Weld Neck Flanges ASME B16.5 Class 900 lbs Manufacturer in China
Weld Neck Flanges ASME B16.5 Class 900 lbs are designed for high-pressure, high-temperature applications where strength, reliability, and long service life are critical. With a long tapered hub, weld neck flanges provide excellent stress distribution and superior resistance to fatigue, making them ideal for severe operating conditions.
Manufactured in accordance with ASME B16.5 standards, Class 900 weld neck flanges are widely used in oil & gas, petrochemical, power generation, chemical processing, and offshore industries
We are a reputable manufacturer and global supplier of ASME B16.5 Class 900 Weld Neck Flanges, offering forged steel flanges for high-pressure pipeline systems. Our Class 900 WN flanges are precision-engineered for critical applications in oil & gas, petrochemicals, refineries, and offshore industries.
What is ASME B16.5 Class 900 Weld Neck Flange?
A Weld Neck Flange (WN flange) is designed with a long tapered hub for butt-welded connections, ensuring excellent stress distribution and resistance to fatigue and corrosion. The Class 900 pressure rating, as per ASME B16.5, denotes high-pressure service capability — typically for use in systems requiring durability at elevated pressures and temperatures.
Product Scope – ASME B16.5 Class 900 Weld Neck Flanges
- Flange Type: Weld Neck (WN)
- Pressure Rating: Class 900 (900 lbs)
- Size Range: ½” – 24″
- Dimensional Standard: ASME B16.5
- Facing Types:
- Raised Face (RF)
- Ring Type Joint (RTJ)
- End Preparation: Beveled for butt welding (ASME B16.25)
Weld neck flanges (WN )
Also known as Butt weld flanges. Their long necks are butt welded to a pipe. The flange’s bore matches that of the pipe, reducing turbulence and erosion. This flanged connection relocates stress to the pipes, ensuring a decrease in high-stress concentration at the bottom of the flange. When installing, weld neck pipe flanges must be positioned parallel at the time of fitting. Flanges at opposite ends of a pipe should typically have the same bolt-hole direction too.
DIMENSIONS and Weight OF WELD NECK FLANGES ASME B16.5 CLASS 900 LBS
- ANSI B16.5 Class 900 Flanges | Welding Neck
| Nominal Pipe Size | Outside Diameter (O) | Bolt Circle (W) | Raised Face Diameter (R) | Number of Holes | Diameter of Holes | Bore (B) | Point of Weld (A) | Hub Diameter (X) | Thickness (T) | Length Thru Hub (Y) | Approximate Weight (lbs) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 4.75 | 3.25 | 1.38 | 4 | 0.88 | Specified by purchaser | 0.84 | 1.50 | 0.88 | 2.38 | 5 |
| 3/4 | 5.12 | 3.50 | 1.69 | 4 | 0.88 | Specified by purchaser | 1.05 | 1.75 | 1.00 | 2.75 | 6 |
| 1 | 5.88 | 4.00 | 2.00 | 4 | 1.00 | Specified by purchaser | 1.32 | 2.06 | 1.12 | 2.88 | 9 |
| 1 1/4 | 6.25 | 4.38 | 2.50 | 4 | 1.00 | Specified by purchaser | 1.66 | 2.50 | 1.12 | 2.88 | 10 |
| 1 1/2 | 7.00 | 4.88 | 2.88 | 4 | 1.13 | Specified by purchaser | 1.90 | 2.75 | 1.25 | 3.25 | 13 |
| 2 | 8.50 | 6.50 | 3.62 | 8 | 1.00 | Specified by purchaser | 2.38 | 4.12 | 1.50 | 4.00 | 25 |
| 2 1/2 | 9.62 | 7.50 | 4.12 | 8 | 1.13 | Specified by purchaser | 2.88 | 4.88 | 1.62 | 4.12 | 36 |
| 3 | 9.50 | 7.50 | 5.00 | 8 | 1.00 | Specified by purchaser | 3.50 | 5.00 | 1.50 | 4.00 | 31 |
| 4 | 11.50 | 9.25 | 6.19 | 8 | 1.25 | Specified by purchaser | 4.50 | 6.25 | 1.75 | 4.50 | 53 |
| 5 | 13.75 | 11.00 | 7.31 | 8 | 1.38 | Specified by purchaser | 5.56 | 7.50 | 2.00 | 5.00 | 86 |
| 6 | 15.00 | 12.50 | 8.50 | 12 | 1.25 | Specified by purchaser | 6.63 | 9.25 | 2.19 | 5.50 | 110 |
| 8 | 18.50 | 15.50 | 10.62 | 12 | 1.50 | Specified by purchaser | 8.63 | 11.75 | 2.50 | 6.38 | 175 |
| 10 | 21.50 | 18.50 | 12.75 | 16 | 1.50 | Specified by purchaser | 10.75 | 14.50 | 2.75 | 7.25 | 260 |
| 12 | 24.00 | 21.00 | 15.00 | 20 | 1.50 | Specified by purchaser | 12.75 | 16.50 | 3.12 | 7.88 | 325 |
| 14 | 25.25 | 22.00 | 16.25 | 20 | 1.63 | Specified by purchaser | 14.00 | 17.75 | 3.38 | 8.38 | 400 |
| 16 | 27.75 | 24.25 | 18.50 | 20 | 1.75 | Specified by purchaser | 16.00 | 20.00 | 3.50 | 8.50 | 495 |
| 18 | 31.00 | 27.00 | 21.00 | 20 | 2.00 | Specified by purchaser | 18.00 | 22.25 | 4.00 | 9.00 | 680 |
| 20 | 33.75 | 29.50 | 23.00 | 20 | 2.13 | Specified by purchaser | 20.00 | 24.50 | 4.25 | 9.75 | 830 |
| 24 | 41.00 | 35.50 | 27.25 | 20 | 2.63 | Specified by purchaser | 24.00 | 29.50 | 5.50 | 11.50 | 1500 |
Download WELD NECK FLANGES ASME B16.5 CLASS 900 LBS Dimension PDF
Class 900 Weld Neck Flanges Material
Carbon Steel
- ASTM A105 / A105N Weld neck Flanges Class 900 lbs
- ASTM A350 LF2 Weld neck Flanges Class 900 lbs (Low Temperature)
- ASTM A694 F52 / F60 / F65 Weld neck Flanges Class 900 lbs
Stainless Steel
- ASTM A182 F304 / F304L Weld neck Flanges Class 900 lbs
- ASTM A182 F316 / F316L Weld neck Flanges Class 900 lbs
- ASTM A182 F321 / F347 Weld neck Flanges Class 900 lbs
Alloy Steel
- ASTM A182 F11 / F12 / F22 Weld neck Flanges Class 900 lbs
- ASTM A182 F5 / F9 / F91 Weld neck Flanges Class 900 lbs
Duplex & Super Duplex Steel
- ASTM A182 F51 (UNS S31803) Weld neck Flanges Class 900 lbs
- ASTM A182 F53 / F55 (UNS S32760 / S32750) Weld neck Flanges Class 900 lbs
Nickel Alloys & Others
- ASTM B564 N06600, N06625, N08825
- Copper Nickel C70600 / C71500
- Monel®, Hastelloy®, Inconel®, etc.
Weld neck flanges Cl 1500 Tests & Certifications
- Ultrasonic & Dye Penetrant (NDT)
- PMI (Positive Material Identification)
- Hardness & Mechanical Tests
- NACE MR0175, PED, and 3.1 MTC
Download the Dimension of ASME B16.5 Weld neck Flange
⬇️ Download Dimension of Weld Neck flanges Class 150 lbs ASME B16.5 PDF
⬇️ Download Dimension of Weld Neck flanges Class 300 lbs ASME B16.5 PDF
⬇️ Download Dimension of Weld Neck flanges Class 400 lbs ASME B16.5 PDF
⬇️ Download Dimension of Weld Neck flanges Class 600 lbs ASME B16.5 PDF
⬇️ Download Dimension of Weld Neck flanges Class 900 lbs ASME B16.5 PDF
⬇️ Download Dimension of Weld Neck flanges Class 1500 lbs ASME B16.5 PDF
⬇️ Download Dimension of Weld Neck flanges Class 2500 lbs ASME B16.5 PDF
API and ASME/ANSI flanges – comparing dimensions and pressure ratings.
| Flange | Pressure Class Rating (psi) | Nominal Size Range (inches) | ||
|---|---|---|---|---|
| ASME/ANSI B16.5 | API 6A | ASME/ANSI B16.5 | API 6A1) | |
| Weld neck | 600 | 2000 | 1/2 – 24 | 113/16 – 11 |
| 900 | 3000 | |||
| 1500 | 5000 | |||
| Blind and Threaded | 600 | 2000 | 113/16 – 211/4 | |
| 900 | 3000 | 113/16 – 203/4 | ||
| 1500 | 5000 | 113/16 – 11 | ||
Looking for a reliable manufacturer of ASME B16.5 Class 900 Weld Neck Flanges? we deliver quality, precision, and reliability with every flange.contact us for a quote.
