ASME/ANSI B16.47 Series B Weld Neck Flange

Our company provides ASME/ANSI B16.47 Series B Weld Neck Flange.

ASME B16.47 Series B Weld Neck Flange covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges in sizes NPS 26 through NPS 60 and in rating Classes 75, 150, 300, 400, 600, and 900.

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ASME/ANSI B16.47 Flange Series B Weld Neck Flange

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ASME/ANSI B16.47 Class 75 Series B Welding Neck Flanges

(A)All dimensions are in inches.

(B)These flanges will be furnished with a 1/16″ raised face unless otherwise specified. For more alternate flange facings, please click here!

(C)Standard Bore will be furnished unless otherwise specified. For more diameter of holes, please click here!

Nominal Pipe SizeOutside Diameter (O)Bolt Circle (W)Raised Face Diameter (R)Number of HolesDiameter of HolesBore (B)Top of Hub (A)Hub Diameter (X)Minimum Fillet Radius (r)Minimum Thickness (T)Length Thru Hub (Y)Approximate Weight (lbs)
2630.0028.5027.75360.75Specified by purchaser26.0626.620.311.312.3180
2832.0030.5029.75400.75Specified by purchaser28.0628.620.311.312.4485
3034.0032.5031.75440.75Specified by purchaser30.0630.620.311.312.5690
3236.0034.5033.75480.75Specified by purchaser32.0632.620.311.382.75105
3438.0036.5035.75520.75Specified by purchaser34.0634.620.311.382.88110
3640.6939.0638.00400.88Specified by purchaser36.0636.810.381.443.38145
3842.6941.0640.00400.88Specified by purchaser38.0638.810.381.503.50160
4044.6943.0642.00440.88Specified by purchaser40.0640.810.381.503.62170
4246.6945.0644.00480.88Specified by purchaser42.0642.810.381.563.75185
4449.2547.3846.25361.00Specified by purchaser44.0644.880.381.694.12230
4651.2549.3848.25401.00Specified by purchaser46.0646.880.381.754.25245
4853.2551.3850.25441.00Specified by purchaser48.0648.880.381.814.38270
5055.2553.3852.25441.00Specified by purchaser50.0650.940.381.884.56290
5257.3855.5054.25481.00Specified by purchaser52.0652.940.381.884.75310
5459.3857.5056.25481.00Specified by purchaser54.0655.000.381.944.94340
5662.0059.8858.50401.12Specified by purchaser56.0657.120.442.005.31400
5864.0061.8860.50441.12Specified by purchaser58.0659.120.442.065.44430
6066.0063.8862.50441.12Specified by purchaser60.0661.120.442.195.69475

ASME/ANSI B16.47 Class 150 Series B Welding Neck Flanges

(A)All dimensions are in inches.

(B)These flanges will be furnished with a 1/16″ raised face unless otherwise specified. For more alternate flange facings, please click here!

(C)Standard Bore will be furnished unless otherwise specified. For more diameter of holes, please click here!

Nominal Pipe SizeOutside Diameter (O)Bolt Circle (W)Raised Face Diameter (R)Number of HolesDiameter of HolesBore (B)Top of Hub (A)Hub Diameter (X)Minimum Fillet Radius (r)Minimum Thickness (T)Length Thru Hub (Y)Approximate Weight (lbs)
2630.9429.3128.00360.88Specified by purchaser26.0626.940.381.623.50120
2832.9431.3130.00400.88Specified by purchaser28.0628.940.381.753.75140
3034.9433.3132.00440.88Specified by purchaser30.0631.000.381.753.94150
3237.0635.4434.00480.88Specified by purchaser32.0633.060.381.814.25170
3439.5637.6936.25401.00Specified by purchaser34.0635.120.381.944.34210
3641.6239.7538.25441.00Specified by purchaser36.0637.190.382.064.62240
3844.2542.1240.25401.12Specified by purchaser38.1239.250.382.124.88290
4046.2544.1242.50441.12Specified by purchaser40.1241.310.382.195.06310
4248.2546.1244.50481.12Specified by purchaser42.1243.380.442.315.25345
4450.2548.1246.50521.12Specified by purchaser44.1245.380.442.385.38370
4652.8150.5648.62401.25Specified by purchaser46.1247.440.442.445.69435
4854.8152.5650.75441.25Specified by purchaser48.1249.500.442.565.88480
5056.8154.5652.75481.25Specified by purchaser50.1251.500.442.696.06520
5258.8156.5654.75521.25Specified by purchaser52.1253.560.442.756.19550
5461.0058.7556.75561.25Specified by purchaser54.1255.620.442.816.38620
5663.0060.7558.75601.25Specified by purchaser56.1257.690.562.886.56650
5865.9463.4460.75481.38Specified by purchaser58.1259.690.562.946.88780
6067.9465.4463.00521.38Specified by purchaser60.1261.810.563.007.06850

ASME/ANSI B16.47 Class 300 Series B Welding Neck Flanges

(A)All dimensions are in inches.

(B)These flanges will be furnished with a 1/16″ raised face unless otherwise specified. For more alternate flange facings, please click here!

(C)Standard Bore will be furnished unless otherwise specified. For more diameter of holes, please click here!

Nominal Pipe SizeOutside Diameter (O)Bolt Circle (W)Raised Face Diameter (R)Number of HolesDiameter of HolesBore (B)Top of Hub (A)Hub Diameter (X)Minimum Fillet Radius (r)Minimum Thickness (T)Length Thru Hub (Y)Approximate Weight (lbs)
2634.1231.6229.00321.38Specified by purchaser26.1927.620.563.505.69400
2836.2533.7531.00361.38Specified by purchaser28.1929.750.563.505.88450
3039.0036.2533.25361.50Specified by purchaser30.2532.000.563.696.22550
3241.5038.5035.50321.62Specified by purchaser32.2534.000.624.066.62685
3443.6240.6237.50361.62Specified by purchaser34.2536.120.624.066.81750
3646.1242.8839.75321.75Specified by purchaser36.2538.000.624.067.12840
3848.1244.8841.75361.75Specified by purchaser38.2540.000.624.387.56915
4050.1246.8843.88401.75Specified by purchaser40.2542.000.624.567.81990
4252.5049.0046.00361.88Specified by purchaser42.3144.000.624.698.061135
4454.5051.0048.00401.88Specified by purchaser44.3146.190.625.008.441235
4657.5053.7550.00362.00Specified by purchaser46.3148.380.625.068.751470
4859.5055.7552.25402.00Specified by purchaser48.3150.310.625.068.811575
5061.5057.7554.25442.00Specified by purchaser50.3152.380.625.449.251710
5263.5059.7556.25482.00Specified by purchaser52.3154.440.625.629.561840
5465.8862.1258.25482.00Specified by purchaser54.3156.500.625.389.441980
5669.5065.0060.50362.38Specified by purchaser56.3158.810.696.0610.562595
5871.9467.4462.75402.38Specified by purchaser58.3160.940.696.0610.812770
6073.9469.4465.00402.38Specified by purchaser60.3162.940.695.9410.692870

ASME/ANSI B16.47 Class 400 Series B Welding Neck Flanges

(a)All dimensions are in inches.

(b)These flanges will be furnished with a 1/4″ raised face unless otherwise specified. For more alternate flange facings, please click here!

Nominal Pipe SizeOutside Diameter (O)Bolt Circle (W)Raised Face Diameter (R)Number of HolesDiameter of HolesBore (B)Top of Hub (A)Hub Diameter (X)Minimum Fillet Radius (r)Minimum Thickness (T)Length Thru Hub (Y)Approximate Weight (lbs)
2633.5030.7528.00281.50Specified by purchaser26.0027.120.443.505.88360
2836.0033.0030.00241.62Specified by purchaser28.0029.120.503.756.25450
3038.2535.2532.25281.62Specified by purchaser30.0031.250.504.006.69530
3240.7537.5034.38281.75Specified by purchaser32.0033.250.504.257.06635
3442.7539.5036.50321.75Specified by purchaser34.0035.380.564.387.38690
3645.5042.0038.62281.88Specified by purchaser36.0037.500.564.697.88855
3847.5044.0040.75321.88Specified by purchaser38.0039.500.564.888.12935
4050.0046.2543.00322.00Specified by purchaser40.0041.500.565.128.501090
4252.0048.2545.00322.00Specified by purchaser42.0043.620.565.258.811190
4454.5050.5047.25322.12Specified by purchaser44.0045.620.565.509.181375
4656.7552.7549.50362.12Specified by purchaser46.0047.750.565.759.621525
4859.5055.2551.50282.38Specified by purchaser48.0049.880.566.0010.121790
5061.7557.5053.62322.38Specified by purchaser50.0052.000.566.1910.561950
5263.7559.5055.62322.38Specified by purchaser52.0054.000.566.3810.882125
5467.0062.2557.88282.62Specified by purchaser54.0056.120.566.6911.382565
5669.0064.2560.12322.62Specified by purchaser56.0058.250.566.8811.752710
5871.0066.2562.12322.62Specified by purchaser58.0060.250.567.0012.063230
6074.2569.0064.38322.88Specified by purchaser60.0062.380.567.3112.563820

ASME/ANSI B16.47 Class 600 Series B Welding Neck Flanges

(a)All dimensions are in inches.

(b)These flanges will be furnished with a 1/4″ raised face unless otherwise specified. For more alternate flange facings, please click here!

Nominal Pipe SizeOutside Diameter (O)Bolt Circle (W)Raised Face Diameter (R)Number of HolesDiameter of HolesBore (B)Top of Hub (A)Hub Diameter (X)Minimum Fillet Radius (r)Minimum Thickness (T)Length Thru Hub (Y)Approximate Weight (lbs)
2635.0031.7528.62281.75Specified by purchaser26.0027.500.504.387.12550
2837.5034.0030.88281.88Specified by purchaser28.0029.620.504.567.50650
3040.2536.5033.12282.00Specified by purchaser30.0031.750.504.948.06810
3242.7538.7535.25282.12Specified by purchaser32.0033.880.505.128.50950
3445.7541.5037.50242.38Specified by purchaser34.0036.000.565.569.191205
3647.7543.5039.75282.38Specified by purchaser36.0038.120.565.759.561340
3850.0045.7541.50282.38Specified by purchaser38.0040.250.566.0010.001470
4052.0047.7543.75322.38Specified by purchaser40.0042.250.566.2510.381630
4255.2550.5046.00282.62Specified by purchaser42.0044.380.566.6211.002030
4457.2552.5048.25322.62Specified by purchaser44.0046.500.566.8111.382160
4659.5054.7550.25322.62Specified by purchaser46.0048.620.567.0611.812410
4862.7557.5052.50322.88Specified by purchaser48.0050.750.567.4412.442855
5065.7560.0054.50283.12Specified by purchaser50.0052.880.567.7512.943330
5267.7562.0056.50323.12Specified by purchaser52.0054.880.568.0013.253560
5470.0064.2558.75323.12Specified by purchaser54.0057.000.568.2513.753920
5673.0066.7560.75323.38Specified by purchaser56.0059.120.628.5614.254280
5875.0068.7563.00323.38Specified by purchaser58.0061.120.628.7514.564640
6078.5071.7565.25283.62Specified by purchaser60.0063.380.699.1915.315000

ASME/ANSI B16.47 Class 900 Series B Welding Neck Flanges

(a)All dimensions are in inches.

(b)These flanges will be furnished with a 1/4″ raised face unless otherwise specified. For more alternate flange facings, please click here!

Nominal Pipe SizeOutside Diameter (O)Bolt Circle (W)Raised Face Diameter (R)Number of HolesDiameter of HolesBore (B)Top of Hub (A)Hub Diameter (X)Minimum Fillet Radius (r)Minimum Thickness (T)Length Thru Hub (Y)Approximate Weight (lbs)
2640.2535.5030.00202.62Specified by purchaser26.0029.250.445.3110.191050
2843.5038.2532.25202.88Specified by purchaser28.0031.380.505.8110.881520
3046.5040.7534.50203.12Specified by purchaser30.0033.500.506.1211.381820
3248.7543.0036.50203.12Specified by purchaser32.0035.750.506.3111.942065
3451.7545.5039.00203.38Specified by purchaser34.0037.880.566.7512.562450
3653.0047.2540.50243.12Specified by purchaser36.0040.000.566.8112.812520
3857.5050.7543.25203.62Specified by purchaser38.0042.250.757.5013.883385
4059.5052.7545.75243.62Specified by purchaser40.0044.380.817.7514.313620
4261.5054.7547.75243.62Specified by purchaser42.0046.310.818.1214.623960
4464.8857.6250.00243.88Specified by purchaser44.0048.620.888.4415.384300
4668.2560.5052.50244.12Specified by purchaser46.0050.880.888.8816.184640
4870.2562.5054.50244.12Specified by purchaser48.0052.880.949.1916.504980

ASME/ANSI B16.47 Series B Weld Neck Flanges Main Features and Specifications Table

Here is a table outlining the specifications and characteristics of ASME/ANSI B16.47 Series B Weld Neck Flanges:

Specification/FeatureDescription
StandardASME/ANSI B16.47 Series B Weld Neck Flange.
TypeWeld Neck Flange – A type of flange with a long tapered neck that is butt-welded to the pipe, providing excellent strength and stress distribution.
Pressure RatingAvailable in various pressure ratings, such as 150, 300, 600, 900, etc., depending on the application requirements.
Size RangeTypically available in a wide range of sizes to accommodate different pipe and equipment dimensions.
MaterialCan be manufactured from a variety of materials, including carbon steel, stainless steel, alloy steel, etc., chosen based on application requirements.
Facing TypeSeries B Weld Neck Flanges typically have Raised Face (RF) facing, providing a reliable sealing surface.
Bolt Hole Quantity and DiameterThe number and diameter of bolt holes vary with flange size and pressure rating, facilitating flange connection.
Seal TypeSeries B Weld Neck Flanges commonly use gaskets or O-rings for sealing.
Performance CharacteristicsKnown for their high-pressure-bearing capacity, durability, and suitability for critical applications.
Application AreasWidely used in industries such as oil and gas, petrochemical, power generation, and more for connecting high-pressure piping systems.
Manufacturing StandardsManufactured in compliance with ASME/ANSI B16.47 Series B standard and relevant ASME codes.
ASME/ANSI B16.47 Series B Weld Neck Flanges Main Features and Specifications Table

This table provides a comprehensive overview of ASME/ANSI B16.47 Series B Weld Neck Flanges, including their specifications, characteristics, and application areas. Specific requirements may vary depending on the chosen flange size, pressure rating, and material.

ASME B16 47 Series A flanges are thicker, heavier, and stronger than their Series B counterparts. They also can often handle more external loading than Series B. Series A flanges tend to be more costly than Series B flanges.

Weld neck flange is available in both raised-face and flat-face configurations. Most common weld neck flanges have standard bore or extra heavy bore. Sch 120 or Sch 160 bore flanges in heavier weights such as 600# to 1500# are also common in weld neck flanges.

Any butt-weld fitting or weld-neck flange can be directly welded to any other butt-weld fitting or weld-neck flange without the need for any extra piece of pipe (Pup piece) between them.

Weld neck flanges are used in applications where the conditions are severe and critical. Some of these conditions include high pressure, wide fluctuations in temperature and pressure, high temperature, fluids that are volatile and hazardous, and temperatures in the sub-zero range.

The Weld Neck Flange offers increased strength under higher pressures, subzero or elevated temperatures that cause line expansion or retraction, or other variable forces. The Slip On Flange is connected to the pipe by two welds, one on the back side of the Flange and one on the inside of the Flange.

A Long Weld Neck Flange is an integral self-reinforcing Flange connection primarily for ASME Pressure Vessel applications. The Long Weld Neck (LWN) Flange was designed to be used in place of a Weld Neck Flange and a piece of pipe for a bolt-up connection to the vessel.