and ASME B31.3 specify the requirements for welding neck flange installation, maintenance, and testing.
SSM manufactures flanges in all material grades, including Hastelloy C276 C22 B2 B3 C2000 X, Inconel600 601 625, Incoloy800 800H 800HT 826 926, Monel400, Alloy 20, Alloy 31, duplex stainless steel S32205 S31803 S32750 904L 254SMO, stainless steel 304 304L 304H 316 316L 316H 316Ti 317 317L 347 347H 310 310H, Alloy steel A182 F5 F9 F11 F12 F22 F91, Carbon steel A694 F42 F52 F65 F70 A105N A350 LF2 LF3, Titanium Gr.2, etc.
Standard Specification For Weld Neck Flanges
|
Dimensions |
ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings |
|
Size |
1/2" (15 NB) to 48" (1200NB) |
|
Class |
150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc. |
|
DIN |
DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636,DIN2637, DIN2638, DIN2673 |
|
BS |
BS4504 , BS4504, BS1560, BS10 |
|
Flange Face Type |
Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
Material & Grades of Weld Neck Flanges (WNRF)
|
Stainless Steel Weld Neck Flanges |
ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L |
|
Duplex & Super Duplex Steel Weld Neck Flanges |
ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61 |
|
Carbon Steel Weld Neck Flanges |
ASTM / ASME A/SA 105 ASTM / ASME A 350 , ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F706 |
|
Low Temperature Carbon Steel Weld Neck Flanges |
ASTM A350, LF2, LF3 |
|
Alloy Steel Weld Neck Flanges |
ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91 |
|
Copper Alloy Steel Weld Neck Flanges |
ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200 |
|
Nickel Alloy Weld Neck Flanges |
ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020) |
ASME B16.5 Raised Faced Weld Neck Flanges Available Types
|
Weld Neck Raised Face Flange |
Raised Faced Weld Neck Flanges |
|
ANSI B16.5 Weld Neck Flanges |
Weld Neck Flange Dimensions |
|
ASME B16.5 WNRF Flanges |
ANSI B16.5 Class 150 Weld Neck Flanges |
|
Stainless Steel Weld Neck Flanges Suppliers |
SS Weld Neck Flange |
|
Weld Neck Plate Flanges Dealer |
ASME B16.47 Series A and B WNRF Flanges Exporter |
|
ANSI B16.5 class 150 WNRF Flange Stockholder |
ANSI 150 Weld Neck Flange Distributors |
|
Carbon Steel Weld Neck Flange |
High Quality WNRF Flanges Manufacturer |
|
ASTM A182 Stainless Steel WNRF Flange |
Duplex Steel Weld Neck Flange |
|
Super Duplex Steel Weld Neck Forged Flange |
Copper Nickel Weld Neck Pipe Flanges |
|
High Nickel Alloy WNRF Flanges |
Hastelloy Flat Faced Weld Neck Flanges Stockist |
|
Titanium ASME B16.47 Series A and B WNRF Flanges |
Inconel Weld Neck Flanges |
ANSI B16.5 Weld Neck Flanges Application
ASME B16.5 Weld Neck Flanges are known to deliver exceptional performance and are generally developed for meeting the demands. We offer a broad range of Flat Faced Weld Neck Flanges through a worldwide network of stock-keeping branches. These Weld Neck Flange is use in various industries like :
Stainless Steel Weld Neck Flanges uses in Oil and Gas Pipeline
Weld Neck Raised Face Flanges uses in Chemical Industry
Alloy Steel WNRF Flanges uses in Plumbing
Flat Faced Weld Neck Flanges uses in Heating
Weld Neck Pipe Flanges uses in Water Supply Systems
ANSI B16.5 Weld Neck Forged Flanges uses in Power Plant
Weld Neck Plate Flanges uses in Paper & Pulp Industry
Weld Neck Flange uses in General Purpose Applications
Steel Weld Neck Flanges uses in Fabrication Industry
Weld Neck Flange uses in Food Processing Industry
Weld Neck Flanges uses in Structural Pipe
