Introduction

Do you know about “long radius elbows”? Where are they used? What are the requirements for size, wall thickness and standards? Below I will give you a detailed introduction with these questions.

Long radius elbows are mainly used in pipes and are a type of pipe fittings. Its curvature has three regular degrees of 45°, 90° and 180°, and there are also customized ones such as 15° and 30°. It is mainly used to change the flow direction in the pipeline. The long radius is 1.5 degrees of the nominal diameter of the conventional elbow. It can ensure smoother flow of objects in the pipeline and reduce pressure.

Let’s take a closer look at the size, use, and difference between long radius elbows and short radius elbows.

What are the dimensions of long radius elbows?

The dimensions mainly depend on the nominal diameter, angle and radius of the pipe

1. Radius: Long radius elbows refer to elbows whose curvature radius is generally 1.5 times the nominal diameter of the pipe.
2. Angle: mainly 45°, 90°, 180° and customized angle 30°.
3. End connection: mainly welding, socket welding and threading.

For example:

When the nominal diameter of the pipe DN is 100mm, the curvature radius of the long radius elbow R = 1.5×100 = 150mm

2-inch long radius elbow, angle is 90°, the distance from the center to the end is 3 inches (1.5 x 2 inches).

1. The radius of the 6-inch elbow is 9 inches.

Why use long radius elbows?

• Reduce pressure: Long radius elbows can slow down the flow rate at the bend.
• Enhance durability: The gentle flow rate can reduce the impact force at the bend of the elbow, so that it can be used for a longer time.
• Improve efficiency: In a high-speed liquid pipeline, reduce the impact at the bend and make it flow smoothly. From the surface, it will not cause flow interruption.

Therefore, in most cases, long radius elbows are preferred.

Application of long-radius elbows

• Oil and gas industry: Durability makes it unnecessary to replace elbows frequently.
• Chemical plants: Reduce impact at bends and are more resistant to corrosion and high temperatures.
• Water treatment systems: Ensure the normal flow of water in large water treatment pipelines.

What is the difference between long radius elbows and short radius elbows?

Radius: The nominal size of long radius elbows is 1.5 times that of short radius elbows.

Flow efficiency: Long radius elbows have a smoother flow rate and lower pressure.

Application: Long radius elbows are used in pipelines with high flow rates, and short radius elbows are used for low pressure.

Conclusion

Long radius elbows are widely used and can be used in various high-pressure and low-pressure pipelines, including but not limited to oil, natural gas and water treatment.

The specific selection requires engineers and designers to choose according to the specific pipeline requirements. If you have more professional questions, please contact us.