If you want to join two pipes, you have a few options. One type of pipe joint is the slip-on flange, and the other is the lap joint flange. Both flanges have advantages and disadvantages, so you must understand which one you should use for your project before deciding. Let’s take a look at each type of flange in more detail.
A slip-on flange is made from two pieces of metal that are joined together with a welding process called “slip-on welding”. This method creates an even, uniform weld between the two pieces of metal. The advantage of this type of flange is that it can handle higher pressure ratings than other types of pipe joints. However, it does require more labour and has limited flexibility when it comes to installation. In addition, if used in specific applications, such as fire safety systems or gas lines, they may need to be inspected regularly due to potential corrosion issues.
Lap Joint Flange
A lap joint flange is also composed of two pieces but instead uses interlocking grooves that form a tight seal between them. The advantage of this type of joint is that it allows for easy installation and maintenance since no welding or special tools are needed for assembly. It also offers greater flexibility in design because the connection can be adjusted depending on the size and shape of the connected pipes. However, it does not offer as much pressure tolerance as slip-on flanges do and may require additional support to maintain stability if used in high-pressure applications.
Difference Between Slip-on Flanges and Lap Joint Flanges
- A slip-on flange is a type of flange welded to the pipe and has a lip extending beyond the pipe’s edge. A lap joint flange is a type of flange that is not welded to the pipe and has a lip that does not extend beyond the edge of the pipe.
- Slip-on flanges are easier to install than lap joint flanges because they do not require welding. Lap joint flanges are more difficult to install because they require welding.
- Slip-on flanges are less expensive than lap joint flanges because they do not require welding. Lap joint flanges are more costly because they require welding.
- Slip-on flanges are more likely to leak than lap joint flanges because the lip extends beyond the edge of the pipe. Lap joint flanges are less likely to leak because the lip does not extend beyond the edge of the pipe.
- Slip-on flanges are less strong than lap joint flanges because they are welded to the pipe. Lap joint flanges are stronger because they are not welded to the pipe.
- Purpose: Slip-on flanges are used to connect pipes to flanges, while Lap joint flanges are used to provide easy access for piping inspection and cleaning.
- Design: Slip-on flanges have a bore that matches the inner diameter of the pipe, while Lap joint flanges have a circular stub end that fits into a matching lap joint stub end.
- Installation: Slip-on flanges are easy to install and can be installed from one side of a piping system, while Lap joint flanges require a lap joint stub end to be welded to the pipe first.
- Strength: Slip-on flanges are weaker than Lap joint flanges and rely on fillet welds for strength. Lap joint flanges are stronger as they are connected to a stub end that is welded to the pipe.
- Cost: Slip-on flanges are less expensive than Lap joint flanges.
Understanding the differences between slip-on flanges and lap joint flanges will help you choose the best option for your application or project needs. Slip-on flanges are better suited for high-pressure applications, while lap joint flanges offer more flexibility in terms of design and installation. Ultimately, choosing between these two types will depend on your specific requirements and budget considerations, so make sure to do your research before making a decision!
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