Hebei Shengtian Pipe Fittings Group Co., Ltd.
Hebei Shengtian Pipe Fittings Group Co.,Ltd. Base on China,Service the world
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ASME B16.47 A694 F60 65 70 150lb 300lb Carbon Steel Weld Neck Flange
A weld neck flange is a type of flange. There are two designs. The regular type is used with pipes. The long type is unsuitable for pipes and is used in process plant. A weld neck flange consists of a circular fitting with a protruding rim around the circumference. Generally machined from a forging, these flanges are typically butt welded to a pipe. The rim has a series of drilled holes that permit the flange to be affixed to another flange with bolts.
Such weld neck flanges are suitable for use in hostile environments that have extremes of temperature, pressure or other sources of stress. The resilience of this type of weld neck flange is achieved by sharing the environmental stress with the pipe with which it is welded.This type of weld neck flange has been used successfully at each field.
Class 150 Weld Neck Flange Stud & Bolt Dimensions
| Size in Inch | Size in mm | No of Bolts | Bolt Size UNC | Machine Bolt Length | RF Stud Length | Hole Size | ISO Stud Size | Weight in kg |
| 1/2 | 15 | 4 | 1/2 | 50 | 55 | 5/8 | M14 | 0.6 |
| 3/4 | 20 | 4 | 1/2 | 50 | 65 | 5/8 | M14 | 0.9 |
| 1 | 25 | 4 | 1/2 | 55 | 65 | 5/8 | M14 | 1.4 |
| 1 1/4 | 32 | 4 | 1/2 | 55 | 70 | 5/8 | M14 | 1.4 |
| 1 1/2 | 40 | 4 | 1/2 | 65 | 70 | 5/8 | M14 | 1.8 |
| 2 | 50 | 4 | 5/8 | 70 | 85 | 3/4 | M16 | 2.7 |
| 2 1/2 | 65 | 4 | 5/8 | 75 | 90 | 3/4 | M16 | 3.7 |
| 3 | 80 | 4 | 5/8 | 75 | 90 | 3/4 | M16 | 4.6 |
| 3 1/2 | 90 | 8 | 5/8 | 75 | 90 | 3/4 | M16 | 5.5 |
| 4 | 100 | 8 | 5/8 | 75 | 90 | 3/4 | M16 | 6.8 |
| 5 | 125 | 8 | 3/4 | 85 | 95 | 7/8 | M20 | 8.7 |
| 6 | 150 | 8 | 3/4 | 85 | 100 | 7/8 | M20 | 10.9 |
| 8 | 200 | 8 | 3/4 | 90 | 110 | 7/8 | M20 | 17.7 |
| 10 | 250 | 12 | 7/8 | 100 | 115 | 1 | M24 | 24 |
| 12 | 300 | 12 | 7/8 | 100 | 120 | 1 | M24 | 37 |
| 14 | 350 | 12 | 1 | 115 | 135 | 1 1/8 | M27 | 50 |
| 16 | 400 | 16 | 1 | 115 | 135 | 1 1/8 | M27 | 64 |
| 18 | 450 | 16 | 1 1/8 | 125 | 145 | 1 1/4 | M30 | 68 |
| 20 | 500 | 20 | 1 1/8 | 140 | 160 | 1 1/4 | M30 | 82 |
| 24 | 600 | 20 | 1 1/4 | 150 | 170 | 1 3/8 | M33 | 118 |
Manufacturer of weld neck flange
These weld neck flanges attach by welding the pipe to the weld neck of the flange. This transfers stress from the weld neck flange to the pipe instead. It also reduces the stress concentration from the base of the hub. Weld neck flanges are often used for applications where high pressure is a factor. The inside diameter of the weld neck flange is designed to match the pipe's inside diameter. Weld Neck Pipe flanges with a hub have published specifications that range from 1/2" thru 96". Our company provides these in all material grades, specifications and sizes.
Weld neck pipe flanges are typically provided with a raised face, flat face, or RTJ facing. When a raised face is necessary for weld neck pipe flanges, the standard height is 1/16" for weld neck pipe flanges under 400#. For weld neck pipe flanges of 400# and up, the standard weld neck pipe flange raised face height is 1/4".
Hebei shengtian pipe-fitting group Co., ltd. manufactures weld neck pipe flanges in all steel material grades, including carbon weld neck pipe flanges, stainless steel weld neck pipe flanges and alloy weld neck pipe flanges. Hebei shengtian pipe-fitting group Co., ltd Flange also has many different weld neck pipe flanges in stock and ready to ship. Weld neck pipe flanges in stock include ANSI B16.5 weld neck pipe flanges, ASME B16.47 Series "A" weld neck pipe flanges, ASME B16.47 Series "B" weld neck pipe flanges, Pressure Vessel weld neck pipe flanges. Hebei shengtian pipe-fitting group Co., ltd Flanges also manufactures custom weld neck pipe flanges per customer requirements.
