Lapped Joint Flange
A lapped joint flange is a type of flange connection where the stub end or lap joint is attached to the flange, allowing easy assembly and disassembly of the joint. This flange consists of two separate components: the stub end and the backing flange. The stub end is welded to the pipe, while the backing flange, which typically features a raised face with bolt holes, is used to bolt the joint to another flange or equipment. Lapped flanges are commonly employed in applications where frequent dismantling or maintenance is required, as they facilitate quick and hassle-free disconnection without the need for cutting or welding the pipe. If you are interested in our lap flanges, please contact us.
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- Flange Manufacturer
- Flange standard
- Welding Neck Flange
- Stainless steel Flange
- Carbon & Alloy steel Flange
- Blind Flange
- Lap Joint Flange
- Orifice Flange
- Threaded Flange
- Swivel Ring Flange
- Reducing Flange
- Slip-On Flange
- Spectacle Blind Flange
- Compact Flange
- 1/2" (24)
- 3/4" (24)
- 1" (24)
- 1-1/4" (24)
- 1-1/2" (24)
- 2" (25)
- 2-1/2" (24)
- 3" (24)
- 4" (20)
- 4" (20)
- 304L (179)
- 316L (179)
Lapped Joint Flange Models
Lap Joint Pipe Assembly And Disassembly
1. Weld the stub end to the pipe according to the appropriate welding procedure. Ensure that the weld is strong and free from defects to provide a secure connection;
2. Slide the stub end into the bore of the backing flange until it reaches the desired position. The end of the stub should protrude slightly beyond the face of the flange lap;
3. Align the stub end and lap flange joint to ensure that they are concentric and properly positioned. This step is crucial for creating a leak-tight seal and preventing misalignment issues;
4. Place the gasket between the faces of the stub end and lap joint pipe flange to provide a seal. Insert bolts through the bolt holes in the lap joint fitting and align them with the corresponding holes in the stub end;
5. Gradually tighten the bolts in a crisscross pattern using a torque wrench to ensure even distribution of pressure.
1. Using a wrench, gradually loosen the bolts in a crisscross pattern to release the pressure on the joint. Be careful not to remove the bolts completely until all bolts have been loosened to avoid uneven stress on the joint;
2. Once all bolts are loosened, remove them from the bolt holes in the lap joint fitting;
3. Carefully separate the lapped joint flange from the stub end by pulling them apart. If necessary, use a pry bar or similar tool to gently pry them apart;
4. Inspect the stub end, lapped flange, and gasket for any signs of damage, wear, or corrosion. Replace any components that show signs of deterioration to ensure the integrity of the joint;
5. Clean the stub end and lap joint flange to remove any residue or debris that could affect the performance of the joint during reassembly
Design And Structure Of Lapped Joint Flange
Stub End
The stub end is a cylindrical piece with a tapered or straight end that is welded to the pipe. It typically has a short length compared to other flange types. The end of the stub is either lap jointed or buttwelded to the pipe, providing a smooth transition and connection. This component acts as a loose collar allowing the assembly to swivel for alignment during installation.
Lapped Flange
The lapped flange, is a flat plate with bolt holes around the perimeter and a raised face. It is designed to fit over the stub end and provide the bolting surface for connecting to another flange or equipment. The raised face helps create a seal when tightened against a matching flange, such as a weld neck or slip-on flange.
Lap Flange Applications
Stub end and lap joint flanges are employed in piping systems for transporting corrosive chemicals and fluids. Their corrosion resistance and ease of maintenance make them suitable for environments where chemical compatibility is essential.
In water treatment facilities, lap joint pipes are utilized for conveying treated water, wastewater, and chemicals. Their ability to handle varying water qualities and ease of disassembly facilitate efficient maintenance and repairs
Flanges lap are found in pipelines, offshore platforms, refineries, and petrochemical plants. They enable quick disassembly for maintenance and modifications in environments with high-pressure and high-temperature conditions.
Lap flanges joint are used in ductwork connections in heating, ventilation, and air conditioning systems. Their ease of installation and alignment flexibility make them suitable for maintaining airflow and temperature control in buildings.
Lap joint pipe flanges are employed in food processing plants for conveying food products, beverages, and ingredients. Their sanitary design and ease of cleaning ensure compliance with hygiene standards and facilitate regular maintenance.
Lap joint fittings find applications in power plants for transporting steam, water, and other fluids used in power generation processes. Their ability to accommodate thermal expansion and contraction is crucial in high-temperature applications.
Lap Joint Flange Types
Stainless Steel Lap Joint Flange
Stainless lap joint flanges retain the inherent properties of stainless steel, including high strength, durability, and resistance to high temperatures. They are available in various stainless steel grades, such as F304, F304L, F316, F316L, 316Ti, each offering specific properties suitable for different applications and environments.
Carbon Steel Lap Joint Flange
Carbon steel lap joint flanges are known for their robustness and resistance to mechanical stress, making them suitable for high-pressure and high-temperature applications. They are typically manufactured in various grades of carbon steel, such as A105, SS400, SF440 RST37.2, S235JRG2, P250GH, C22.8. Choosing the suitable grade depends on factors such as the operating conditions, temperature, and pressure requirements of the application.
Copper Lap Joint Flange
Copper lap joint flanges are often employed in applications such as plumbing, refrigeration, HVAC systems, and water distribution networks. They are particularly favored in installations where copper piping is prevalent, ensuring compatibility and uniformity in the system.
Lap Joint Pipe Flange Standards
Our lapped joint flanges are typically designed to conform to industry standards, such as lap JIS, ANSI, DIN, BS4504, SABS1123, EN1092-1, UNI, AS2129, GOST-12820.
Lapped Flange Sizes And Pressure Ratings
Our lap flanges are available in DN15-DN2000 and pressure ratings are ANSI class 150, 300, 600, 1500, 2500, DIN PN6, PN10, PN16, PN25, PN40, PN64, PN100, PN160.
Advantages Of Stub End And Lap Joint Flange
One of the primary advantages is their flexibility in alignment. The stub end can swivel within the lap joint pipe, allowing for easy alignment of the piping system during installation. This flexibility helps compensate for minor misalignments, reducing the risk of leaks and ensuring a tight seal.
Stub end and flange lap assemblies are designed for easy assembly and disassembly. Unlike welded flange connections, they can be quickly disconnected without disturbing the entire piping system. This feature facilitates maintenance, repairs, and modifications, reducing downtime and labor costs.
Lap flanges joint assemblies can be more cost-effective compared to other types of flange connections. Since only the stub end needs to be welded to the pipe, less welding labor and material are required, resulting in cost savings. Additionally, their ease of maintenance and reusability contribute to long-term cost-effectiveness.
Lap joint pipe flanges assemblies are versatile and applicable in a wide range of uses across various industries. They are suitable for systems with frequent maintenance requirements, as well as for applications where alignment flexibility and ease of disassembly are essential.
Lap Joint Fitting Price
The price of lapped joint flanges can vary widely depending on several factors, including the material, size, pressure rating. However, we have our own factory and the most professional production and procurement channels to ensure fair prices and excellent quality.
Lapped Joint Flange Manufacturer
Advanced Science And Technology
All of our lapped flanges are forged. Lap flanges forged offer a myriad of advantages, epitomized by their superior strength, durability, and reliability. Crafted through a high-pressure forging process, these flanges boast a dense and uniform grain structure, ensuring exceptional mechanical properties such as heightened tensile strength, impact resistance, and fatigue endurance, making them well-suited for high-pressure and high-temperature applications.
Additionally, the forging process enables precise dimensional control, minimizing the risk of defects and ensuring tight tolerances, thus facilitating optimal alignment and sealing. Enhanced corrosion resistance, thanks to the use of materials like stainless steel or carbon steel, further solidifies their suitability for corrosive environments. In essence, forged lapped joint flanges stand as the pinnacle of performance and longevity, catering to the stringent demands of critical industrial operations with unmatched reliability.
Strict Inspection
We have quality control during the manufacturing process. All stub end and lap joint flanges undergo strict process inspection at every stage of the production process, from handling raw materials to shipping the finished product. They are visually inspected for compliance with our specifications and inspected and tested in accordance with applicable ASTM, ASME, MSS, DIN, EN, and JIS codes and standards. Upon request, you can also invite an officially certified testing agent to witness the inspection procedure. For your reference, here are several inspection equipment:
Three Elements Analyzer
A three-element analyzer for lap joint pipes encompasses material composition analysis, dimensional analysis, and visual inspection. Material composition analysis verifies the flange’s chemical makeup and mechanical properties to ensure compliance with standards. Dimensional analysis assesses critical dimensions and tolerances to confirm alignment with specifications, including diameter, thickness, and bolt hole spacing.
Visual inspection identifies visible defects, surface irregularities, or manufacturing flaws, ensuring the flange’s integrity and performance. Together, these elements provide a comprehensive assessment of lap joint flanges, ensuring their quality and suitability for industrial applications.
Laboratory Endoscopy
Laboratory endoscopy for flanges lap involves the utilization of advanced endoscopic technology to conduct thorough internal inspections of these critical components. This specialized procedure enables inspectors to visually examine the internal surfaces and welds of lap joint flanges with precision and detail.
Equipped with high-resolution cameras and flexible probes, endoscopes provide real-time imaging of the flange interior, allowing for the detection of defects, corrosion, erosion, or other anomalies that may compromise performance or integrity. Laboratory endoscopy enhances quality assurance efforts by providing non-destructive evaluation capabilities, facilitating comprehensive assessments of flange condition and ensuring adherence to stringent industry standards and specifications.
Rotary Pneumatic Marking Machine
A rotary pneumatic marking machine for lap joint pipe flanges is a specialized tool designed to efficiently and accurately engrave markings onto flange surfaces. This machine operates using pneumatic power and features a rotary mechanism that allows for precise positioning and marking around the circumference of the flange.
Equipped with customizable marking heads and adjustable parameters, the machine can create clear and legible markings, such as identification numbers, logos, or specifications, on various materials and surface finishes. Its pneumatic operation ensures consistent marking depth and quality, while the rotary capability enables efficient marking of flanges without the need for manual repositioning. Overall, the rotary pneumatic marking machine enhances productivity and traceability in flange manufacturing and identification processes, ensuring compliance with industry standards and specifications.
Customized On Demand
Our lap joint fittings can be customized on demand including construction, electric power, petroleum, chemical industry, pipelines, etc.
Pack And Deliver On Time
Our factory will complete production as soon as possible and deliver lapped joint flanges on time according to your order, ensuring that your receiving is not delayed.
After-Sales Guarantee
To protect your consumer rights and lapped joint flanges quality, we have a professional team to solve your after-sales issues.
We Elite Piping Manufacture Co., Ltd. stands as a prominent leader in the manufacturing sector, specializing in premium-quality piping solutions for diverse industrial applications. Renowned for its unwavering commitment to innovation, precision engineering, and customer satisfaction, Elite Piping delivers a comprehensive array of products, including flanges, fittings, valves, and bespoke fabrications, meticulously crafted to meet the exacting requirements of clients worldwide.
With cutting-edge manufacturing facilities, rigorous quality control measures, and a team of seasoned professionals, Elite Piping ensures the highest standards of reliability, performance, and adherence to global industry standards. Committed to fostering enduring partnerships and exceeding customer expectations, Elite Piping is synonymous with excellence and integrity in the realm of piping manufacturing.
GET IN TOUCH
Company:
bazhou elite s
d manufacture co.,ltd.
Factory Address：
Office # 805, Building No. 6 Poly Metropolitan, Yongshum Town, Tongzhou District, Beijing, China.
Contact Person：
Thomas
Contact Numbers：
+86 88888888888
Email:
sales@ematal.com
