A pipe flange that is welded to the pipe at the lap joint is known as a lap joint flange. This makes it simple to inspect and clean the interior of the pipe. When welding is not necessary, lap joint flanges are frequently used in low-pressure applications.
Because they are less expensive than other kinds of pipe flanges, lap joint flanges are a viable option for projects with limited budgets. Buy them today from lap joint flanges exporters in Gujarat at an affordable rate.
Continue reading, to know more about lap joint flanges features and their benefits.
What is a Lap Joint Flange?
A two-piece device known as a lap joint flange is made up of a stub end that is covered by a lap-joint ring flange. The stub end is often welded to the pipe before the flange ring is applied to line it with the mating flange.
As a result of their ability to be "lapped," or slipped over the end of a pipe, before welding, lap joint flanges are also frequently referred to as "loose" or "lapping" flanges. Working with large-diameter pipes benefits greatly from this because it makes welding alignment simple.
Generally speaking, the applied size and pressure classes of the lap joint flange and weld neck flange are comparable.
Lap Joint Flanges: Are They Flat?
In reality, the flanges used for lap joints have a little radius at the flange bore rather than being flat. The radius is typically around 3/16′′, however, it might change depending on the pipe's size and schedule. This radius's function is to enable a seamless transition from the pipe's flat surface to the flange. By doing so, you lower the weld's tension and help keep it from splitting.
The lap joint flange's flat face has a smooth surface. However, the sealing face that results when the stub end and lap joint flange are connected is elevated. To enable a ring-type junction, the sealing face of a stub end may be plain, serrated, or grooved.
Physical Features
The flange features a little shoulder on the backside that is square-cut in the middle or pipe hole. Also, The back face of the stub end has a filleted back face, while the front side has a flat face with a filleted (rounded) centre hole. Here, the stub end will firmly encircle the flange's central hole.
The stub End:
1. Having a weld bevel on one end, shaped like a brief piece of pipe. The sleeve is another name for this area of the stub end.
2. The hub is the small shoulder on the flange-facing end. The hub and sleeve are connected by a rounded transition on the back face of the hub.
Benefits of Lap Joint Flanges
The lap joint flange generally has the following benefits:
1. Used when the piping system must be frequently assembled
When the piping system must be regularly assembled and disassembled, a lap joint flange is intended to be employed. The primary benefit of this kind of flange is that it can "swivel" around the pipes and stub end, allowing it to be utilised even if the bolt holes on the two flanges are not lined up.
For applications where the piping system needs to be routinely assessed or maintained, this makes it suitable. This will never be an issue with a lap joint flange as opposed to a weld neck flange because alignment is not required during assembly.
However, before welding, a weld neck flange must be positioned in line with the welding site. If not, the uneven loading would cause breaks or cracks in the area around the welding neck.
Lap joint flanges exporters in Gujarat supply lap joint flanges for many applications. As they are frequently simpler to install than other flanges.
2. Useful in corrosive and explosive environments
The ability to employ a lap joint flange in corrosive settings where flammable and explosive circumstances are prohibited is another benefit of doing so. Weld neck flanges are not an option in this situation; blind or thread types must be used instead.
However, those connections would have flaws like inadequate sealing or be difficult to install and disassemble. The lap joint flange is simpler to handle and may offer effective sealing at a reasonable cost. The fact that the backing flange and the stub end of the lap joint flange are distinct also allows us to utilise two different materials for the two parts, increasing their flexibility.
3. Be used in low-pressure applications
Finally, even when constructed with the same size and material grade, lap joint flanges typically have lower pressure ratings than weld neck or threaded varieties. Therefore, you might think about employing a lap joint flange, which can provide both economy and safety conditions, when your piping system only needs a tiny bore and wall thickness.
Application of Lap Joint Flanges
The lap joint flanges offered by Lap joint flanges exporters in Gujarat have the following application:
● Economy
A lap joint flange offers a cost-saving option when piping systems demand a high-priced alloy for all "wetted" sections to prevent corrosion because it is constructed of two pieces. Only the stub-end needs to be manufactured of the more expensive corrosion-resistant material in this case; the flange itself can be made of less expensive steel.
●Ease of Work
Work can be made easier when a plant's functioning necessitates frequent and quick disassembly and installation by using lap joint flanges. The backing flange's ability to spin makes up for misaligned bolt holes during assembly.
Conclusion
In a nutshell, a pipe flange known as a lap joint flange is used when disassembling and reassembling is necessary. Additionally, it is employed if regular piping inside examination is required.
The body flange and the stub end are the two components that make up the lap joint flange. The pipe may be swiftly and simply disassembled for examination or repairs thanks to its design. The most typical application for lap joint flanges is low-pressure equipment like HVAC systems. In-process pipework is one example of a high-pressure application where they can be used.
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