ASME/ANSI B16.5 Lap Joint Flanges

Our company provides ASME/ANSI B16.5 Lap Joint Flanges.

The lap joint flange is designed to be used with a stub end, which is a short piece of pipe that has a welded-on flange. The lap joint flange slides over the stub end and is then bolted in place. It is commonly used in applications where frequent disassembly and cleaning are required, such as in food processing or pharmaceutical industries.

  • ASME B16.47 Flange  Class 150-900 Series A – 26″to 60″
  • ASME B16.47 Flange  Class 75-900 Series B – 26″to 60″
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ASME/ANSI B16.5 Lap Joint Flanges

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ASME/ANSI B16.5 Class 150 Lap Joint Flanges

(a)All dimensions are in inches.

Nominal Pipe SizeOutside Diameter (O)Bolt Circle (W)Radius (r)Number of HolesDiameter of HolesHub Diameter (X)Bore (B)Thickness (T)Length Thru Hub (Y)Approximate Weight (lbs)
1/23.502.380.1240.621.190.900.440.621
3/43.882.750.1240.621.501.110.500.622
14.253.120.1240.621.941.360.560.692
1 1/44.623.500.1940.622.311.700.620.813
1 1/25.003.880.2540.622.561.950.690.883
26.004.750.3140.753.062.440.751.005
2 1/27.005.500.3140.753.562.970.881.127
37.506.000.3840.754.253.600.941.198
3 1/28.507.000.3880.754.814.100.941.2511
49.007.500.4480.755.314.600.941.3113
510.008.500.4480.886.445.690.941.4415
611.009.500.5080.887.566.751.001.5619
813.5011.750.5080.889.698.751.121.7530
1016.0014.250.50121.0012.0010.921.191.9443
1219.0017.000.50121.0014.3812.921.252.1964
1421.0018.750.50121.1215.7514.181.383.12105
1623.5021.250.50161.1218.0016.191.443.44140
1825.0022.750.50161.2519.8818.201.563.81160
2027.5025.000.50201.2522.0020.251.694.06195
2229.5027.250.50201.3824.0022.251.814.25245
2432.0029.500.50201.3826.1224.251.884.38275

ASME/ANSI B16.5 Class 300 Lap Joint Flanges

(a)All dimensions are in inches.

Nominal Pipe SizeOutside Diameter (O)Bolt Circle (W)Radius (r)Number of HolesDiameter of HolesHub Diameter (X)Bore (B)Thickness (T)Length Thru Hub (Y)Approximate Weight (lbs)
1/23.752.620.1240.631.500.900.560.882
3/44.623.250.1240.751.881.110.621.003
14.883.500.1240.752.121.380.691.063
1 1/45.253.880.1940.752.501.720.751.064
1 1/26.124.500.2540.882.751.970.811.196
26.505.000.3180.753.312.460.881.317
2 1/27.505.880.3180.883.942.971.001.5010
38.256.620.3880.884.623.601.121.6913
3 1/29.007.250.3880.885.254.101.191.7517
410.007.880.4480.885.754.601.251.8822
511.009.250.4480.887.005.691.382.0028
612.5010.620.50120.888.126.751.442.0639
815.0013.000.50121.0010.258.751.622.4458
1017.5015.250.50161.1312.6210.921.883.7591
1220.5017.750.50161.2514.7512.922.004.00140
1423.0020.250.50201.2516.7514.182.124.38190
1625.5022.500.50201.3819.0016.192.254.75250
1828.0024.750.50241.3821.0018.202.385.12295
2030.5027.000.50241.3823.1220.252.505.50370
2233.0029.250.50241.6325.2522.252.625.69435
2436.0032.000.50241.6327.6224.252.756.00550

ASME/ANSI B16.5 Class 400 Lap Joint Flanges

(a)All dimensions are in inches.

Nominal Pipe SizeOutside Diameter (O)Bolt Circle (W)Radius (r)Number of HolesDiameter of HolesHub Diameter (X)Bore (B)Thickness (T)Length Thru Hub (Y)Approximate Weight (lbs)
1/23.752.620.1240.631.500.900.560.882
3/44.623.250.1240.751.881.110.621.003
14.883.500.1240.752.121.380.691.064
1 1/45.253.880.1940.752.501.720.811.125
1 1/26.124.500.2540.882.751.970.881.257
26.505.000.3180.753.312.461.001.449
2 1/27.505.880.3180.883.942.971.121.6212
38.256.620.3880.884.623.601.251.8115
3 1/29.007.250.3881.005.254.101.381.9420
410.007.880.4481.005.754.601.382.0025
511.009.250.4481.007.005.691.502.1229
612.5010.620.50121.008.126.751.622.2542
815.0013.000.50121.1310.258.751.882.6964
1017.5015.250.50161.2512.6210.922.124.00110
1220.5017.750.50161.3814.7512.922.254.25150
1423.0020.250.50201.3816.7514.182.384.62205
1625.5022.500.50201.5019.0016.192.505.00260
1828.0024.750.50241.5021.0018.202.625.38315
2030.5027.000.50241.6323.1320.252.755.75385
2233.0029.250.50241.7525.2522.252.886.00455
2436.0032.000.50241.8827.6224.253.006.25570

ASME/ANSI B16.5 Class 600 Lap Joint Flanges

(a)All dimensions are in inches.

Nominal Pipe SizeOutside Diameter (O)Bolt Circle (W)Radius (r)Number of HolesDiameter of HolesHub Diameter (X)Bore (B)Thickness (T)Length Thru Hub (Y)Approximate Weight (lbs)
1/23.752.620.1240.631.500.900.560.882
3/44.623.250.1240.751.881.110.621.003
14.883.500.1240.752.121.380.691.064
1 1/45.253.880.1940.752.501.720.811.125
1 1/26.124.500.2540.882.751.970.881.257
26.505.000.3180.753.312.461.001.449
2 1/27.505.880.3180.883.942.971.121.6212
38.256.620.3880.884.623.601.251.8115
3 1/29.007.250.3881.005.254.101.381.9420
410.758.500.4481.006.004.601.502.1236
513.0010.500.4481.137.445.691.752.3861
614.0011.500.50121.138.756.751.882.6278
816.5013.750.50121.2510.758.752.193.00110
1020.0017.000.50161.3813.5010.922.504.38170
1222.0019.250.50201.3815.7512.922.624.62200
1423.7520.750.50201.5017.0014.182.755.00250
1627.0023.750.50201.6319.5016.193.005.50365
1829.2525.750.50201.7521.5018.203.256.00435
2032.0028.500.50241.7524.0020.253.506.50570
2234.2530.620.50241.8826.2522.253.756.88670
2437.0033.000.50242.0028.2524.254.007.25810

ASME/ANSI B16.5 Class 900 Lap Joint Flanges

(a)All dimensions are in inches.

Nominal Pipe SizeOutside Diameter (O)Bolt Circle (W)Radius (r)Number of HolesDiameter of HolesHub Diameter (X)Bore (B)Thickness (T)Length Thru Hub (Y)Approximate Weight (lbs)
1/24.753.250.1240.881.500.900.881.254
3/45.123.500.1240.881.751.111.001.385
15.884.000.1241.002.061.381.121.628
1 1/46.254.380.1941.002.501.721.121.629
1 1/27.004.880.2541.132.751.971.251.7512
28.506.500.3181.004.122.461.502.2525
2 1/29.627.500.3181.134.882.971.622.5035
39.507.500.3881.005.003.601.502.1225
411.509.250.4481.256.254.601.752.7551
513.7511.000.5081.387.505.692.003.1281
615.0012.500.50121.259.256.752.193.38105
818.5015.500.50121.5011.758.752.504.50190
1021.5018.500.50161.5014.5010.922.755.00275
1224.0021.000.50201.5016.5012.923.125.62370
1425.2522.000.50201.6317.7514.183.386.12415
1627.7524.250.50201.7520.0016.193.506.50465
1831.0027.000.50202.0022.2518.204.007.50650
2033.7529.500.50202.1324.5020.254.258.25810
2441.0035.500.50202.6329.5024.255.5010.501550

ASME/ANSI B16.5 Class 1500 Lap Joint Flanges

(a)All dimensions are in inches.

Nominal Pipe SizeOutside Diameter (O)Bolt Circle (W)Radius (r)Number of HolesDiameter of HolesHub Diameter (X)Bore (B)Thickness (T)Length Thru Hub (Y)Approximate Weight (lbs)
1/24.753.250.1240.881.500.900.881.254
3/45.123.500.1240.881.751.111.001.385
15.884.000.1241.002.061.381.121.628
1 1/46.254.380.1941.002.501.721.121.629
1 1/27.004.880.2541.132.751.971.251.7512
28.506.500.3181.004.122.461.502.2525
2 1/29.627.500.3181.134.882.971.622.5035
310.508.000.3881.255.253.601.882.8847
412.259.500.4481.386.384.602.123.5675
514.7511.500.4481.637.755.692.884.12140
615.5012.500.50121.509.006.753.254.69170
819.0015.500.50121.7511.508.753.625.62285
1023.0019.000.50122.0014.5010.924.257.00485
1226.5022.500.50162.1317.7512.924.888.62630
1429.5025.000.50162.3819.5014.185.259.50890
1632.5027.750.50162.6321.7516.195.7510.251150
1836.0030.500.50162.8823.5018.206.3810.881475
2038.7532.750.50163.1325.2520.257.0011.501775
2446.0039.000.50163.6330.0024.258.0013.002825

ASME/ANSI B16.5 Class 2500 Lap Joint Flanges

(a)All dimensions are in inches.

Nominal Pipe SizeOutside Diameter (O)Bolt Circle (W)Radius (r)Number of HolesDiameter of HolesHub Diameter (X)Bore (B)Thickness (T)Length Thru Hub (Y)Approximate Weight (lbs)
1/25.253.500.1240.881.690.901.191.567
3/45.503.750.1240.882.001.111.251.698
16.254.250.1241.002.251.381.381.8811
1 1/47.255.120.1941.132.881.721.502.0616
1 1/28.005.750.2541.253.121.971.752.3822
29.256.750.3181.133.752.462.002.7537
2 1/210.507.750.3181.254.502.972.253.1253
312.009.000.3881.385.253.602.623.6280
414.0010.750.4481.636.504.603.004.25120
516.5012.750.4481.888.005.693.625.12205
619.0014.500.5082.139.256.754.256.00315
821.7517.250.50122.1312.008.755.007.00470
1026.5021.250.50122.6314.7510.926.509.00900
1230.0024.380.50122.8817.3812.927.2510.001100

Here is a table outlining the specifications and characteristics of ASME/ANSI B16.5 Lap Joint Flanges:

Specification/FeatureDescription
StandardASME/ANSI B16.5 Lap Joint Flange.
TypeLap Joint Flange – A type of flange consisting of two parts: a stub end and a backing flange. The stub end is butt-welded to the pipe, while the backing flange allows easy bolt-on connection.
Pressure RatingsAvailable in different pressure classes, such as 150, 300, 600, 900, 1500, 2500, etc., to accommodate varying pressure requirements.
Size RangeTypically available in sizes ranging from 1/2 inches to 48 inches or larger, suitable for various pipe and equipment sizes.
MaterialsASME/ANSI B16.5 Lap Joint Flanges can be manufactured from materials like carbon steel, stainless steel, alloy steel, and more, chosen based on application requirements.
Facing TypesCommon facing types include Raised Face (RF), Flat Face (FF), Ring-Type Joint (RTJ), and Male and Female (M&F) facings, impacting sealing methods.
Bolt Hole Quantity and DiameterThe number and diameter of bolt holes vary with flange size and pressure rating, facilitating flange connection.
Connection MethodASME/ANSI B16.5 Lap Joint Flanges consist of two parts: a stub end that is butt-welded to the pipe, and a backing flange that is bolted to the stub end, allowing for easy disassembly and alignment.
Application AreasLap Joint Flanges are used in industries where easy alignment and disassembly are required, such as in systems with frequent maintenance needs.
Standards and CodesASME/ANSI B16.5 Lap Joint Flanges adhere to standards set by the American National Standards Institute (ANSI) and nominal pipe size (NPS) standards, such as ANSI B16.5.
Seal TypesLap Joint Flanges commonly use gaskets or O-rings for sealing, with the choice of seal type depending on the application and pressure rating.
Accessories and AttachmentsSome applications may require additional components such as flange gaskets, bolts, nuts, and flange cover gaskets.
Inspection and TestingASME/ANSI B16.5 Lap Joint Flanges typically undergo a series of inspections and tests to ensure they meet quality and performance requirements, in compliance with standards.
Marking and CertificationLap Joint Flanges should be marked with the manufacturer’s identification, size, class, material, and other relevant information. Some flanges may require specific certifications such as PED or ASME.
Installation and MaintenanceProper installation and regular maintenance of Lap Joint Flanges, including weld integrity, bolt torque, flange face cleaning, and seal replacement, are crucial for system integrity and performance.
Application StandardsIn specific industries and applications, there may be industry-specific Lap Joint Flange application standards that need to be adhered to for safety and performance.
ASME/ANSI B16.5 Lap Joint Flanges Main Features and Specifications Table

This table provides a comprehensive overview of ASME/ANSI B16.5 Lap Joint Flanges, covering key specifications, characteristics, and additional considerations. Specific details and requirements may vary based on the chosen flange size, pressure rating, and material.

ASME/ANSI B16.5 Lap Joint Flanges are a type of flange designed to be used in piping systems where frequent dismantling and inspection are required. They are also commonly used in systems where alignment of the piping system is critical, such as in the case of stub end connections.

Lap Joint Flanges consist of two components: the stub end and the backing flange. The stub end is a short, straight length of pipe with a welded-on collar that functions as a sleeve. The backing flange has the same outside diameter as the stub end collar, and the inside diameter matches the inside diameter of the pipeline. The backing flange is used to provide support to the gasket, which sits between the two flanges and helps create a seal.

ASME/ANSI B16.5 Lap Joint Flanges are available in a range of sizes, from 1/2 inch to 60 inches, and are commonly used in low-pressure and low-temperature applications. They are typically used in piping systems for water, air, and steam, among other fluids.

One of the benefits of Lap Joint Flanges is that they allow for easy alignment of the pipeline because the stub end can rotate around the pipe axis, which allows for easy adjustment during installation. Another advantage of Lap Joint Flanges is that they can be easily disassembled for maintenance and inspection without having to cut the pipe or damage the flange.

The ASME/ANSI B16.5 standard sets out the dimensions and tolerances for Lap Joint Flanges, including the outside diameter, bolt circle diameter, bolt hole diameter, and thickness. The standard also sets out the marking requirements and the testing procedures to ensure the quality and performance of the flange.

ASME/ANSI B16.5 Lap Joint Flanges are available in a range of materials, including carbon steel, stainless steel, and alloy steel, among others. The material selection depends on the specific requirements of the application, such as the temperature, pressure, and corrosion resistance of the piping system.

In summary, ASME/ANSI B16.5 Lap Joint Flanges are a type of flange designed for use in piping systems where frequent dismantling and inspection are required. They consist of a stub end and a backing flange and are commonly used in low-pressure and low-temperature applications. Proper selection, installation, and maintenance of ASME/ANSI B16.5 Lap Joint Flanges are crucial to ensure a safe and reliable operation of the piping system.

ASME B16. 5 Lap Joint Flanges are mostly used with stub end fittings. This is usually welded and is free to rotate around the stub end. This consists of various dimensions and it includes factors like nominal size, outside diameter, thickness, and many more.

Freedom to swivel around the pipe facilitates the lining up of opposing flange bolt holes. Lack of contact with the fluid in the pipe often permits the use of inexpensive carbon steel flanges with the corrosion-resistant pipe.

5 are. Welding Neck, Slip On, Socket Weld, Lap Joint, Threaded and Blind flange. Below you will find a short description and definition of each type, complete with a detailed image.

Lap joint flanges are extremely similar to slip-on flanges, with the primary difference being that the bore and face have a curved radius to accommodate a lap joint stub-end. Lap joint flanges and stub-end assemblies are commonly employed in circumstances where regular disassembly for inspection is necessary.

The flanged joint design means that pipes are secured by external screws, providing additional joint support for the transportation of substances at high pressure.

To assemble a lap joint ring flange and stub end, the stub end must slide into the bore of the flange ring and then be butt welded to the pipe. One side of the stub end forms the sealing face, whilst the opposite/back side of the stub end presses against the lap joint flange ring (when the flange is assembled).