ANSI B16.5 Class 300 Flanges | Lap Joint
ANSI B16.5 Class 300 Lap Joint Flanges conform to the pressure class of 300 pounds-force per square inch (PSIG) as specified by the ANSI (American National Standards Institute) standards. These flanges consist of two stub ends and backing flange, typically used to connect different sections of pipe. Lap joint flanges possess excellent resistance to heat and corrosion. Compared to other types of flanges, they have a lower pressure rating and are therefore not suitable for high-pressure applications that require a tight seal.
YANHAO ANSI B16.5 lap joint flanges are made of stainless steel, carbon steel, and alloy steel. We also provide additional components such as gasket flanges, bolts, nuts, flange covers, or flange cover gaskets. We usually offer standard flanges; if you need to order special types of flanges, please get in touch with our experts.
ANSI B16.5 Class 300(Lap Joint) dimensions
| Nominal Pipe Size | Outside Diameter (O) | Bolt Circle (W) | Radius (r) | Number of Holes | Diameter of Holes | Hub Diameter (X) | Bore (B) | Thickness (T) | Length Thru Hub (Y) | Approximate Weight (lbs) |
|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 3.75 | 2.62 | 0.12 | 4 | 0.63 | 1.50 | 0.90 | 0.56 | 0.88 | 2 |
| 3/4 | 4.62 | 3.25 | 0.12 | 4 | 0.75 | 1.88 | 1.11 | 0.62 | 1.00 | 3 |
| 1 | 4.88 | 3.50 | 0.12 | 4 | 0.75 | 2.12 | 1.38 | 0.69 | 1.06 | 3 |
| 1 1/4 | 5.25 | 3.88 | 0.19 | 4 | 0.75 | 2.50 | 1.72 | 0.75 | 1.06 | 4 |
| 1 1/2 | 6.12 | 4.50 | 0.25 | 4 | 0.88 | 2.75 | 1.97 | 0.81 | 1.19 | 6 |
| 2 | 6.50 | 5.00 | 0.31 | 8 | 0.75 | 3.31 | 2.46 | 0.88 | 1.31 | 7 |
| 2 1/2 | 7.50 | 5.88 | 0.31 | 8 | 0.88 | 3.94 | 2.97 | 1.00 | 1.50 | 10 |
| 3 | 8.25 | 6.62 | 0.38 | 8 | 0.88 | 4.62 | 3.60 | 1.12 | 1.69 | 13 |
| 3 1/2 | 9.00 | 7.25 | 0.38 | 8 | 0.88 | 5.25 | 4.10 | 1.19 | 1.75 | 17 |
| 4 | 10.00 | 7.88 | 0.44 | 8 | 0.88 | 5.75 | 4.60 | 1.25 | 1.88 | 22 |
| 5 | 11.00 | 9.25 | 0.44 | 8 | 0.88 | 7.00 | 5.69 | 1.38 | 2.00 | 28 |
| 6 | 12.50 | 10.62 | 0.50 | 12 | 0.88 | 8.12 | 6.75 | 1.44 | 2.06 | 39 |
| 8 | 15.00 | 13.00 | 0.50 | 12 | 1.00 | 10.25 | 8.75 | 1.62 | 2.44 | 58 |
| 10 | 17.50 | 15.25 | 0.50 | 16 | 1.13 | 12.62 | 10.92 | 1.88 | 3.75 | 91 |
| 12 | 20.50 | 17.75 | 0.50 | 16 | 1.25 | 14.75 | 12.92 | 2.00 | 4.00 | 140 |
| 14 | 23.00 | 20.25 | 0.50 | 20 | 1.25 | 16.75 | 14.18 | 2.12 | 4.38 | 190 |
| 16 | 25.50 | 22.50 | 0.50 | 20 | 1.38 | 19.00 | 16.19 | 2.25 | 4.75 | 250 |
| 18 | 28.00 | 24.75 | 0.50 | 24 | 1.38 | 21.00 | 18.20 | 2.38 | 5.12 | 295 |
| 20 | 30.50 | 27.00 | 0.50 | 24 | 1.38 | 23.12 | 20.25 | 2.50 | 5.50 | 370 |
| 22 | 33.00 | 29.25 | 0.50 | 24 | 1.63 | 25.25 | 22.25 | 2.62 | 5.69 | 435 |
| 24 | 36.00 | 32.00 | 0.50 | 24 | 1.63 | 27.62 | 24.25 | 2.75 | 6.00 | 550 |
Lap Joint
Lap Joint Flanges are specially designed pipe connection components, consisting of two main parts: the stub end and the backing flange. One end of the stub end is welded to the pipeline, while the backing flange is bolted to the other end, and the two work together to achieve rapid connection and sealing of the pipeline.
Lap Joint Flanges are easy to install and remove, structural design can reduce the impact of thermal expansion and contraction on the pipeline. In addition, due to the separate design of the stub end and the backing flange, different materials can be selected according to different working conditions to adapt to various corrosive environments. They are commonly used in oil and gas transportation pipelines, as well as in the chemical industry pipeline systems for handling high-temperature and corrosive media.
