Introduction

A slip-on flange is one of many flanges and is a fitting for connecting pipes. In what cases do you need to choose this flange for connection? This requires engineers to design. This article will introduce some relevant knowledge about slip-on flanges. I hope that both newcomers in the industrial industry and engineers with relevant work experience can get some new insights from this article.
This article will introduce the characteristics, advantages, disadvantages, and use environment of slip-on flanges.

What is a slip-on flange?

A slip-on flange is a type of pipe flange. When welding, the slip-on sleeve needs to be fixed on the pipe first. This type of flange is usually used in low-pressure environments and is relatively cheap. When welding, the pipe and the slip-on sleeve are internally welded, which is a more secure way of welding.

Features of slip-on flanges:

1. Design: The hub of the slip-on flange allows the flange to slide over the pipe, making the welding more secure.

2. Welding: The flange slides to the appropriate position for external welding, which can make the welding more secure.

3. Often efficient: Compared with other flanges, slip-on flanges are more cost-effective in low-pressure environments.

When to use slip-on flanges?

Slip-on flanges are usually used in the following aspects:

1. Low-pressure applications

Slip-on flanges are usually used in low-pressure systems, and their maximum pressure resistance varies slightly depending on the material and specifications. They are usually used for some cold water pipes, fire water pipes, and low-pressure gas or oil pipelines. Because these pipes have lower pressure and are not prone to leakage.

2. Frequent disassembly and assembly

In piping systems that require regular disassembly and maintenance, slip-on flanges are a better choice. Because their design makes disassembly easier.

3. Systems with thermal expansion or contraction

In piping systems that may expand or contract thermally, the installation of the slip-on flange is to slide on the pipe, so minor changes within the allowable range will not cause the flange to move or offset.

4. Easy to install

Compared with other flanges, this flange is relatively simple to install. It is also easier to align the pipe during welding. And the requirements for welding technology are also lower than those for butt welding flanges.

Advantages of using slip-on flanges

1. Frequently efficient

Compared with other flanges (such as weld neck flanges or blind flanges), slip-on flanges are more affordable. And the installation is also relatively simple. It is a better choice within a limited budget.

2. Simple installation
The sliding design makes it easier to install and easier to align when the sleeve is on the pipe. Welding is also simpler, which reduces labor time and cost.

3. Versatility in low-pressure systems
In low-pressure piping systems, it can be used in various water treatment systems, gas pipelines, oil pipelines, etc.

4. Reduce the risk of leakage
It is not easy to leak after welding because it is slipped on the pipe, so the welding is safer and more secure.

Disadvantages of sliding flanges

1. Limited strength

Sliding flanges are suitable for low-pressure systems because they are not strong enough. They are prone to leakage in high-pressure piping systems.

2. Welding defects may occur

Since it requires internal and external welding, if the welding technology is too poor, it is easy to weld excessively on both sides. This will cause welding holes and leaks.

3. Not suitable for high pressure

This flange is designed for low-pressure piping systems. Its maximum pressure resistance is 600PSI. Therefore, this flange is not recommended for high-pressure systems.

How to choose the right flange for your system

When choosing whether to use a sliding flange or other flanges, pay attention to the following 4 points

1. Pressure requirements

If it is a high-pressure piping system, it is not recommended to use a sliding flange. Because sliding flanges are mainly designed for low-pressure systems. High-pressure systems are more recommended to use welded flanges with higher strength and durability.

2. Fluid type

Sliding flanges are more suitable for low-pressure non-corrosive fluids. If the fluid you need to transport is corrosive, you may need to choose a flange with higher pressure and more corrosion resistance.

3. Installation and maintenance

In places where frequent disassembly and maintenance are required, it is advantageous to choose a sliding flange. Because it is easy to install and disassemble. Where disassembly is not required, it is recommended to use a more robust welded flange.

4. Cost and budget

In low-pressure systems, the cost of sliding flanges is more affordable than other flanges. If you have a limited budget, it is recommended to choose this flange.

Summary

Some basic knowledge of sliding flanges has been introduced above. It includes characteristics, applications, advantages and disadvantages, etc. Here, only the strength point is that this flange is only suitable for low-pressure systems, such as cooling water pipes and low-pressure gas pipes. In high-pressure systems, other flanges need to be selected for connection.