Lap Joint Flange Manufacturer
- Suitable for frequent disassembly and maintenance.
- Flanges can be reused.
- Adapt to different material combinations.
High Quality Lap Joint Flange
SSM’s Lap Joint flange is suitable for pipeline systems that require frequent maintenance due to its easy installation and disassembly. Its combination with the nipple design makes it an ideal choice for some low-pressure, non-critical applications.
SSM offers a variety of lap joint flanges covering different sizes, pressure ratings, connection surface types, and materials to meet the needs of various customers.
- Size: 1/2″ to 48″
- Pressure Rating: Class 150, 300, 600, 900, 1500, 2500
- Joint Type: Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
- Material: Carbon steel, stainless steel, nickel alloy, duplex stainless steel, aluminum, copper-nickel alloy
What is a Lap Joint Flange
A lap joint flange is a specially designed pipe flange usually used with a stub end. Its unique design allows the flange to rotate freely on the pipe, making it easier to align the bolt holes during installation. A lap joint flange is suitable for pipe systems that require frequent disassembly and maintenance.
Socket Weld Flange Cross Section
Advantages of Lap Joint Flanges
Easy installation
Lap Joint flanges can rotate freely on the pipe, allowing for easy alignment of bolt holes during installation, making them suitable for pipe systems that are difficult to align.
Easy maintenance
Since Lap Joint flanges are not directly welded to the pipe, they are simple to disassemble and reinstall, making them suitable for pipe systems that require frequent maintenance, cleaning, or replacement.
Compatibility with different materials
Lap Joint flanges can accommodate different material combinations, allowing for the use of cheaper flange materials and expensive materials for short sections (Stub Ends), thus reducing overall costs.
High flexibility
Lap Joint flanges provide a high degree of flexibility during installation, especially in complex pipe systems where the flange position needs to be adjusted.
Lap Joint Flange Dimensions
Below are the dimensions for a Class 300 Lap Joint Flange
| NPS (Nominal Pipe Size) | OD (Outer Diameter) | T (Thickness) | ID (Inner Diameter) | Number of Bolt Holes | Bolt Hole Diameter | Bolt Circle Diameter |
| mm / in | mm / in | mm / in | mm / in | mm / in | ||
| 1/2″ | 95 / 3.75 | 16 / 0.63 | 21.3 / 0.84 | 4 | 16 / 0.63 | 66.7 / 2.63 |
| 3/4″ | 117 / 4.63 | 19 / 0.75 | 26.7 / 1.05 | 4 | 16 / 0.63 | 82.6 / 3.25 |
| 1″ | 124 / 4.88 | 21 / 0.81 | 33.4 / 1.32 | 4 | 16 / 0.63 | 88.9 / 3.50 |
| 1 1/4″ | 133 / 5.25 | 22 / 0.88 | 42.2 / 1.66 | 4 | 16 / 0.63 | 98.4 / 3.88 |
| 1 1/2″ | 156 / 6.13 | 22 / 0.88 | 48.3 / 1.90 | 4 | 20 / 0.75 | 114.3 / 4.50 |
| 2″ | 165 / 6.50 | 23 / 0.91 | 60.3 / 2.38 | 8 | 20 / 0.75 | 127 / 5.00 |
| 2 1/2″ | 191 / 7.50 | 26 / 1.00 | 73 / 2.88 | 8 | 20 / 0.75 | 149.2 / 5.88 |
| 3″ | 210 / 8.25 | 29 / 1.13 | 88.9 / 3.50 | 8 | 22 / 0.88 | 168.3 / 6.63 |
| 4″ | 254 / 10.00 | 32 / 1.25 | 114.3 / 4.50 | 8 | 22 / 0.88 | 200 / 7.88 |
| 5″ | 279 / 11.00 | 35 / 1.38 | 141.3 / 5.56 | 8 | 22 / 0.88 | 235 / 9.25 |
| 6″ | 318 / 12.50 | 37 / 1.44 | 168.3 / 6.63 | 12 | 22 / 0.88 | 269.9 / 10.63 |
| 8″ | 381 / 15.00 | 41 / 1.63 | 219.1 / 8.63 | 12 | 25 / 0.98 | 330.2 / 13.00 |
| 10″ | 445 / 17.50 | 44 / 1.75 | 273 / 10.75 | 16 | 29 / 1.13 | 387.4 / 15.25 |
| 12″ | 521 / 20.50 | 48 / 1.88 | 323.9 / 12.75 | 16 | 32 / 1.25 | 450.9 / 17.75 |
| 14″ | 584 / 23.00 | 51 / 2.00 | 355.6 / 14.00 | 20 | 32 / 1.25 | 514.4 / 20.25 |
| 16″ | 648 / 25.50 | 54 / 2.13 | 406.4 / 16.00 | 20 | 35 / 1.38 | 571.5 / 22.50 |
| 18″ | 711 / 28.00 | 57 / 2.25 | 457.2 / 18.00 | 24 | 35 / 1.38 | 628.7 / 24.75 |
| 20″ | 775 / 30.50 | 60 / 2.38 | 508 / 20.00 | 24 | 35 / 1.38 | 685.8 / 27.00 |
| 24″ | 914 / 36.00 | 67 / 2.63 | 609.6 / 24.00 | 24 | 41 / 1.63 | 812.8 / 32.00 |
Note: Dimensions can vary slightly based on manufacturer specifications, so always consult the specific standards or manufacturer data for precise measurements.
One-Stop Flange Provider for All Your Needs
SSM has significant product advantages in manufacturing Lap Joint flanges. Whether it’s quality or price, we will meet your needs.
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Additional information on Lap Joint Flange
Socket weld flange is one of the most commonly used flanges. Please continue reading for information on flange size, installation, and more.
Installation Process of Lap Joint Flange
Installing a Lap Joint flange involves the following steps:
Step 1: Prepare materials and tools
– Make sure you have all the necessary materials such as Lap Joint flanges, stub ends, bolts, nuts, gaskets, etc.
– Prepare the required tools including wrenches, bolt torque wrenches, etc.
Step 2: Install the stub end
– Weld one end of the stub end to the end of the pipe after ensuring that the ends are clean and free of oil and impurities.
– Check the weld to ensure it is firm and free of defects.
Step 3: Place the Lap Joint flange
– Slide the Lap Joint flange onto the pipe before welding the stub end. It should fit over the outside of the stub end and can be freely rotated and adjusted after welding.
Step 4: Align the bolt holes
– Rotate the Lap Joint flange until the bolt holes are aligned with the bolt holes of the mating flange. This step is usually straightforward because the flange can rotate freely.
Step 5: Install gaskets
– Place suitable gaskets between the two flanges and position them in the center to ensure a good sealing effect.
Step 6: Tighten bolts and nuts
– Insert the bolts into the holes and install the nuts individually. Tighten the nuts step by step to ensure uniform pressure between the flanges.
– Use a torque wrench to tighten the bolts according to the recommended torque value. It’s recommended to tighten them in a diagonal order to ensure uniform force and good sealing of the flanges.
Step 7: Check installation
– After tightening, check the sealing and stability of the flange connection. Ensure there is no leakage, the flange is in the correct position, and the bolts and nuts are properly tightened.
Step 8: System test
– Perform a pressure or leakage test before putting the system into operation to ensure the reliability and sealing of the flange connection.
Following these steps will ensure that the Lap Joint flange is installed correctly and the system’s sealing and stability are guaranteed. The flange’s special design provides a high degree of flexibility and convenience during installation.
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FAQ
Lap Joint Flanges are available in various sizes and pressure classes, with dimensions typically defined by standards such as ANSI, ASME, or DIN. The dimensions include outer diameter, inner diameter, bolt circle diameter, and the number of bolt holes.
Lap Joint Flanges can be made from various materials, including carbon steel, stainless steel, and nickel alloys, depending on the requirements of the application and the environment in which they are used.
Compared to Weld Neck or Slip-On Flanges, Lap Joint Flanges offer more flexibility in bolt alignment and are easier to install and remove. However, they are generally not used in high-pressure or high-stress applications due to their lower strength.
Yes, Lap Joint Flanges are typically not recommended for high-pressure applications, as the design does not provide as much strength as Weld Neck Flanges. They are also not suitable for applications where the flange must be welded to the pipe.