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ASME B16.5 Carbon Steel Lap Joint Flanges LJRF Class 1500LB for Industrial Applications
Introduction:
We appreciate your interest in Shaanxi Peter International Trade Co., Ltd, a well-respected and established firm with years of experience in the industry. We take pride in offering a comprehensive range of high-quality ASME B16.5 Class 1500 Lap Joint Flanges.
The Class 1500 lap joint flange, which is also referred to as the Class 1500 loose flange, comprises of two components - the backing flange and the stub end. The stub end is welded to the pipe while the Class 1500 lap joint flange slips over the stub end. This flange does not have a direct connection with the pipe or the stub end, thus permitting rotation. As a result, connecting the flange during installation is extremely convenient, particularly when there is some misalignment between the bolt holes.
Description of ASME B16.5 Class 1500 Carbon Steel Lap Joint Flanges:
ASME B16.5 Class 1500 Carbon Steel Lap Joint Flanges are a specific type of flange designed for high-pressure applications. These flanges are made of carbon steel and conform to the ASME B16.5 standard, which defines the dimensions and tolerances for flanges.
Class 1500 refers to the pressure rating of these flanges, indicating they can withstand higher pressure compared to lower class flanges. The Class 1500 designation means that the flanges are rated for a maximum working pressure of 1500 pounds per square inch (psi).
Carbon steel lap joint flanges consist of two main components: a backing flange and a stub end. The backing flange is bolted to another flange or valve, while the stub end is welded to the pipe. The lap joint flange then slides over the stub end, allowing for rotation during installation.
One notable feature of lap joint flanges is their ability to accommodate misalignment or slight rotation between the flange and the stub end. This makes installation more convenient, especially if there are minor variations in alignment or positioning.
ASME B16.5 Class 1500 Carbon Steel Lap Joint Flanges are commonly used in industries such as oil and gas, chemical processing, power generation, and others where high-pressure piping systems are required. These flanges provide a reliable and secure connection, ensuring the integrity of the pipeline under high-pressure conditions.
ASME B16.5 Lap Joint Flange Dimensions:
| ASME B16.5 Class 1500 Lap Joint FLANGES LJRF | ||||||||||
| Nominal Pipe size | Outside Diam | Diam at Base of Hub | Thickness | Bore | Length | Radius of Fillet | Drilling | Approximate Weight(lb) | ||
| D | X | t | B3 | T3 | R | Bolt circle dia | Number of holes | Dia of Bolt | ||
| 1/2'' | 121 | 38.1 | 22.4 | 22.9 | 31.8 | 3 | 82.6 | 4 | 22.4 | 6 |
| 3/4'' | 130 | 44.5 | 25.4 | 28.2 | 35.1 | 3 | 88.9 | 4 | 22.4 | 6 |
| 1'' | 149 | 52.3 | 28.4 | 35.1 | 41.2 | 3 | 101.6 | 4 | 25.4 | 8 |
| 1.1/4'' | 159 | 63.5 | 28.4 | 43.7 | 41.2 | 4.8 | 111.3 | 4 | 25.4 | 10 |
| 1.1/2'' | 178 | 69.9 | 31.8 | 50 | 44.5 | 6.4 | 124 | 4 | 28.4 | 14 |
| 2'' | 216 | 104.6 | 38.1 | 62.5 | 57.2 | 7.9 | 165.1 | 8 | 25.4 | 25 |
| 2.1/2'' | 244 | 124 | 41.1 | 75.4 | 63.5 | 7.9 | 190.5 | 8 | 28.4 | 35 |
| 3'' | 265 | 133 | 47.7 | 91.4 | 73.2 | 9.7 | 203.2 | 8 | 31.8 | 47 |
| 4'' | 310 | 162 | 54.0 | 116.8 | 90.4 | 11.2 | 241.3 | 8 | 35.1 | 75 |
| 5'' | 375 | 197 | 73.1 | 144.5 | 104.7 | 11.2 | 292.1 | 8 | 41.4 | 140 |
| 6'' | 395 | 229 | 82.6 | 171.5 | 119.1 | 12.7 | 317.5 | 12 | 38.1 | 170 |
| 8'' | 485 | 292 | 92.1 | 222.3 | 142.8 | 12.7 | 393.7 | 12 | 44.5 | 286 |
| 10'' | 585 | 368 | 108.0 | 277.4 | 177.8 | 12.7 | 482.6 | 12 | 50.8 | 485 |
| 12'' | 675 | 451 | 123.9 | 328.2 | 219 | 12.7 | 571.5 | 16 | 53.9 | 749 |
| 14'' | 750 | 495 | 133.4 | 360.2 | 241.3 | 12.7 | 635 | 16 | 60.5 | 890 |
| 16'' | 825 | 552 | 146.1 | 411.2 | 260.4 | 12.7 | 704.9 | 16 | 66.8 | 1250 |
| 18'' | 915 | 597 | 162.0 | 462.3 | 276.4 | 12.7 | 774.7 | 16 | 73.2 | 1475 |
| 20'' | 985 | 641 | 177.8 | 514.4 | 292.1 | 12.7 | 831.9 | 16 | 79.3 | 1775 |
| 24'' | 1170 | 762 | 203.2 | 616 | 330 | 12.7 | 990.6 | 16 | 92.2 | 2825 |
1.Dimensions are in millimeters(mm).
2.Dimensios can be specified by different purchasers.
Features of Lap Joint Flanges in the Applications:
Two-piece design: Lap Joint Flanges consist of two separate pieces, a Stub End and a backing flange. The two-piece design allows for easier alignment of bolt holes during installation and removal.
Rotatable flange: The backing flange of Lap Joint Flanges is not welded to the pipe, making it rotatable. This feature facilitates alignment of bolt holes, simplifying installation and removal processes.
Cost-effective: Lap Joint Flanges are a cost-effective solution that allows the usage of an expensive corrosion-resistant material for only the Stub End, while the backing flange can be made from more affordable materials like carbon steel.
Easy dismantling: The two-piece design of Lap Joint Flanges makes them easy to dismantle, facilitating inspection, maintenance, and repair operations.
Corrosion resistance: Lap Joint Flanges are available in a range of materials that offer excellent corrosion resistance, making them ideal for use in corrosive environments.
Low-pressure applications: Lap Joint Flanges are typically recommended for low-pressure applications, where the loads applied to the flange connection by the pipe are relatively low.
Limited sealing capability: Lap Joint Flanges rely on the gaskets placed between the Stub End and the backing flange to provide a seal. As a result, their sealing capability is limited.
Advantages and Disadvantages of Lap Joint Flanges:
The usage of Lap Joint Flanges offers two significant advantages in their application. Let's consider a piping connection that demands the use of an expensive corrosion-resistant alloy like nickel, zirconium, tantalum, or titanium for all "wetted" parts. In such cases, the Stub End can be fabricated from the costly alloy to resist corrosion, while the Lap Joint Flange, acting as a backing flange, can be made from more affordable carbon steels. This approach proves to be cost-effective compared to using an entirely alloy-based flange.
Furthermore, the Lap Joint Flange, not being welded to the pipe, allows for free rotation to align bolt holes, simplifying assembly and disassembly processes. This feature proves beneficial in piping systems that require frequent dismantling for inspection or routine maintenance. By separating the Lap Joint Flange and Stub End without involving the pipe, accessing the joint becomes easier, reducing downtime during maintenance operations.
In summary, Lap Joint Flanges offer a practical and cost-effective solution for piping systems that necessitate corrosion-resistant materials, while also providing ease of maintenance and inspection.
The use of Lap Joint Flanges is associated with certain disadvantages. One key issue is the formation of crevices between the internal surface of the flange bore and the external surface of the stub ends, which can easily collect contaminants and lead to crevice corrosion. This poses a significant challenge for maintaining the joint's integrity and longevity.
Moreover, the accumulation of longitudinal stresses due to pressure, weight, and thermal expansion can exceed the allowable stress limits prescribed by ASME B31.3 at the design temperature. Therefore, Lap Joint Flanges are typically recommended for mild service applications where the loads applied to the flange connection by the pipe are relatively low.
Another potential problem is the occurrence of galvanic corrosion when using Lap Joint Flanges made from different materials than the stub ends. This happens when two dissimilar metals come into contact in the presence of an electrolyte, causing accelerated corrosion.
To overcome these issues, careful consideration must be given to material selection while implementing Lap Joint Flanges in a piping system. Appropriate maintenance and inspection practices should also be employed to mitigate these concerns and ensure optimal performance of the joint.
Applications of ASME B16.5 Carbon Steel Lap Joint Flanges:
ASME B16.5 carbon steel lap joint flanges find applications in various industries and piping systems where carbon steel materials are suitable. Some common applications include:
Oil and gas industry: Carbon steel lap joint flanges are widely used in oil and gas exploration, production, refining, and transportation. They can be found in pipelines, offshore platforms, refineries, and petrochemical plants.
Power generation: Lap joint flanges are utilized in power plants, including thermal power plants, nuclear power plants, and renewable energy facilities. They are used in piping systems for steam, water, and fuel transportation.
Chemical processing: Lap joint flanges are suitable for chemical processing plants where corrosion resistance and durability are essential. They are commonly used in pipelines that transport chemicals, acids, and corrosive fluids.
Water and wastewater treatment: Carbon steel lap joint flanges are utilized in water treatment plants, wastewater treatment facilities, and desalination plants. They are employed in piping systems for water supply, sewage transport, and treatment processes.
HVAC (Heating, Ventilation, and Air Conditioning): Lap joint flanges are used in HVAC systems for commercial buildings, industrial facilities, and residential complexes. They enable the connection of ductwork, pipes, and ventilation systems.
Mining and mineral processing: Carbon steel lap joint flanges are employed in mining operations and mineral processing plants. They are utilized in pipelines for the transportation of ores, slurries, and other mining fluids.
Overall, ASME B16.5 carbon steel lap joint flanges are versatile components that play a crucial role in creating secure terminations, facilitating maintenance, and ensuring the integrity of piping systems across a wide range of industrial applications.
