ANSI/ASME B16.5 class 300 lap joint flange
ANSI/ASME B16.5 standard covers pressure,temperature,ratings,materials,dimensions,tolerances,marking, testing,and methods of designating openings for pipe flanges and flanged fittings.Lap joint flange dimensions are covered in ANSI/ASME B16.5 class 300 for size NPS ½” to 24″.
A lap joint flange(loose flange) consist two parts,the backing flange and the stud end,the stub end will be butt welded to the pipe,and the lap joint flange will be slip around the stub end.The lap joint flange is not connected to the pipe and stub end directly,so it could be rotated,it is convenient to install the flange connection if there is some misalignment between the bolt holes.
Dimensions of ANSI/ASME B16.5 class 300 lap joint flange:
ANSI ASME B16.5 Class 300 Lap Joint Flange Dimensions
| Pipe | Flange Data | Lap | Hub | Drilling Data | Weight | ||||||
| Nominal Pipe Size | A | B | C | D | R | F | H | I | J | ||
| Outside Diameter | Overall Diameter | Inside Diameter | Flange Thickness min | Overall Length | Lap Radius | Hub Diameter | Number of Holes | Bolt Hole Diameter | Diameter of Circle of Holes | kg/piece | |
| in mm |
in mm |
in mm |
in mm |
in mm |
in mm |
in mm |
in mm |
in mm |
|||
| ½ | 0.840 21.30 | 3.750 95.20 | 0.900 22.90 | 0.560 14.20 | 0.880 22.30 | 0.120 3.000 | 1.500 38.10 | 4 | 0.620 15.70 | 2.620 66.55 | 0.62 |
| ¾ | 1.050 26.70 | 4.620 117.3 | 1.110 28.20 | 0.620 15.70 | 1.000 25.40 | 0.120 3.000 | 1.880 47.70 | 4 | 0.750 19.00 | 3.250 82.50 | 1.10 |
| 1 | 1.315 33.40 | 4.880 123.9 | 1.380 35.10 | 0.690 17.50 | 1.060 26.90 | 0.120 3.000 | 2.120 53.80 | 4 | 0.750 19.0 | 3.500 88.90 | 1.33 |
| 1¼ | 1.660 42.20 | 5.250 133.3 | 1.720 43.70 | 0.750 19.00 | 1.060 26.90 | 0.190 4.800 | 2.500 63.50 | 4 | 0.750 19.00 | 3.880 98.50 | 1.65 |
| 1½ | 1.900 48.30 | 6.120 155.4 | 1.970 50.00 | 0.810 20.60 | 1.190 30.20 | 0.250 6.400 | 2.750 69.85 | 4 | 0.880 22.30 | 4.500 114.3 | 2.44 |
| 2 | 2.375 60.30 | 6.500 165.1 | 2.460 62.50 | 0.880 22.30 | 1.310 33.20 | 0.310 7.900 | 3.310 84.00 | 8 | 0.750 19.10 | 5.000 127.0 | 2.83 |
| 2½ | 2.875 73.00 | 7.500 190.5 | 2.970 75.40 | 1.000 25.40 | 1.500 38.10 | 0.310 7.900 | 3.940 100.0 | 8 | 0.880 22.30 | 5.880 149.3 | 4.25 |
| 3 | 3.500 88.90 | 8.250 209.5 | 3.600 91.40 | 1.120 28.40 | 1.690 42.90 | 0.380 9.700 | 4.620 117.3 | 8 | 0.880 22.30 | 6.620 168.1 | 5.78 |
| 3½ | 4.000 101.6 | 9.000 228.6 | 4.100 104.1 | 1.190 30.20 | 1.750 44.40 | 0.380 9.700 | 5.250 133.3 | 8 | 0.880 22.30 | 7.250 184.1 | 7.27 |
| 4 | 4.500 114.3 | 10.00 254.0 | 4.600 116.8 | 1.250 31.70 | 1.880 47.70 | 0.440 11.20 | 5.750 146.0 | 8 | 0.880 22.30 | 7.880 200.1 | 9.55 |
| 5 | 5.563 141.3 | 11.00 279.4 | 5.690 114.5 | 1.380 35.00 | 2.000 50.80 | 0.440 11.20 | 7.000 177.8 | 8 | 0.880 22.30 | 9.250 234.9 | 12.2 |
| 6 | 6.625 168.3 | 12.50 317.5 | 6.750 171.5 | 1.440 36.50 | 2.060 52.30 | 0.500 12.70 | 8.120 206.2 | 12 | 0.880 22.30 | 10.62 269.7 | 15.5 |
| 8 | 8.625 219.1 | 15.00 381.0 | 8.750 222.3 | 1.620 41.10 | 2.440 61.90 | 0.500 12.70 | 10.25 260.3 | 12 | 1.000 25.40 | 13.00 330.2 | 24.1 |
| 10 | 10.75 273.0 | 17.50 444.5 | 10.92 277.4 | 1.880 47.70 | 3.750 95.20 | 0.500 12.70 | 12.62 320.5 | 16 | 1.120 28.40 | 15.25 387.3 | 34.4 |
| 12 | 12.75 323.8 | 20.50 520.7 | 12.92 328.2 | 2.000 50.80 | 4.000 101.6 | 0.500 12.70 | 14.75 374.6 | 16 | 1.250 31.70 | 17.75 450.8 | 50.4 |
| 14 | 14.00 355.6 | 23.00 584.2 | 14.18 360.2 | 2.120 53.80 | 4.380 111.2 | 0.500 12.70 | 16.75 425.4 | 20 | 1.250 31.70 | 20.25 514.3 | 70.9 |
| 16 | 16.00 406.4 | 25.50 647.7 | 16.19 411.2 | 2.250 57.15 | 4.750 120.6 | 0.500 12.70 | 19.00 482.6 | 20 | 1.380 35.00 | 22.50 571.5 | 89.5 |
| 18 | 18.00 457.2 | 28.00 711.2 | 18.20 462.3 | 2.380 60.45 | 5.120 130.0 | 0.500 12.70 | 21.00 533.4 | 24 | 1.380 35.00 | 24.75 628.6 | 111 |
| 20 | 20.00 508.0 | 30.50 774.7 | 20.25 514.4 | 2.500 63.50 | 5.500 139.7 | 0.500 12.70 | 23.12 587.2 | 24 | 1.380 35.0 | 27.00 685.8 | 137 |
| 24 | 24.00 609.6 | 36.00 914.4 | 24.25 616.0 | 2.750 69.8 | 6.000 152.4 | 0.500 12.70 | 27.62 701.5 | 24 | 1.620 41.10 | 32.00 812.8 | 204 |
Notes: Weights are based on manufacturer’s data and are approximate.
Specifications of ANSI/ASME B16.5 flange:
Types of ANSI/ASME B16.5 forged flanges:
 ANSI ASME B16.5 weld neck flange drawing |
Weld neck flange(WN flange) is circumferentially welded into the system at its neck which means that the integrity of the butt welded area can be easily examined by radiography.The bores of both pipe and flange match,which reduces turbulence and erosion inside the pipeline.The weld neck is therefore favoured in critical applications. |
 ANSI ASME B16.5 blind flange drawing |
Blind flange is used to blank off pipelines,valves and pumps,it can also be used as an inspection cover.It is sometimes referred to as a blank flange. |
 ANSI ASME B16.5 slip on flange drawing |
Slip on flange(SO flange) is slipped over the pipe and then fillet welded.Slip-on flanges are easy to use in fabricated applications. |
 ANSI ASME B16.5 lap joint flange drawing |
Lap joint flange(LJ flange) is always used with either a stub end or taft which is butt welded to the pipe with the flange loose behind it.This means the stub end or taft always makes the face.The lap joint is favoured in low pressure applications because it is easily assembled and aligned.To reduce cost these flanges can be supplied without a hub and/or in treated,coated carbon steel. |
 ANSI ASME B16.5 socket weld flange drawing |
Socket weld flange(SW flange) is counter bored to accept the pipe before being fillet welded.The bore of the pipe and flange are both the same therefore giving good flow characteristics. |
 ANSI ASME B16.5 threaded flange drawing |
Threaded flange is referred to as either threaded or screwed.It is used to connect other threaded components in low pressure,non-critical applications.No welding is required. |
 ANSI ASME B16.5 ring type joint flange drawing |
Ring type joint is a method of ensuring leak proof flange connection at high pressures.A metal ring is compressed into a hexagonal groove on the face of the flange to make the seal.This jointing method can be employed on weld neck flanges,slip on flange and blind flanges. |
Materials of ANSI/ASME B16.5 class 300 lap joint flange:
Carbon steel ANSI/ASME B16.5 lap joint flange:
ASTM A105,A350 LF2,SS400,P235GH,P250GH,C22.8,Q235,20#,16Mn,etc.
Stainless steel ANSI/ASME B16.5 lap joint flange:
ASTM A182 F304,F304L,F316,F316L,F321,F347,F310,F44,F51,etc.
Alloy steel ANSI/ASME B16.5 lap joint flange:
ASTM A694 F42,F46,F52,F56,F60,F65,F70,A182 F5,F9,F91,F12,F11,F22,etc.
Related:
- ANSI/ASME B16.5 class 150 lap joint flange
- ANSI/ASME B16.5 class 300 lap joint flange
- ANSI/ASME B16.5 class 400 lap joint flange
- ANSI/ASME B16.5 class 600 lap joint flange
- ANSI/ASME B16.5 class 900 lap joint flange
- ANSI/ASME B16.5 class 1500 lap joint flange
- ANSI/ASME B16.5 class 2500 lap joint flange
Haihao Group is one of the the biggest flanges manufacturer & supplier & exporter in China,we has strong experience in flange production and inspection and a complete set of equipments,including advanced cutting,forging,machining,drilling machines and professional testing & inspection instruments.If you want to know more about our forged flanges,please email us:sales@haihaogroup.com
