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Flange jointing system

About Rendifield flange jointing system

RENDIFIELD MINING AND INDUSTRIAL PIPING SOLUTIONS Flanges supplied by Rendifield become reliable workhorse partners to any suburbian or urban challenge with regards to HDPE installation and pipe maintenance.  Rendifield’s commitment to Excellence in Service will ensure that your project stays on target.

Contact us today for the best service!

What is a flange jointing system?

A flange jointing system is a method used to connect pipes, valves, or equipment together by using flanges, which are flat or raised rims with evenly spaced holes around their circumference. Flanges provide a way to attach and secure different components, allowing for easy assembly, disassembly, and maintenance of piping systems.

Flange jointing systems are widely used in various industries, including oil and gas, chemical, water supply, sewage systems, power generation, and more. They provide flexibility and convenience in managing piping systems, especially when components need to be frequently inspected, repaired, or replaced.

Proper gasket selection, bolt tightening, and flange design are critical for achieving a leak-free and reliable joint. Flange jointing systems should adhere to industry standards and guidelines to ensure safety and integrity in the pipeline.

Flange joints are mostly used in industries where frequent maintenance, inspection, or changes in the pipeline are required.

How does flange jointing systems actually work?

Here’s how a flange jointing system typically works:

  1. Flange Types: There are several types of flanges, including slip-on, weld neck, socket weld, threaded, blind, and lap joint flanges. Each type serves a specific purpose and offers advantages based on the application.
  2. Flange Design: Flanges are usually made from materials such as metal (steel, stainless steel, etc.) or other materials like plastic, depending on the application’s requirements.
  3. Flange Installation:
    • Two pipes, valves, or equipment pieces to be joined are aligned so their openings match up.
    • A gasket made of rubber, fiber, or other suitable material is placed between the facing surfaces of the flanges to create a seal.
  4. Bolting: Bolts are inserted through the holes in the flanges and the gasket. Nuts are then tightened on the other side to secure the flanges tightly together.
  5. Tightening Sequence: Bolts are typically tightened in a specific sequence to ensure even pressure distribution and prevent distortion of the flanges. This helps create a uniform seal and prevents leaks.
  6. Tightening Torque: Bolts are tightened to a specified torque level to achieve the appropriate pressure on the gasket and create a leak-free connection.
  7. Sealing: The gasket creates a seal between the flanges, preventing leakage of fluids or gases from the joint.
  8. Maintenance and Disassembly: Flange joints are relatively easy to disassemble. Loosening the nuts allows for the separation of the components, providing access for maintenance, inspection, or replacement of parts.
Flange jointing system specifications for HDPE pipe systems.

Flange jointing systems for HDPE (High-Density Polyethylene) pipes have some specific considerations due to the unique properties of the material. HDPE is a thermoplastic known for its excellent chemical resistance, durability, and flexibility. When designing and implementing a flange jointing system for HDPE pipes, certain specifications should be taken into account to ensure a reliable and leak-free connection:

  1. Flange Types: Common flange types used with HDPE pipes include lap joint flanges and stub end flanges. These types allow the use of HDPE backing rings, which serve as a connection point for the HDPE pipe and a sealing surface for the gasket.

  2. Backing Rings: HDPE flange joints often require backing rings made of materials compatible with HDPE. These rings are placed behind the flange and provide a smooth surface for the gasket to seal against. They also help distribute the bolt load evenly.

  3. Gaskets: Gaskets used in HDPE flange joints should be selected based on their compatibility with HDPE and the specific fluid being transported. Typically, gaskets made of EPDM (ethylene propylene diene monomer) or similar materials are used due to their chemical resistance and flexibility.

  4. Bolting: Bolts, nuts, and washers used for HDPE flange connections should be made of materials that are compatible with HDPE and can withstand the operating conditions, including potential exposure to chemicals or UV radiation. Stainless steel or other corrosion-resistant materials are commonly used.

  5. Tightening Torque: The tightening torque for bolts in HDPE flange joints should be determined based on the gasket material, flange design, and the specific application requirements. Over-tightening can deform the HDPE pipe and lead to leaks, while under-tightening can result in inadequate sealing.

  6. Flange Design: The design of the flanges and backing rings should ensure a proper fit with the HDPE pipe ends. Smooth surfaces and accurate dimensions are crucial to achieving a reliable seal.

  7. Alignment and Handling: HDPE pipes are relatively flexible, and careful attention must be paid to alignment during installation to avoid stressing the joints. Proper handling practices, including avoiding bending or kinking the pipes, are important to maintain the integrity of the joint.

  8. Installation: HDPE flange joints often require specialized installation equipment, such as electrofusion machines, to ensure proper alignment and fusion of the HDPE pipes to the backing rings.

  9. Environmental Considerations: HDPE pipes and flange jointing systems are known for their resistance to UV radiation and chemicals. However, if the installation will be exposed to direct sunlight, additional measures like UV protection coatings or enclosures might be necessary.

  10. Industry Standards: Adherence to industry standards, guidelines, and manufacturer recommendations is crucial to ensure the successful implementation of HDPE flange jointing systems. Standards such as ASTM F1476 provide guidelines for the design and installation of flange connections for HDPE pipes.

When designing and implementing flange jointing systems for HDPE pipes, it’s important to work with professionals who are knowledgeable about HDPE properties, installation techniques, and industry standards. Properly executed HDPE flange joints can provide reliable and long-lasting connections in various applications.

Flange jointing system dimensions

Physical dimensions should be specified in order to size flanges correctly.

  • Outside diameter (OD) is the distance between two opposing edges of a flange’s face. 
  • Thickness refers to the thickness of the attaching outer rim, and does not include the part of the flange that holds the pipe.
  • Bolt circle diameter is the length from the center of a bolt hole to the center of the opposing hole.
  • Pipe size is a pipe flange’s corresponding pipe size, generally made according to accepted standards. It is usually specified by two non-dimensional numbers, nominal pipe size (NPS) and schedule (SCH).
  • Nominal bore size is the inner diameter of the flange connector. When manufacturing and ordering any type of pipe connector, it is important to match the bore size of the piece with the bore size of the mating pipe.

 

BACKING FLANGES              
T/D HDG OD ID THK PCD NO. HOLES e x 45 KG/PC  
25MM 101.6 38 10 73 4 14.3 4 0.50  
32MM 114.3 45 10 82.6 4 14.3 4 0.63  
40MM 120.7 51 10 87.3 4 14.3 4 0.69  
50MM 133.4 63 10 98.4 4 14.3 4 0.80  
63MM 152.4 78 10 114.3 4 17.5 4 0.98  
75MM 165.1 92 10 127 4 17.5 4 1.09  
90MM 184.1 110 10 146 4 17.5 4 1.27  
110MM 215.9 136 10 177.8 4 17.5 4 1.66  
125MM 215.9 136 10 177.8 4 17.5 4 1.66  
140MM 254 158 12 209.6 8 17.5 6 2.75  
160MM 279.4 190 12 235 8 17.5 6 2.93  
180MM 279.4 190 12 235 8 17.5 6 2.93  
200MM 336.3 237 12 292.1 8 17.5 6 4.04  
225MM 336.3 237 12 292.1 8 17.5 6 4.04  
250MM 406.4 279 16 355.6 8 22.2 8 8.23  
280MM 406.4 292 16 355.6 8 22.2 8 7.51  
315MM 457.2 330 19 406.4 12 22.2 8 11.10  
355MM 527.1 376 22 469.9 12 25.4 8 17.50  
400MM 577.9 430 22 520.7 12 25.4 8 19.20  
450MM 641.4 476 25 584.2 12 25.4 8 27.30  
500MM 704.9 533 28 641.4 16 25.4 8 35.00  
560MM 762 592 28 698 16 28.6 8 37.50  
630MM 825.5 645 30 755.7 16 28.6 8 46.80  
                   
BACKING FLANGES                  
1000/6 HDG                  
110MM 220 136 12 180 8 18 4 2.03  
125MM 220 136 12 180 8 18 4 2.03  
140MM 250 158 14 210 8 18 6 3.02  
160MM 285 190 16 240 8 22 6 4.08  
180MM 285 190 16 240 8 22 6 4.08  
200MM 340 237 18 295 8 22 6 6.17  
225MM 340 237 18 295 8 22 6 6.17  
250MM 395 279 20 350 12 22 8 8.93  
280MM 395 292 20 350 12 22 8 8.02  
315MM 445 330 22 400 12 22 8 11.30  
355MM 505 376 25 460 16 22 8 16.40  
400MM 565 430 25 515 16 26 8 19.10  
450MM 615 476 30 565 20 26 8 25.60  
500MM 670 533 30 620 20 26 8 28.10  
560MM 730 592 35 675 20 26 8 36.50  
630MM 780 645 36 725 20 26 8 39.80  
630MM(2) 835 662 36 780 20 26 8 54.60  
710MM 895 737 40 840 24 26 8 59.70  
800MM 1015 840 45 950 24 33 8 82.90  
900MM 1115 942 50 1050 28 33 8 100.40  
1000MM 1230 1045 55 1160 28 33 8 132.50  
                   
BACKING FLANGES                  
1600/6 HDG                  
25MM 105 38 10 75 4 14 4 0.55  
32MM 115 45 10 85 4 14 4 0.65  
40MM 140 51 10 100 4 18 4 0.97  
50MM 150 63 10 110 4 18 4 1.07  
63MM 165 78 12 125 4 18 4 1.47  
75MM 185 92 12 145 4 18 4 1.82  
90MM 200 110 14 160 8 18 4 2.19  
110MM 220 136 14 180 8 18 4 2.36  
125MM 220 136 14 180 8 18 4 2.36  
140MM 250 158 16 210 8 18 6 3.45  
160MM 285 190 18 240 8 22 6 4.59  
180MM 285 190 18 240 8 22 6 4.59  
200MM 340 237 22 295 12 22 6 7.28  
225MM 340 237 22 295 12 22 6 7.28  
250MM 405 279 25 355 12 26 8 12.05  
280MM 405 292 25 355 12 26 8 10.90  
315MM 460 330 28 410 12 26 8 16.40  
355MM 520 376 30 470 16 26 8 21.90  
400MM 580 430 32 525 16 26 8 27.80  
450MM 640 476 35 585 20 26 8 36.60  
500MM 715 533 40 650 20 33 8 50.70  
560MM 775 592 40 710 20 33 8 56.40  
630MM 840 645 50 770 20 33 8 82.70  
710MM 910 737 50 840 24 33 8 79.90  
800MM 1025 840 60 950 24 39 8 114.30  
900MM 1125 942 65 1050 28 39 8 134.70  
1000MM 1255 1045 70 1170 28 39 8 190.30  
                   
                   
Flange jointing system applications

Pipe flanges are used for dismantling piping systems, temporary or mobile installations, transitions between dissimilar materials, and connections in environments not conducive to solvent cementing.

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