What is Loose Flange(Lap Joint Flange)?
The connection of loose flange (Lap Joint Flange) is actually achieved by welding.
The difference is this type flange not welded with pipe directly, it uses the auxiliary component(such as stub end) welded with the pipe instead, and then the auxiliary component and the gasket are compressed by a connecting bolt. And the flange(Loose Flange) itself does not connect with the medium.
Flat welding and butt welding both available.
Advantage:
1. Saving total cost. When the pipe material is special and expensive, welding the same material of the flange is expensive. You can choose the loose flange. (Flange could be a different material, only need auxiliary component material is the same as pipe material).
2. This flange could be rotated to easily align the bolt holes, and it is easy to install on large diameter pipes.
3.Suitable for places where pipes need to be disassembled frequently for cleaning or inspection. Or if you want to align the flange bolt hole, it only needs to turn the flange without rotating the pipe.
Disadvantage:
1. Withstand low pressure.
2. The strength at the welding ring is low (especially when the thickness is less than 3mm)
ANSI B16.5 150LB Lap Joint Flange
Main Size: Unit: mm
| Size | Pipe OD A | OD | Bolt Circle | Bolt Hole | Sealing Face | Thickness | ID | H | T | ||
| Inch | DN | BC | B | R | RF | T1 | |||||
| 1/2" | 15 | 21.3 | 90 | 60.5 | 16x4 | 35 | 1.6 | 9.9 | 15.5 | 30 | 48 |
| 3/4" | 20 | 26.9 | 100 | 70 | 16x4 | 43 | 1.6 | 11.4 | 21 | 38 | 52 |
| 1" | 25 | 33.7 | 110 | 79.5 | 16x4 | 51 | 1.6 | 12.9 | 27 | 49 | 56 |
| 1-1/4" | 32 | 42.4 | 115 | 89 | 16x4 | 63.5 | 1.6 | 14.4 | 35 | 59 | 57 |
| 1-1/2" | 40 | 48.3 | 125 | 98.5 | 16x4 | 73 | 1.6 | 15.9 | 41 | 65 | 62 |
| 2" | 50 | 60.3 | 150 | 120.5 | 18x4 | 92 | 1.6 | 17.9 | 52 | 78 | 64 |
| 2-1/2" | 65 | 76.1 | 180 | 139.5 | 18x4 | 105 | 1.6 | 20.9 | 66 | 90 | 70 |
| 3" | 80 | 88.9 | 190 | 152.5 | 18x4 | 127 | 1.6 | 22.4 | 77.5 | 108 | 70 |
| 4" | 100 | 114.3 | 230 | 190.5 | 18x8 | 157.5 | 1.6 | 22.4 | 101.5 | 135 | 76 |
| 5" | 125 | 139.7 | 255 | 216 | 22x8 | 186 | 1.6 | 22.4 | 127 | 164 | 89 |
| 6" | 150 | 168.3 | 280 | 241.5 | 22x8 | 216 | 1.6 | 23.9 | 154 | 192 | 89 |
| 8" | 200 | 219.1 | 345 | 298.5 | 22x8 | 270 | 1.6 | 27.4 | 203 | 246 | 102 |
| 10" | 250 | 273 | 405 | 362 | 26x12 | 324 | 1.6 | 28.9 | 255 | 305 | 102 |
| 12" | 300 | 323.9 | 485 | 432 | 26x12 | 381 | 1.6 | 30.4 | 303.5 | 365 | 114 |
| 14" | 350 | 355.6 | 535 | 476 | 29.5x12 | 413 | 1.6 | 33.4 | 333.5 | 400 | 127 |
| 16" | 400 | 406.4 | 595 | 540 | 29.5x16 | 470 | 1.6 | 35.4 | 381 | 457 | 127 |
| 18" | 450 | 457 | 635 | 578 | 32.5x16 | 533.5 | 1.6 | 38.4 | 428.5 | 505 | 140 |
| 20" | 500 | 508 | 700 | 635 | 32.5x20 | 584 | 1.6 | 41.4 | 476 | 559 | 145 |
| 22" | 550 | 559 | 750 | 692 | 35.5x20 | 641 | 1.6 | 44.4 | 525 | 610 | 149 |
| 24" | 600 | 610 | 815 | 749.5 | 35.5x20 | 692 | 1.6 | 46.4 | 575 | 664 | 152 |
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