Aside from welding, flange welds are the second most often utilized means of connecting pipe systems to different equipment, valves, and other components of nearly any processing system.
Allowing for quicker disassembly and better access to system components is facilitated by the use of flanges in pipe systems.
If you’re new to flange weld design, this guide will provide you with a good grounding in its fundamentals.
Neck Flange Welding
A welding neck flange features a unique long tapered hub to enhance the union’s strength. However, while working under high pressure or at temperatures below zero, the joint will be put under a great deal of stress.
Flanges with taper are used to make the transition between pipe and fitting wall thicknesses easier. If the lines grow or other fluctuating pressures cause recurrent bending, this tool is important to have on hand.
In addition to reducing joint erosion and joint stress, the inner bore of these flanges, which is matched to the ID of the mating pipe or fitting, also has this effect. Turbulence is avoided at the junction because the flow is unrestrained. As a consequence of this method, erosion is reduced.
Radiographs are excellent for detecting defects in neck flange welding.
One full penetration V weld (Butt-weld) is all that is needed to join this flange type to a pipe or fitting (Tapered hub or high hub flanges).
There is also the long weld neck flange, which looks like the ordinary weld neck flange but is longer. It may be used in a variety of ways, including a barrel or column.
Slip-On flange
In terms of durability, slip-on flanges are inferior to neck flanges. This means that its predicted strength under internal pressure and life expectancy is significantly reduced.
Low-pressure applications where leaking isn’t a big issue might benefit from affordable and easy-to-install slip-on flanges.
Slip-on flanges have the added advantage of not necessitating a substantial amount of line longitudinal space to be placed.
Additionally, they are simpler to align thanks to the availability of a large variety of pipe diameters, and they do not require precision pipe cutting.
The connection to the pipe must be double-welded if there is no neck on which to rest it. Two filet welds are used on both the outside and inside of the flange.
The slide-on flange has the disadvantage of requiring both the pipe and the fitting to be welded before it can be put into use.
In order to employ flange and elbow or elbow/tee combinations, the straight end of the flange is required.
Use in high-pressure or hazardous material applications is not advised.
Socket Weld Flange
Socket Weld flanges were originally developed for high-pressure, small-diameter pipe systems.
It has the same static strength and fatigue strength as slip-on flanges, but it is 50 percent stronger than double-welded slip-on flanges in this regard.
Before arc or MIG welding, the flange or fitting must be separated from the pipe by at least 1/16′′ to 1/8′′.
By reducing the residual stress and enabling the pipe to expand on the inner side of the weld, this method keeps the fitting’s weld from cracking.
Flanges and pipes are connected by a single fillet weld that is visible from the outside.
Per ASME B31.1 1998 127.3, the pipe or tube must be inserted to its greatest length into the socket before welding. It’s time to get ready for welding! (E). After that, it’s taken out of the socket by about 1/16″ (1.6 mm) from the pipe’s end and disposed of.
Because the weld is on the exterior of the pipe, socket weld flanges are less likely to damage the pipe’s inside.
Threaded flange leakage is significantly minimized because of the lack of bevel prep required for socket weld flanges before welding.
This flange’s drawbacks include its need for a gap to be constructed.
- Welders with specialized training and welding machines with advanced control, such as Dekopro dual-voltawge welder, are needed to guarantee that the 1/16′′ gap is achieved.
- The second reason is that the expansion gap encourages cracking, particularly in anti-corrosive pipes like those made of stainless steel.
- Cracks between the pipe and the flange will lead to corrosion, which will need more maintenance.
- This flange is also prohibited in several procedures.
Lap Joint Flange
Lap joints have many similarities to other flanges; however, they do not have raised faces.
- They are joined together by a “Lap Joint Stub End.”
- These flanges resemble Slip-On flanges except in that the bore has a curved radius.
- Because of their flanged ends, stub ends are meant to be slid over the pipe.
- In order to allow the lap joint flange to move freely, the pipe’s stub end is then welded to the pipe.
Thus, they are suitable for low-stress circumstances.
Lap joint flanges provide a variety of advantages.
- The pipe may rotate freely around the flanges while dismantling for inspection and cleaning, making it simpler to align the opposing flange bolt holes.
- Because they are not in contact with the fluid, carbon steel flanges and corrosion-resistant pipes may be utilized, which might save a lot of money in the long run.
- Flanges may be saved from systems that are quickly degrading or corroding and repurposed.
Stub End
As a backing flange for lap joints, Stub Ends are often employed. However, they may also be used for slip-on applications.
There are stub ends available for purchase in most pipe diameters. The three choices are A, B, and C.
- The support flange for the lap joint may be machined to fit Type A
- In the case of Type B, a normal slide-on flange is needed
- Whereas Type C may make use of lap or slip joints
Size and tolerance requirements are specified in the ASME B16.6-9 standard. All Stub Ends must meet MSS SP43 specifications.
Threaded Flange
As a result, no welding is required in order to attach the pipe to its threaded flange.
This is accomplished by the use of corresponding threads.
- Using a seal weld in conjunction with the flange’s threaded connection isn’t always essential.
- Threaded fittings are still available in a broad variety of diameters and pressure ratings for use in smaller pipe sizes up to 4.00′′.
- In situations where the thickness of the wall is critical, a threaded flange or fitting is suitable because of the thread.
- Small wall thicknesses make threading difficult.
Threaded steel pipe used in steam or water systems with pressures more than 100 psi and temperatures greater than 220°F must be seamless and meet the requirements of ASME B36.10 schedule 80.
The two pipe ends may be sealed with a lens pad and sealing surface in addition to the two types of threaded flanges.
A threaded flange is mostly used in the production of ammonia.
Conclusion
Flange weld dimensions are more important than a flange’s functional design when it comes to influencing a pipe system’s construction, maintenance, or upgrade.
However, you must take into account how the flange is attached to the pipe and the gaskets used to guarantee adequate size.
One style of flange weld does not meet all situations. Choosing the right flange design for your pipe system and intended use can assure dependable operation, a long service life, and the most cost-effective option.
Pipe Pro Metal Cutting Guide Kit - (Includes Sizes: 1-7/8", 2-3/8", 2-7/8")
Product DescriptionCountry of origin: China
No batteries required
Product Details| Brand: | Pipe Pro Guide |
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| Model #: | 1 |
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| Dimensions: | 4.5 X 4.5 X 4 inches (Length X Width X Height) |
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| Price: | $30.22 |
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Pipe Pro Metal Cutting Guide Kit - (Includes Sizes: 1-7/8", 2-3/8", 2-7/8")
Drkerr 6Piece Magnetic Metal Pipe Cutting Guide Kit - (Includes Sizes: 1-5/8" 1-7/8" 2-3/8" 2-7/8" 3-1/2" 4-1/2"), Guides Cuts at 45°, 90°, 22.5° and Saddle Cut, Pipe Marking Tool, Steel
Product DescriptionWide Cutting Range: Magnetic metal pipe cutting guide kit included - (1-5/8" Guide, 1-7/8" Guide, 2-3/8" Guide, 2-7/8" Guide, 3-1/2" Guide, 4-1/2" Guide). Versatile Cutting Angles: Cuts at 45°, 90°, 22.5°, and saddle cut. Magnetic steel metal construction
PRECISION CUTTING: The Steel Pipe Cutting Guide Kit saves time and money by marking cuts on the pipe, ensuring neat cut ends for subsequent welding or joining work, minimizing cutting errors, and ensuring that the cut surface is flat, smooth, and the dimensions meet the requirements
Excellent Material: Metal Cutting Guide Kit Size and Weight-Yellow：6.29in*4.72in；1.52 lb, Violet：4.72in*3.54in；0.88 lb, Blue：4.33in*2.95in；0.70 lb, Red：3.54in*2.36in；0.52 lb, Orange：2.95in*1.96in；0.35 lb, Green：2.95in*1.77in；0.30 lb. Small pipe angle marking tool is made of sturdy materials that can withstand external forces and friction during the cutting process, making it easy to use
Easy To Use: 1. Place the appropriate size metal pipe cutting track kit on the metal pipe.2. Use a marker to draw the route and arc to be cut along the grooves of the Cutting Track Kit.3. Use the cutter tool to cut along the drawn line and remove the cut section with a hammer when finished.4. Presentation of results. You will get a perfect new pipe. Note: Please wear gloves before work and pay attention to safety
Why Choose Us?: 6Piece Magnetic Metal Pipe Cutting Guide Kit use on fencing, corrals, handrails, race cars, and more. Whether you're tackling a home improvement project, plumbing tasks, or intricate custom builds, this versatile toolkit is your ultimate companion. Each guide is crafted from lightweight yet resilient steel, ensuring longevity and reliability. This commitment not only reflects our confidence in the quality of our products, but also makes you feel more at ease in the process of purchase and use
Product Details| Brand: | Drkerr |
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| Model #: | DRK-0413PCG |
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| Color: | Yellow, Purple, Blue, Red, Orange, Green |
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| Dimensions: | 7.08 X 5.12 X 5.12 Inches (Length X Width X Height) |
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| Price: | $98.27 (Save 5%) |
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Drkerr 6Piece Magnetic Metal Pipe Cutting Guide Kit - (Includes Sizes: 1-5/8" 1-7/8" 2-3/8" 2-7/8" 3-1/2" 4-1/2"), Guides Cuts at 45°, 90°, 22.5° and Saddle Cut, Pipe Marking Tool, Steel
Mercer Industries 730030 Pipe Marking & Cutting Guide 2 3/8"
Product DescriptionFour pipe marking tools in 1, now one tool for all your marking tasks. Saddle cut, 45 degrees, 22-1/2 Degree and 90 Degree.
Spring loaded hinge keeps guide secure on pipe
Accurate angle slots create precise markings for professional results
Crafted from 16 GA. Epoxy coated steel for durability and strength
Reusable over and over again
Product Details| Brand: | Mercer Industries |
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| Model #: | 730030 |
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| Warranty: | 90 day warranty against manufacturer defects |
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| Size: | 2 3/8" |
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| Dimensions: | 4.5 X 2.375 X 2.375 Inches (Length X Width X Height) |
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| Price: | $21.20 |
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Mercer Industries 730030 Pipe Marking & Cutting Guide 2 3/8"
SANGIFT Metal Pipe Cutting Guide Kit, Pipe Cutting Guide Tool, Pipe Saddle Template Cutting Guide, High-Precision Cross｜Saddle Cuts at 22.5°, 45°, 90°, 3 Pack Size 1-7/8", 2-3/8", 2-7/8"
Product Description[Achieve Perfect Cuts Every Time – Effortlessly] Effortlessly mark precise 22.5°, 45°, 90°, and professional saddle cuts on metal pipes. Our magnetic pipe cutting guide ensures straight, clean cuts that fit perfectly for seamless welding or connections, eliminating frustrating errors and rework
[Perfect Fit for Common Pipes - 3 Sizes Included] This magnetic metal pipe cutting guide kit covers the essential sizes you need: 1-7/8", 2-3/8", and 2-7/8" pipe saddle guide. One metal cutting guide kit handles a wide range of standard pipe cutting tasks in plumbing, fencing, handrails, and industrial projects
[Powerful Magnetic Liner - Stays Put!] The pipe notch guide integrated strong magnetic liner grips firmly onto the pipe surface, preventing any shifting or slipping during marking. Even in awkward positions, enjoy stable, consistent lines for unparalleled cutting accuracy
[Tough Steel, Premium Build] Crafted from durable, high-grade steel, this metal pipe cutting jig withstands the rigors of the job site. pipe cutting saddle's rugged construction resists wear, deformation, and damage, guaranteeing reliable performance and long-term value
[Save Time & Boost Efficiency - Simple 3-Step Use] (1) Attach the correct pipe guide saddle size. (2) Mark your cutting line along the groove. (3) Cut! Designed for ultimate user-friendliness, pipe saddle cutting guide speeds up your workflow dramatically, whether you're a pro or a DIY enthusiast tackling home improvements, repairs, or custom fabrication
Product Details| Brand: | SANGIFT |
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| Model #: | Magnetic Metal Pipe Cutting Guide Kit |
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| Color: | Blue, Red, Orange |
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| Price: | $29.09 ($9.70 / Count) |
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SANGIFT Metal Pipe Cutting Guide Kit, Pipe Cutting Guide Tool, Pipe Saddle Template Cutting Guide, High-Precision Cross｜Saddle Cuts at 22.5°, 45°, 90°, 3 Pack Size 1-7/8", 2-3/8", 2-7/8"
NationWide Products-Pipe Pro 6Piece Magnetic Metal Pipe Cutting Guide Kit, Steel
Product DescriptionIncludes (1) 1-5/8" Guide, (1) 1-7/8" Guide, (1) 2-3/8, (1) 2-7/8, (1) 3-1/2, (1) 4-1/2
Cuts at 45°, 90°, 22.5°, and saddle cut
Lightweight yet durable metal construction
Magnetic., flexible "forever hinge"
Product Details| Brand: | NationWide Products-Pipe Pro |
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| Model #: | 1-5/8, 1-7/8, 2-3/8, 2-7/8, 3-1/2, 4-1/2 |
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| Color: | Multicolor |
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| Price: | $99.95 |
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NationWide Products-Pipe Pro 6Piece Magnetic Metal Pipe Cutting Guide Kit, Steel
Sawyer Mfg Company - Pipefitter's Handbook (Yellow Book) - Comprehensive Guide for Pipe Dimensions, Welding Specs & Fittings - Durable Reference for Field & Workshop
$9.00
@ Amazon.com (Save 17%)
Product DescriptionProduct Details| Brand: | |
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| Dimensions: | 7 X 4.25 X 0.5 Inches (Length X Width X Height) |
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| Price: | $9.00 (Save 17%) |
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Sawyer Mfg Company - Pipefitter's Handbook (Yellow Book) - Comprehensive Guide for Pipe Dimensions, Welding Specs & Fittings - Durable Reference for Field & Workshop
Sthovd Metal Cutting Guide Kit Includes Sizes: 1-7/8", 2-3/8", 2-7/8" Pipe Cutting Guide Cuts at 45°, 90°, 22.5°, and Saddle Cut, Steel-3Pcs
Product DescriptionWidely Applicable: The pipe cutting guide includes three sizes: 1-7/8"、2-3/8" and 2-7/8 ". The cutting of 22.5 °,45 °,90 °and saddle cut can meet the cutting needs of different pipe diameters and are suitable for pipeline installation, maintenance, and other fields
Precise Cutting: Using a metal cutting guide kit can ensure that the cut ends are neat, facilitating subsequent welding or connection work, reducing cutting errors, ensuring that the cutting surface is flat, smooth, and the size meets the requirements
Excellent Material: Pipe saddle cutting guide is made of sturdy materials that can withstand external forces and friction during the cutting process, making it easy to use
Easy to Use and Efficient: Pipe saddle template designed to be simple and user-friendly. Simply wrap the conduit around the pipe, mark along the conduit, and then remove the conduit for cutting, saving time and energy and improving work efficiency
After-Sale Service: If there is any dissatisfaction with the received goods, please take it easy . We will show you our sincere attitude and satisfactory solutions as soon as possible
Product Details| Brand: | Sthovd |
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| Model #: | Metal Cutting Guide Kit |
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| Price: | $28.69 (Save 5%) |
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Sthovd Metal Cutting Guide Kit Includes Sizes: 1-7/8", 2-3/8", 2-7/8" Pipe Cutting Guide Cuts at 45°, 90°, 22.5°, and Saddle Cut, Steel-3Pcs
ZhouDaShu Pipe Pro Metal Cutting Guide Kit, Pipes Saddle Template for Angle Cuts, Magnetic Pipe Coping/Notching Tool Includes Sizes:1-7/8", 2-3/8", 2-7/8", Precision Cuts at 22.5°, 45°, 90°-3 PCS
Product DescriptionPrecision Cutting: This pipe pro metal cutting guide is designed for pipe cutting, with sizes including 1-7/8", 2 - 3/8", 2 - 7/8", pipe cutting guide can easily mark the cut on the pipe, ensuring a smooth and flat cut surface, pipe angle cutter is convenient for tight fit in subsequent welding or connection work, minimizing cutting errors and providing you with a perfect pipe saddle cutting.
High-quality Materials: The pipe marking tool is made of high-quality steel. Pipe coping tool is not easy to deform and damage when subjected to external forces and friction during the cutting process, and can support long-term and high-intensity cutting operations.
The pipe coping tool is also equipped with a strong magnetic component. These pipe notcher tools has strong magnetic adsorption. Even in a complex working environment, pipe cutting jig can be firmly adsorbed on the surface of the metal pipe during cutting, ensuring the consistency and safety of the cutting. Pipe notcher tool is your trusted long-term partner.
Easy to Use: Our pipe saddle template is very simple to use. Among the three sizes, choose the appropriate size of pipe saddle cutting guide and place it on the metal pipe. Use a marker to mark the required cutting route along the conduit groove. After taking out the conduit, use the cutting tool to cut along the drawn line.
Wide Application: This metal pipe template for saddle cuts is widely used, suitable for fences, handrails, fence pipes, industrial pipe installation and maintenance, home pipe modification, DIY project needs and other scenes involving magnetic metal pipes. pipe welding tools has excellent performance, achieves your expected results, and makes work easy.
Service Guarantee: Please make sure precision pipe saddle template cutting guide is suitable for your pipe size before ordering. If you find any defects or damages, please feel free to contact us and we will solve your problem within 24 hours.
Product Details| Brand: | ZhouDaShu |
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| Model #: | Pipe Cutting Guide Kit |
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| Price: | $29.99 |
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ZhouDaShu Pipe Pro Metal Cutting Guide Kit, Pipes Saddle Template for Angle Cuts, Magnetic Pipe Coping/Notching Tool Includes Sizes:1-7/8", 2-3/8", 2-7/8", Precision Cuts at 22.5°, 45°, 90°-3 PCS
GSParts 6 Piece PIPE-PRO Magnetic Metal Pipe Cutting Guide Kit, Steel
Product DescriptionMPN: 1-5/8, 1-7/8, 2-3/8, 2-7/8, 3-1/2, 4-1/2, MEKIT
Brand: Nation Wide Products, Pipe-Pro Guides
Cuts at 45°, 90°, 22.5°, and saddle cut
Lightweight yet durable metal construction
Use on fencing, corrals, handrails, race cars, and more
Product Details| Brand: | GSParts |
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| Model #: | 1-5/8, 1-7/8, 2-3/8, 2-7/8, 3-1/2, 4-1/2 |
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| Price: | $109.99 |
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GSParts 6 Piece PIPE-PRO Magnetic Metal Pipe Cutting Guide Kit, Steel
Precision Pipe Saddle Template Cutting Guide, 2025 New Plumbing Pipe Insulation Cutting Kit for Welding and Installation, Accurate Arc Edge Contour Cut Guides for DIY Users (10pcs, DN20mm - DN200mm)
Product Description【Accurate Arc Contour Marking】Achieve precise pipe marking every time with this arc contour template. Designed for accurate saddle cutting and miter pipe guide applications, it helps eliminate guesswork for professionals and DIY users handling metal pipe cutting and installation.
【Time-Saving Pipe Cutting Guide】Speed up complex pipe insulation cutting and layout tasks with this plumbing pipe guide. The one-hand operation allows quick marking and preparation for welding or installation, making it efficient for multiple pipe projects in minutes.
【Multi-Size & Material Compatibility】Compatible with metal, PVC, and plastic pipes ranging from 20mm to 200mm, this flexible pipe cutting template tool supports various pipe sizes and materials. Simplify your toolkit by using this precision pipe tool for all your pipe marking needs.
【User-Friendly for All Skill Levels】The pipe template offers an intuitive interface, making miter joint marking and saddle cutting straightforward for both experienced professionals and DIY beginners. Easily achieve accurate pipe saddle fitting and layout, reducing errors during installation.
【Durable Construction for Daily Use】Crafted from robust artificial leather, this pipe insulation cutting guide withstands frequent field use. Lightweight yet sturdy, it ensures reliability for every plumber or welder, making it an essential pipe fitting miter cutting template for any toolkit.
Product Details| Brand: | Rewdut |
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| Model #: | Pipe Cutters |
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| Color: | 10pcs, Dn20mm - Dn200mm |
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| Price: | $11.98 |
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Precision Pipe Saddle Template Cutting Guide, 2025 New Plumbing Pipe Insulation Cutting Kit for Welding and Installation, Accurate Arc Edge Contour Cut Guides for DIY Users (10pcs, DN20mm - DN200mm)
